/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2026 Cppcheck team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
#include "check.h"
#include "checkbufferoverrun.h"
#include "ctu.h"
#include "errortypes.h"
#include "helpers.h"
#include "platform.h"
#include "settings.h"
#include "fixture.h"
#include
#include
#include
class TestBufferOverrun : public TestFixture {
public:
TestBufferOverrun() : TestFixture("TestBufferOverrun") {}
private:
/*const*/ Settings settings0 = settingsBuilder().library("std.cfg").severity(Severity::warning).severity(Severity::style).build();
const Settings settings0_i = settingsBuilder(settings0).certainty(Certainty::inconclusive).build();
const Settings settings0_p = settingsBuilder(settings0).severity(Severity::portability).build();
const Settings settings1 = settingsBuilder(settings0).severity(Severity::performance).certainty(Certainty::inconclusive).build();
struct CheckOptions
{
bool cpp = true;
};
#define check(...) check_(__FILE__, __LINE__, __VA_ARGS__)
template
void check_(const char* file, int line, const char (&code)[size], const CheckOptions& options = make_default_obj()) {
check_(file, line, code, settings0_i, options.cpp);
}
template
void check_(const char* file, int line, const char (&code)[size], const Settings& settings, bool cpp = true) {
SimpleTokenizer tokenizer(settings, *this, cpp);
ASSERT_LOC(tokenizer.tokenize(code), file, line);
CheckBufferOverrun check;
runChecks(check, tokenizer, *this);
}
// TODO: get rid of this
void check_(const char* file, int line, const std::string& code) {
// Tokenize..
SimpleTokenizer tokenizer(settings0_i, *this);
ASSERT_LOC(tokenizer.tokenize(code), file, line);
CheckBufferOverrun check;
runChecks(check, tokenizer, *this);
}
#define checkP(...) checkP_(__FILE__, __LINE__, __VA_ARGS__)
template
void checkP_(const char* file, int line, const char (&code)[size])
{
SimpleTokenizer2 tokenizer(settings1, *this, code, "test.cpp");
// Tokenizer..
ASSERT_LOC(tokenizer.simplifyTokens1(""), file, line);
CheckBufferOverrun check;
runChecks(check, tokenizer, *this);
}
void run() override {
mNewTemplate = true;
TEST_CASE(noerr1);
TEST_CASE(noerr2);
TEST_CASE(noerr3);
TEST_CASE(noerr4);
TEST_CASE(sizeof3);
TEST_CASE(array_index_1);
TEST_CASE(array_index_2);
TEST_CASE(array_index_3);
TEST_CASE(array_index_4);
TEST_CASE(array_index_6);
TEST_CASE(array_index_7);
TEST_CASE(array_index_11);
TEST_CASE(array_index_12);
TEST_CASE(array_index_13);
TEST_CASE(array_index_14);
TEST_CASE(array_index_15);
TEST_CASE(array_index_16);
TEST_CASE(array_index_17);
TEST_CASE(array_index_18);
TEST_CASE(array_index_19);
TEST_CASE(array_index_20);
TEST_CASE(array_index_21);
TEST_CASE(array_index_22);
TEST_CASE(array_index_23);
TEST_CASE(array_index_24); // ticket #1492 and #1539
TEST_CASE(array_index_25); // ticket #1536
TEST_CASE(array_index_26);
TEST_CASE(array_index_27);
TEST_CASE(array_index_28); // ticket #1418
TEST_CASE(array_index_29); // ticket #1734
TEST_CASE(array_index_30); // ticket #2086 - out of bounds when type is unknown
TEST_CASE(array_index_31); // ticket #2120 - out of bounds in subfunction when type is unknown
TEST_CASE(array_index_32);
TEST_CASE(array_index_33); // ticket #3044
TEST_CASE(array_index_34); // ticket #3063
TEST_CASE(array_index_35); // ticket #2889
TEST_CASE(array_index_36); // ticket #2960
TEST_CASE(array_index_37);
TEST_CASE(array_index_38); // ticket #3273
TEST_CASE(array_index_39);
TEST_CASE(array_index_40); // loop variable calculation, taking address
TEST_CASE(array_index_41); // structs with the same name
TEST_CASE(array_index_42);
TEST_CASE(array_index_43); // struct with array
TEST_CASE(array_index_44); // #3979
TEST_CASE(array_index_45); // #4207 - calling function with variable number of parameters (...)
