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gh-106693: Explicitly mark ob_sval as unsigned char to avoid UB by pablogsal · Pull Request #106826 · python/cpython · GitHub

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gh-106693: Explicitly mark ob_sval as unsigned char to avoid UB #106826

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Merged
pablogsal merged 2 commits into from
May 7, 2026
Conversation 7 Commits 2 Checks 47 Files changed
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gh-106693: Explicitly mark ob_sval as unsigned char to avoid UB #106826

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gh-106693: Explicitly mark ob_sval as unsigned char to avoid UB
pablogsal Jul 17, 2023
a97c083
Merge branch 'main' into gh-106693
pablogsal Sep 19, 2025
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4 changes: 2 additions & 2 deletions Include/cpython/bytesobject.h
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,7 @@
typedef struct {
PyObject_VAR_HEAD
Py_DEPRECATED(3.11) Py_hash_t ob_shash;
char ob_sval[1];
unsigned char ob_sval[1];

/* Invariants:
* ob_sval contains space for 'ob_size+1' elements.
Expand All @@ -20,11 +20,11 @@
#define _PyBytes_CAST(op) \
(assert(PyBytes_Check(op)), _Py_CAST(PyBytesObject*, op))

static inline char* PyBytes_AS_STRING(PyObject *op)
static inline unsigned char* PyBytes_AS_STRING(PyObject *op)
{
return _PyBytes_CAST(op)->ob_sval;
}
#define PyBytes_AS_STRING(op) PyBytes_AS_STRING(_PyObject_CAST(op))

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pointer targets in initialization of ‘char *’ from ‘unsigned char *’ differ in signedness [-Wpointer-sign]

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pointer targets in initialization of ‘char *’ from ‘unsigned char *’ differ in signedness [-Wpointer-sign]

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pointer targets in initialization of ‘char *’ from ‘unsigned char *’ differ in signedness [-Wpointer-sign]

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static inline Py_ssize_t PyBytes_GET_SIZE(PyObject *op) {
PyBytesObject *self = _PyBytes_CAST(op);
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