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bpo-32869: Fix incorrect dst buffer size for MultiByteToWideChar (GH-… · python/cpython@ca82e3c · GitHub

  1. python
  2. cpython

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Commit ca82e3c

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miss-islington
and
izbyshev
authored
bpo-32869: Fix incorrect dst buffer size for MultiByteToWideChar (GH-5739)
This function expects the destination buffer size to be given in wide characters, not bytes. (cherry picked from commit b3b4a9d) Co-authored-by: Alexey Izbyshev <izbyshev@users.noreply.github.com>
1 parent 2e84e47 commit ca82e3c

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Lines changed: 2 additions & 1 deletion

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‎Python/fileutils.c‎

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1289,7 +1289,8 @@ _Py_fopen_obj(PyObject *path, const char *mode)
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if (wpath == NULL)
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return NULL;
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usize = MultiByteToWideChar(CP_ACP, 0, mode, -1, wmode, sizeof(wmode));
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usize = MultiByteToWideChar(CP_ACP, 0, mode, -1,
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wmode, Py_ARRAY_LENGTH(wmode));
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if (usize == 0) {
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PyErr_SetFromWindowsErr(0);
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return NULL;

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