TEST_CASE(array_index_46); // #4840 - two-statement for loop
TEST_CASE(array_index_47); // #5849
TEST_CASE(array_index_48); // #9478
TEST_CASE(array_index_49); // #8653
TEST_CASE(array_index_50);
TEST_CASE(array_index_51); // #3763
TEST_CASE(array_index_52); // #7682
TEST_CASE(array_index_53); // #4750
TEST_CASE(array_index_54); // #10268
TEST_CASE(array_index_55); // #10254
TEST_CASE(array_index_56); // #10284
TEST_CASE(array_index_57); // #10023
TEST_CASE(array_index_58); // #7524
TEST_CASE(array_index_59); // #10413
TEST_CASE(array_index_60); // #10617, #9824
TEST_CASE(array_index_61); // #10621
TEST_CASE(array_index_62); // #7684
TEST_CASE(array_index_63); // #10979
TEST_CASE(array_index_64); // #10878
TEST_CASE(array_index_65); // #11066
TEST_CASE(array_index_66); // #10740
TEST_CASE(array_index_67); // #1596
TEST_CASE(array_index_68); // #6655
TEST_CASE(array_index_69); // #6370
TEST_CASE(array_index_70); // #11355
TEST_CASE(array_index_71); // #11461
TEST_CASE(array_index_72); // #11784
TEST_CASE(array_index_73); // #11530
TEST_CASE(array_index_74); // #11088
TEST_CASE(array_index_75);
TEST_CASE(array_index_76);
TEST_CASE(array_index_multidim);
TEST_CASE(array_index_switch_in_for);
TEST_CASE(array_index_for_in_for); // FP: #2634
TEST_CASE(array_index_bounds);
TEST_CASE(array_index_calculation);
TEST_CASE(array_index_negative1);
TEST_CASE(array_index_negative2); // ticket #3063
TEST_CASE(array_index_negative3);
TEST_CASE(array_index_negative4);
TEST_CASE(array_index_negative5); // #10526
TEST_CASE(array_index_negative6); // #11349
TEST_CASE(array_index_negative7); // #5685
TEST_CASE(array_index_negative8); // #11651
TEST_CASE(array_index_negative9);
TEST_CASE(array_index_negative10);
TEST_CASE(array_index_for_decr);
TEST_CASE(array_index_varnames); // FP: struct member #1576, FN: #1586
TEST_CASE(array_index_for_continue); // for,continue
TEST_CASE(array_index_for); // FN: for,if
TEST_CASE(array_index_for_neq); // #2211: Using != in condition
TEST_CASE(array_index_for_question); // #2561: for, ?:
TEST_CASE(array_index_for_andand_oror); // FN: using && or || in the for loop condition
TEST_CASE(array_index_for_varid0); // #4228: No varid for counter variable
TEST_CASE(array_index_vla_for); // #3221: access VLA inside for
TEST_CASE(array_index_extern); // FP when using 'extern'. #1684
TEST_CASE(array_index_cast); // FP after cast. #2841
TEST_CASE(array_index_string_literal);
TEST_CASE(array_index_same_struct_and_var_name); // #4751 - not handled well when struct name and var name is same
TEST_CASE(array_index_valueflow);
TEST_CASE(array_index_valueflow_pointer);
TEST_CASE(array_index_function_parameter);
TEST_CASE(array_index_enum_array); // #8439
TEST_CASE(array_index_container); // #9386
TEST_CASE(array_index_container_data); // pointer from data()/c_str() carries the container size
TEST_CASE(array_index_two_for_loops);
TEST_CASE(array_index_new); // #7690
TEST_CASE(buffer_overrun_2_struct);
TEST_CASE(buffer_overrun_3);
TEST_CASE(buffer_overrun_4);
TEST_CASE(buffer_overrun_5);
TEST_CASE(buffer_overrun_6);
TEST_CASE(buffer_overrun_7);
TEST_CASE(buffer_overrun_8);
TEST_CASE(buffer_overrun_9);
TEST_CASE(buffer_overrun_10);
TEST_CASE(buffer_overrun_11);
TEST_CASE(buffer_overrun_15); // ticket #1787
TEST_CASE(buffer_overrun_16);
TEST_CASE(buffer_overrun_18); // ticket #2576 - for, calculation with loop variable
TEST_CASE(buffer_overrun_19); // #2597 - class member with unknown type
TEST_CASE(buffer_overrun_21);
TEST_CASE(buffer_overrun_24); // index variable is changed in for-loop
TEST_CASE(buffer_overrun_26); // #4432 (segmentation fault)
TEST_CASE(buffer_overrun_27); // #4444 (segmentation fault)
