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gh-99240: Reset pointer to NULL when the pointed memory is freed in argument parsing #99890

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merged 9 commits into from
Dec 17, 2022
Merged

gh-99240: Reset pointer to NULL when the pointed memory is freed in argument parsing #99890

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9271e85
Reset pointer to NULL when memory is freed
colorfulappl Nov 30, 2022
eba62a3
Add news
colorfulappl Nov 30, 2022
39895ee
Remove unnecessary null-check
colorfulappl Dec 14, 2022
ef866b2
Add test
colorfulappl Dec 15, 2022
357576b
Fix an error
colorfulappl Dec 16, 2022
0424701
PyMem_FREE -> PyMem_Free
kumaraditya303 Dec 16, 2022
4a7d386
Update Modules/_testcapi/getargs.c
kumaraditya303 Dec 16, 2022
1d3b069
Merge branch 'main' into clear_freed_pointer
kumaraditya303 Dec 16, 2022
6e9744c
Update Modules/_testcapi/getargs.c
erlend-aasland Dec 16, 2022
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/C API/2022-11-30-16-39-22.gh-issue-99240.67nAX-.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
In argument parsing, after deallocating newly allocated memory, reset its
pointer to NULL.
10 changes: 6 additions & 4 deletions Python/getargs.c
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Original file line number Diff line number Diff line change
Expand Up @@ -202,8 +202,10 @@ _PyArg_VaParse_SizeT(PyObject *args, const char *format, va_list va)
static int
cleanup_ptr(PyObject *self, void *ptr)
{
if (ptr) {
PyMem_Free(ptr);
void **pptr = (void **)ptr;
if (*pptr) {
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PyMem_Free(*pptr);
*pptr = NULL;
}
return 0;
}
Expand Down Expand Up @@ -1116,7 +1118,7 @@ convertsimple(PyObject *arg, const char **p_format, va_list *p_va, int flags,
PyErr_NoMemory();
RETURN_ERR_OCCURRED;
}
if (addcleanup(*buffer, freelist, cleanup_ptr)) {
if (addcleanup(buffer, freelist, cleanup_ptr)) {
Py_DECREF(s);
return converterr(
"(cleanup problem)",
Expand Down Expand Up @@ -1162,7 +1164,7 @@ convertsimple(PyObject *arg, const char **p_format, va_list *p_va, int flags,
PyErr_NoMemory();
RETURN_ERR_OCCURRED;
}
if (addcleanup(*buffer, freelist, cleanup_ptr)) {
if (addcleanup(buffer, freelist, cleanup_ptr)) {
Py_DECREF(s);
return converterr("(cleanup problem)",
arg, msgbuf, bufsize);
Expand Down