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Replace the size check for PyMem_MALLOC and PyMem_REALLOC with an almost

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equivalent[*] check that doesn't produce compiler warnings about a 'x < 0'
check on an unsigned type.

[*] it's equivalent for inputs of type size_t or Py_ssize_t, or any smaller
unsigned or signed integer type.
This commit is contained in:
Mark Dickinson 2009-12-10 10:36:32 +00:00
parent 9fa9a0d635
commit fd25634715
1 changed files with 2 additions and 2 deletions
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4
Include/pymem.h
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@ -71,9 +71,9 @@ PyAPI_FUNC(void) PyMem_Free(void *);
pymalloc. To solve these problems, allocate an extra byte. */
/* Returns NULL to indicate error if a negative size or size larger than
Py_ssize_t can represent is supplied. Helps prevents security holes. */
#define PyMem_MALLOC(n) (((n) < 0 || (n) > PY_SSIZE_T_MAX) ? NULL \
#define PyMem_MALLOC(n) ((size_t)(n) > (size_t)PY_SSIZE_T_MAX ? NULL \
: malloc((n) ? (n) : 1))
#define PyMem_REALLOC(p, n) (((n) < 0 || (n) > PY_SSIZE_T_MAX) ? NULL \
#define PyMem_REALLOC(p, n) ((size_t)(n) > (size_t)PY_SSIZE_T_MAX ? NULL \
: realloc((p), (n) ? (n) : 1))
#define PyMem_FREE free