TEST_CASE(buffer_overrun_29); // #7083: false positive: typedef and initialization with strings
TEST_CASE(buffer_overrun_30); // #6367
TEST_CASE(buffer_overrun_31);
TEST_CASE(buffer_overrun_32); //#10244
TEST_CASE(buffer_overrun_33); //#2019
TEST_CASE(buffer_overrun_34); //#11035
TEST_CASE(buffer_overrun_35); //#2304
TEST_CASE(buffer_overrun_36);
TEST_CASE(buffer_overrun_37);
TEST_CASE(buffer_overrun_38);
TEST_CASE(buffer_overrun_errorpath);
TEST_CASE(buffer_overrun_bailoutIfSwitch); // ticket #2378 : bailoutIfSwitch
TEST_CASE(buffer_overrun_function_array_argument);
TEST_CASE(possible_buffer_overrun_1); // #3035
TEST_CASE(buffer_overrun_readSizeFromCfg);
TEST_CASE(buffer_overrun_handle_addr_of_var); // ticket #7570 - correctly handle &var
TEST_CASE(valueflow_string); // using ValueFlow string values in checking
// It is undefined behaviour to point out of bounds of an array
// the address beyond the last element is in bounds
// char a[10];
// char *p1 = a + 10; // OK
// char *p2 = a + 11 // UB
TEST_CASE(pointer_out_of_bounds_1);
TEST_CASE(pointer_out_of_bounds_2);
TEST_CASE(pointer_out_of_bounds_3);
TEST_CASE(pointer_out_of_bounds_4);
TEST_CASE(pointer_out_of_bounds_5); // #10227
TEST_CASE(pointer_out_of_bounds_sub);
TEST_CASE(strcat1);
TEST_CASE(varid1);
TEST_CASE(varid2); // ticket #4764
TEST_CASE(assign1);
TEST_CASE(alloc_new); // Buffer allocated with new
TEST_CASE(alloc_malloc); // Buffer allocated with malloc
TEST_CASE(alloc_string); // statically allocated buffer
TEST_CASE(alloc_alloca); // Buffer allocated with alloca
// TODO TEST_CASE(countSprintfLength);
TEST_CASE(minsize_argvalue);
TEST_CASE(minsize_sizeof);
TEST_CASE(minsize_strlen);
TEST_CASE(minsize_mul);
TEST_CASE(unknownType);
TEST_CASE(terminateStrncpy1);
TEST_CASE(terminateStrncpy2);
TEST_CASE(terminateStrncpy3);
TEST_CASE(terminateStrncpy4);
TEST_CASE(terminateStrncpy5); // #9944
TEST_CASE(terminateStrncpy_handle_addr_of_var); // #7570
TEST_CASE(recursive_long_time);
TEST_CASE(crash1); // Ticket #1587 - crash
TEST_CASE(crash2); // Ticket #3034 - crash
TEST_CASE(crash3); // Ticket #5426 - crash
TEST_CASE(crash4); // Ticket #8679 - crash
TEST_CASE(crash5); // Ticket #8644 - crash
TEST_CASE(crash6); // Ticket #9024 - crash
TEST_CASE(crash7); // Ticket #9073 - crash
TEST_CASE(insecureCmdLineArgs);
TEST_CASE(checkBufferAllocatedWithStrlen);
TEST_CASE(scope); // handling different scopes
TEST_CASE(getErrorMessages);
// Access array and then check if the used index is within bounds
TEST_CASE(arrayIndexThenCheck);
TEST_CASE(arrayIndexEarlyReturn); // #6884
TEST_CASE(bufferNotZeroTerminated);
TEST_CASE(negativeMemoryAllocationSizeError); // #389
TEST_CASE(negativeArraySize);
TEST_CASE(pointerAddition1);
TEST_CASE(ctu_malloc);
TEST_CASE(ctu_array);
TEST_CASE(ctu_variable);
TEST_CASE(ctu_arithmetic);
TEST_CASE(objectIndex);
TEST_CASE(checkPipeParameterSize); // ticket #3521
}
void noerr1() {
check("extern int ab;\n"
"void f()\n"
"{\n"
" if (ab)\n"
" {\n"
" char str[50];\n"
" }\n"
" if (ab)\n"
" {\n"
" char str[50];\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout_str());
}
void noerr2() {
check("static char buf[2];\n"
"void f1(char *str)\n"
"{\n"
" strcpy(buf,str);\n"
"}\n"
"void f2(char *str)\n"
"{\n"
" strcat(buf,str);\n"
"}\n"
"void f3(char *str)\n"
"{\n"
" sprintf(buf,\"%s\",str);\n"
"}\n"
"void f4(const char str[])\n"
"{\n"
" strcpy(buf, str);\n"
"}\n");
ASSERT_EQUALS("", errout_str());
}
void noerr3() {
check("struct { char data[10]; } abc;\n"
"static char f()\n"
"{\n"
" char data[1];\n"
" return abc.data[1];\n"
"}\n");
ASSERT_EQUALS("", errout_str());
}
void noerr4() {
// The memory isn't read or written and therefore there is no error.
check("static void f() {\n"
" char data[100];\n"
" const char *p = data + 100;\n"
"}\n");
ASSERT_EQUALS("", errout_str());
}
void sizeof3() {
check("struct group { int gr_gid; };\n"
"void f()\n"
"{\n"
" char group[32];\n"
" snprintf(group, 32, \"%u\", 0);\n"
" struct group *gr;\n"
" snprintf(group, 32, \"%u\", gr->gr_gid);\n"
"}\n");
ASSERT_EQUALS("", errout_str());
}
void array_index_1() {
check("void f()\n"
"{\n"
" char str[0x10] = {0};\n"
" str[15] = 0;\n"
" str[16] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5:8]: (error) Array 'str[16]' accessed at index 16, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
check("char f()\n"
"{\n"
" char str[16] = {0};\n"
" return str[16];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4:15]: (error) Array 'str[16]' accessed at index 16, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
// test stack array
check("int f()\n"
"{\n"
" int x[ 3 ] = { 0, 1, 2 };\n"
" int y;\n"
" y = x[ 4 ];\n"
" return y;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5:9]: (error) Array 'x[3]' accessed at index 4, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
check("int f()\n"
"{\n"
" int x[ 3 ] = { 0, 1, 2 };\n"
" int y;\n"
" y = x[ 2 ];\n"
" return y;\n"
"}\n");
ASSERT_EQUALS("", errout_str());
check("int x[5] = {0};\n"
"int a = x[10];\n");
ASSERT_EQUALS("[test.cpp:2:10]: (error) Array 'x[5]' accessed at index 10, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
check("int x[5] = {0};\n"
"int a = (x)[10];\n");
ASSERT_EQUALS("[test.cpp:2:12]: (error) Array 'x[5]' accessed at index 10, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
}
void array_index_2() {
check("void a(int i)\n" // valueflow
"{\n"
" char *str = new char[0x10];\n"
" str[i] = 0;\n"
"}\n"
"void b() { a(16); }\n");
ASSERT_EQUALS("[test.cpp:4:8]: (error) Array 'str[16]' accessed at index 16, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
}
void array_index_4() {
check("char c = \"abc\"[4];\n");
ASSERT_EQUALS("[test.cpp:1:15]: (error) Array '\"abc\"[4]' accessed at index 4, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
check("p = &\"abc\"[4];\n");
ASSERT_EQUALS("", errout_str());
check("char c = \"\\0abc\"[2];\n");
ASSERT_EQUALS("", errout_str());
check("char c = L\"abc\"[4];\n");
ASSERT_EQUALS("[test.cpp:1:16]: (error) Array 'L\"abc\"[4]' accessed at index 4, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
}
void array_index_3() {
check("void f()\n"
"{\n"
" int val[50];\n"
" int i, sum=0;\n"
" for (i = 0; i < 100; i++)\n"
" sum += val[i];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6:19]: (error) Array 'val[50]' accessed at index 99, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
check("void f()\n"
"{\n"
" int val[50];\n"
" int i, sum=0;\n"
" for (i = 1; i < 100; i++)\n"
" sum += val[i];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6:19]: (error) Array 'val[50]' accessed at index 99, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
check("void f(int a)\n"
"{\n"
" int val[50];\n"
" int i, sum=0;\n"
" for (i = a; i < 100; i++)\n"
" sum += val[i];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6:19]: (error) Array 'val[50]' accessed at index 99, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
check("typedef struct g g2[3];\n"
"void foo(char *a)\n"
"{\n"
" for (int i = 0; i < 4; i++)\n"
" {\n"
" a[i]=0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout_str());
check("void foo(int argc)\n"
"{\n"
" char a[2];\n"
" for (int i = 4; i < argc; i++){}\n"
"}\n");
ASSERT_EQUALS("", errout_str());
check("void foo(int a[10]) {\n"
" for (int i=0;istr[1] = 0;"
"}\n");
ASSERT_EQUALS("", errout_str());
// This is not out of bounds because it is not a variable length array
check("struct ABC\n"
"{\n"
" char str[1];\n"
" int x;\n"
"};\n"
"\n"
"static void f()\n"
"{\n"
" struct ABC* x = malloc(sizeof(struct ABC) + 10);\n"
" x->str[1] = 0;"
"}\n");
TODO_ASSERT_EQUALS("error", "", errout_str());
// This is not out of bounds because it is a variable length array
// and the index is within the memory allocated.
/** @todo this works by accident because we ignore any access to this array */
check("struct ABC\n"
"{\n"
" char str[1];\n"
"};\n"
"\n"
"static void f()\n"
"{\n"
" struct ABC* x = malloc(sizeof(struct ABC) + 10);\n"
" x->str[10] = 0;\n"
"}\n");
ASSERT_EQUALS("", errout_str());
// This is out of bounds because it is outside the memory allocated.
/** @todo this doesn't work because of a bug in sizeof(struct) */
check("struct ABC\n"
"{\n"
" char str[1];\n"
"};\n"
"\n"
"static void f()\n"
"{\n"
" struct ABC* x = malloc(sizeof(struct ABC) + 10);\n"
" x->str[11] = 0;\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:9]: (error) Array 'str[1]' accessed at index 11, which is out of bounds.\n", "", errout_str());
// This is out of bounds if 'sizeof(ABC)' is 1 (No padding)
check("struct ABC\n"
"{\n"
" char str[1];\n"
"};\n"
"\n"
"static void f()\n"
"{\n"
" struct ABC* x = malloc(sizeof(ABC) + 10);\n"
" x->str[11] = 0;\n"
"}\n");
TODO_ASSERT_EQUALS("error", "", errout_str());
// This is out of bounds because it is outside the memory allocated
/** @todo this doesn't work because of a bug in sizeof(struct) */
check("struct ABC\n"
"{\n"
" char str[1];\n"
"};\n"
"\n"
"static void f()\n"
"{\n"
" struct ABC* x = malloc(sizeof(struct ABC));\n"
" x->str[1] = 0;\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:9]: (error) Array 'str[1]' accessed at index 1, which is out of bounds.\n", "", errout_str());
// This is out of bounds because it is outside the memory allocated
// But only if 'sizeof(ABC)' is 1 (No padding)
check("struct ABC\n"
"{\n"
" char str[1];\n"
"};\n"
"\n"
"static void f()\n"
"{\n"
" struct ABC* x = malloc(sizeof(ABC));\n"
" x->str[1] = 0;\n"
"}\n");
TODO_ASSERT_EQUALS("error", "", errout_str());
// This is out of bounds because it is not a variable array
check("struct ABC\n"
"{\n"
" char str[1];\n"
"};\n"
"\n"
"static void f()\n"
"{\n"
" struct ABC x;\n"
" x.str[1] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:9:10]: (error) Array 'x.str[1]' accessed at index 1, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
check("struct foo\n"
"{\n"
" char str[10];\n"
"};\n"
"\n"
"void x()\n"
"{\n"
" foo f;\n"
" for ( unsigned int i = 0; i < 64; ++i )\n"
" f.str[i] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:10:14]: (error) Array 'f.str[10]' accessed at index 63, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
check("struct AB { char a[NUM]; char b[NUM]; }\n"
"void f(struct AB *ab) {\n"
" ab->a[0] = 0;\n"
"}\n");
ASSERT_EQUALS("", errout_str());
check("union { char a[1]; int b; } ab;\n"
"void f() {\n"
" ab.a[2] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3:9]: (error) Array 'ab.a[1]' accessed at index 2, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
}
void array_index_7() {
check("struct ABC\n"
"{\n"
" char str[10];\n"
"};\n"
"\n"
"static void f(struct ABC *abc)\n"
"{\n"
" abc->str[10] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:8:13]: (error) Array 'abc->str[10]' accessed at index 10, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
}
void array_index_11() {
check("class ABC\n"
"{\n"
"public:\n"
" ABC();\n"
" char *str[10];\n"
" struct ABC *next();\n"
"};\n"
"\n"
"static void f(ABC *abc1)\n"
"{\n"
" for ( ABC *abc = abc1; abc; abc = abc->next() )\n"
" {\n"
" abc->str[10] = 0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:13:17]: (error) Array 'abc->str[10]' accessed at index 10, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
}
void array_index_12() {
check("class Fred\n"
"{\n"
"private:\n"
" char str[10];\n"
"public:\n"
" Fred();\n"
"};\n"
"Fred::Fred()\n"
"{\n"
" str[10] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:10:8]: (error) Array 'str[10]' accessed at index 10, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
check("class Fred\n"
"{\n"
"private:\n"
" char str[10];\n"
"public:\n"
" char c();\n"
"};\n"
"char Fred::c()\n"
"{\n"
" return str[10];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:10:15]: (error) Array 'str[10]' accessed at index 10, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
}
void array_index_13() {
check("void f()\n"
"{\n"
" char buf[10];\n"
" for (int i = 0; i < 100; i++)\n"
" {\n"
" if (i < 10)\n"
" int x = buf[i];\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout_str());
}
void array_index_14() {
check("void f()\n"
"{\n"
" int a[10];\n"
" for (int i = 0; i < 10; i++)\n"
" a[i+10] = i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5:10]: (error) Array 'a[10]' accessed at index 19, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
}
void array_index_15() {
check("void f()\n"
"{\n"
" int a[10];\n"
" for (int i = 0; i < 10; i++)\n"
" a[10+i] = i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5:10]: (error) Array 'a[10]' accessed at index 19, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
}
void array_index_16() {
check("void f()\n"
"{\n"
" int a[10];\n"
" for (int i = 0; i < 10; i++)\n"
" a[i+1] = i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5:10]: (error) Array 'a[10]' accessed at index 10, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
}
void array_index_17() {
check("void f()\n"
"{\n"
" int a[10];\n"
" for (int i = 0; i < 10; i++)\n"
" a[i*2] = i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5:10]: (error) Array 'a[10]' accessed at index 18, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
check("void f()\n"
"{\n"
" int a[12];\n"
" for (int i = 0; i < 12; i+=6)\n"
" a[i+5] = i;\n"
"}\n");
ASSERT_EQUALS("", errout_str());
check("void f()\n"
"{\n"
" int a[12];\n"
" for (int i = 0; i < 12; i+=6)\n"
" a[i+6] = i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5:10]: (error) Array 'a[12]' accessed at index 12, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
check("void f() {\n" // #4398
" int a[2];\n"
" for (int i = 0; i < 4; i+=2)\n"
" a[i] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4:10]: (error) Array 'a[2]' accessed at index 2, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
check("void f() {\n" // #4398
" int a[2];\n"
" for (int i = 0; i < 4; i+=2)\n"
" do_stuff(a+i);\n"
"}\n");
ASSERT_EQUALS("", errout_str());
}
void array_index_18() {
check("void f()\n"
"{\n"
" int a[5];\n"
" for (int i = 0; i < 6; i++)\n"
" {\n"
" a[i] = i;\n"
" i+=1;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout_str());
check("void f()\n"
"{\n"
" int a[5];\n"
" for (int i = 0; i < 6; i++)\n"
" {\n"
" a[i] = i;\n"
" i++;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout_str());
check("void f()\n"
"{\n"
" int a[5];\n"
" for (int i = 0; i < 6; i++)\n"
" {\n"
" a[i] = i;\n"
" ++i;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout_str());
check("void f()\n"
"{\n"
" int a[5];\n"
" for (int i = 0; i < 6; i++)\n"
" {\n"
" a[i] = i;\n"
" i=4;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6:10]: (error) Array 'a[5]' accessed at index 5, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
check("void f()\n"
"{\n"
" int a[6];\n"
" for (int i = 0; i < 7; i++)\n"
" {\n"
" a[i] = i;\n"
" i+=1;\n"
" }\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:6]: (error) Buffer overrun\n", "", errout_str());
}
void array_index_19() {
// "One Past the End" is legal, as long as pointer is not dereferenced.
check("void f()\n"
"{\n"
" char a[2];\n"
" char *end = &(a[2]);\n"
"}\n");
ASSERT_EQUALS("", errout_str());
// Getting more than one past the end is not legal
check("void f()\n"
"{\n"
" char a[2];\n"
" char *end = &(a[3]);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4:18]: (error) Array 'a[2]' accessed at index 3, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
}
void array_index_20() {
check("void f()\n"
"{\n"
" char a[8];\n"
" int b[10];\n"
" for ( int i = 0; i < 9; i++ )\n"
" b[i] = 0;\n"
"}\n");
ASSERT_EQUALS("", errout_str());
}
void array_index_21() {
check("class A {\n"
" int indices[2];\n"
" void foo(int indices[3]);\n"
"};\n"
"\n"
"void A::foo(int indices[3]) {\n"
" for(int j=0; jb[10][2] = 4;\n"
" ptest->b[0][19] = 4;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:9:11]: (error) Array 'test.a[10]' accessed at index 10, which is out of bounds. [arrayIndexOutOfBounds]\n"
"[test.cpp:10:11]: (error) Array 'test.b[10][5]' accessed at index test.b[10][2], which is out of bounds. [arrayIndexOutOfBounds]\n"
"[test.cpp:11:11]: (error) Array 'test.b[10][5]' accessed at index test.b[0][19], which is out of bounds. [arrayIndexOutOfBounds]\n"
"[test.cpp:14:13]: (error) Array 'ptest->a[10]' accessed at index 10, which is out of bounds. [arrayIndexOutOfBounds]\n"
"[test.cpp:15:13]: (error) Array 'ptest->b[10][5]' accessed at index ptest->b[10][2], which is out of bounds. [arrayIndexOutOfBounds]\n"
"[test.cpp:16:13]: (error) Array 'ptest->b[10][5]' accessed at index ptest->b[0][19], which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
check("struct TEST\n"
"{\n"
" char a[10][5];\n"
"};\n"
"void foo()\n"
"{\n"
" TEST test;\n"
" test.a[9][5] = 4;\n"
" test.a[0][50] = 4;\n"
" TEST *ptest;\n"
" ptest = &test;\n"
" ptest->a[9][5] = 4;\n"
" ptest->a[0][50] = 4;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:8:11]: (error) Array 'test.a[10][5]' accessed at index test.a[9][5], which is out of bounds. [arrayIndexOutOfBounds]\n"
"[test.cpp:9:11]: (error) Array 'test.a[10][5]' accessed at index test.a[0][50], which is out of bounds. [arrayIndexOutOfBounds]\n"
"[test.cpp:12:13]: (error) Array 'ptest->a[10][5]' accessed at index ptest->a[9][5], which is out of bounds. [arrayIndexOutOfBounds]\n"
"[test.cpp:13:13]: (error) Array 'ptest->a[10][5]' accessed at index ptest->a[0][50], which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
}
void array_index_35() { // ticket #2889
check("void f() {\n"
" struct Struct { unsigned m_Var[1]; } s;\n"
" s.m_Var[1] = 1;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3:12]: (error) Array 's.m_Var[1]' accessed at index 1, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
check("struct Struct { unsigned m_Var[1]; };\n"
"void f() {\n"
" struct Struct s;\n"
" s.m_Var[1] = 1;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4:12]: (error) Array 's.m_Var[1]' accessed at index 1, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
check("struct Struct { unsigned m_Var[1]; };\n"
"void f() {\n"
" struct Struct * s = calloc(40);\n"
" s->m_Var[1] = 1;\n"
"}\n");
ASSERT_EQUALS("", errout_str());
}
void array_index_36() { // ticket #2960
check("class Fred {\n"
" Fred(const Fred &);\n"
"private:\n"
" bool m_b[2];\n"
"};\n"
"Fred::Fred(const Fred & rhs) {\n"
" m_b[2] = rhs.m_b[2];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7:8]: (error) Array 'm_b[2]' accessed at index 2, which is out of bounds. [arrayIndexOutOfBounds]\n"
"[test.cpp:7:21]: (error) Array 'rhs.m_b[2]' accessed at index 2, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
}
void array_index_37() {
check("class Fred {\n"
" char x[X];\n"
" Fred() {\n"
" for (unsigned int i = 0; i < 15; i++)\n"
" i;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout_str());
}
void array_index_38() { //ticket #3273
check("void aFunction() {\n"
" double aDoubleArray[ 10 ];\n"
" unsigned int i; i = 0;\n"
" for( i = 0; i < 6; i++ )\n"
" {\n"
" unsigned int j; j = 0;\n"
" for( j = 0; j < 5; j++ )\n"
" {\n"
" unsigned int x; x = 0;\n"
" for( x = 0; x < 4; x++ )\n"
" {\n"
" }\n"
" }\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout_str());
}
void array_index_39() { // ticket 3387
check("void aFunction()\n"
"{\n"
" char a[10];\n"
" a[10] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4:6]: (error) Array 'a[10]' accessed at index 10, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
}
void array_index_40() {
check("void f() {\n"
" char a[10];\n"
" for (int i = 0; i < 10; ++i)\n"
" f2(&a[i + 1]);\n"
"}\n");
ASSERT_EQUALS("", errout_str());
}
void array_index_41() {
// Don't generate false positives when structs have the same name
check("void a() {\n"
" struct Fred { char data[6]; } fred;\n"
" fred.data[4] = 0;\n" // no error
check("void f1(char *buf) {\n"
" buf[4] = 0;\n"
"}\n"
"void f2() {\n"
" int x[2];\n"
" f1(x);\n"
"}\n");
ASSERT_EQUALS("", errout_str());
// Same type => error
check("void f1(const char buf[]) {\n"
" char c = buf[4];\n"
"}\n"
"void f2() {\n"
" char x[2];\n"
" f1(x);\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:6] -> [test.cpp:2]: (error) Array 'x[2]' accessed at index 4, which is out of bounds.\n",
"",
errout_str());
}
void array_index_string_literal() {
check("void f() {\n"
" const char *str = \"abc\";\n"
" bar(str[10]);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3:12]: (error) Array 'str[4]' accessed at index 10, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
check("void f()\n"
"{\n"
" const char *str = \"abc\";\n"
" bar(str[4]);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4:12]: (error) Array 'str[4]' accessed at index 4, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
check("void f()\n"
"{\n"
" const char *str = \"abc\";\n"
" bar(str[3]);\n"
"}\n");
ASSERT_EQUALS("", errout_str());
check("void f()\n"
"{\n"
" const char *str = \"a\tc\";\n"
" bar(str[4]);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4:12]: (error) Array 'str[4]' accessed at index 4, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
check("void f() {\n" // #6973
" const char *name = \"\";\n"
" if ( name[0] == 'U' ? name[1] : 0) {}\n"
"}\n");
ASSERT_EQUALS("", errout_str());
check("int main(int argc, char **argv) {\n"
" char str[6] = \"\\0\";\n"
" unsigned short port = 65535;\n"
" snprintf(str, sizeof(str), \"%hu\", port);\n"
"}\n", dinit(CheckOptions, $.cpp = false));
ASSERT_EQUALS("", errout_str());
check("int f(int x) {\n" // #11020
" const char* p = (x == 0 ? \"12345\" : \"ABC\");\n"
" int s = 0;\n"
" for (int i = 0; p[i]; i++)\n"
" s += p[i];\n"
" return s;\n"
"}\n");
ASSERT_EQUALS("", errout_str());
}
void array_index_same_struct_and_var_name() {
// don't throw internal error
check("struct tt {\n"
" char name[21];\n"
"} ;\n"
"void doswitch(struct tt *x)\n"
"{\n"
" struct tt *tt=x;\n"
" tt->name;\n"
"}\n");
ASSERT_EQUALS("", errout_str());
// detect error
check("struct tt {\n"
" char name[21];\n"
"} ;\n"
"void doswitch(struct tt *x)\n"
"{\n"
" struct tt *tt=x;\n"
" tt->name[22] = 123;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7:13]: (error) Array 'tt->name[21]' accessed at index 22, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
}
void array_index_valueflow() {
check("void f(int i) {\n"
" char str[3];\n"
" str[i] = 0;\n"
" if (i==10) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4:10] -> [test.cpp:3:8]: (warning) Either the condition 'i==10' is redundant or the array 'str[3]' is accessed at index 10, which is out of bounds. [arrayIndexOutOfBoundsCond]\n", errout_str());
check("void f(int i) {\n"
" char str[3];\n"
" str[i] = 0;\n"
" switch (i) {\n"
" case 10: break;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5:5] -> [test.cpp:3:8]: (warning) Either the switch case 'case 10' is redundant or the array 'str[3]' is accessed at index 10, which is out of bounds. [arrayIndexOutOfBoundsCond]\n", errout_str());
check("void f() {\n"
" char str[3];\n"
" str[((unsigned char)3) - 1] = 0;\n"
"}\n");
ASSERT_EQUALS("", errout_str());
check("void f() {\n" // #5416 FP
" char *str[3];\n"
" do_something(&str[0][5]);\n"
"}\n");
ASSERT_EQUALS("", errout_str());
check("class X { static const int x[100]; };\n" // #6070
"const int X::x[100] = {0};\n");
ASSERT_EQUALS("", errout_str());
check("namespace { class X { static const int x[100]; };\n" // #6232
"const int X::x[100] = {0}; }\n");
ASSERT_EQUALS("", errout_str());
check("class ActorSprite { static ImageSet * targetCursorImages[2][10]; };\n"
"ImageSet *ActorSprite::targetCursorImages[2][10];\n");
ASSERT_EQUALS("", errout_str());
check("int f(const std::size_t s) {\n" // #10130
" const char a[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };\n"
" return (s > sizeof(a)) ? 11 : (int)a[s];\n"
"}\n"
"int g() {\n"
" return f(16);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3:15] -> [test.cpp:3:41]: (warning) Either the condition 's>sizeof(a)' is redundant or the array 'a[16]' is accessed at index 16, which is out of bounds. [arrayIndexOutOfBoundsCond]\n",
errout_str());
check("void f(int fd) {\n" // #12318
" char buf[10];\n"
" int size = 0;\n"
" int pos = -1;\n"
" do {\n"
" pos++;\n"
" size = read(fd, &buf[pos], 1);\n"
" } while (size > 0);\n"
" buf[pos] = '\\0';\n"
"}\n");
ASSERT_EQUALS("", errout_str());
}
void array_index_valueflow_pointer() {
check("void f() {\n"
" int a[10];\n"
" int *p = a;\n"
" p[20] = 0;\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (error) Array 'a[10]' accessed at index 20, which is out of bounds.\n", "", errout_str());
{
// address of
check("void f() {\n"
" int a[10];\n"
" int *p = a;\n"
" p[10] = 0;\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4:6]: (error) Array 'a[10]' accessed at index 10, which is out of bounds. [arrayIndexOutOfBounds]\n", "", errout_str());
check("void f() {\n"
" int a[10];\n"
" int *p = a;\n"
" dostuff(&p[10]);\n"
"}\n");
ASSERT_EQUALS("", errout_str());
}
check("void f() {\n"
" int a[X];\n" // unknown size
" int *p = a;\n"
" p[20] = 0;\n"
"}\n");
ASSERT_EQUALS("", errout_str());
check("void f() {\n"
" int a[2];\n"
" char *p = (char *)a;\n" // cast
" p[4] = 0;\n"
"}\n");
ASSERT_EQUALS("", errout_str());
}
void array_index_function_parameter() {
check("void f(char a[10]) {\n"
" a[20] = 0;\n" // m[9]' accessed at index 36, which is out of bounds. [arrayIndexOutOfBounds]\n", errout_str());
}
void buffer_overrun_31() {
check("void f(WhereInfo *pWInfo, int *aiCur) {\n"
" memcpy(aiCur, pWInfo->aiCurOnePass, sizeof(int)*2);\n"
"}\n");
ASSERT_EQUALS("", errout_str());
}
void buffer_overrun_32() {
// destination size is too small
check("void f(void) {\n"
" const char src[3] = \"abc\";\n"
" char dest[1] = \"a\";\n"
" (void)strxfrm(dest,src,1);\n"
" (void)strxfrm(dest,src,2);\n"//