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closes bpo-41533: Fix a potential memory leak when allocating a stack (GH-21847) 

Free the stack allocated in va_build_stack if do_mkstack fails
and the stack is not a small_stack
(cherry picked from commit 75c80b0bda)

Co-authored-by: Tony Solomonik <tony.solomonik@gmail.com>
This commit is contained in:
Miss Islington (bot) 2020-09-04 15:56:04 -07:00 committed by GitHub
parent 8ed1c177c9
commit 106c1df736
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2
Misc/NEWS.d/next/Core and Builtins/2020-08-12-20-29-57.bpo-41533.4pcVAc.rst Normal file
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@ -0,0 +1,2 @@
Free the stack allocated in ``va_build_stack`` if ``do_mkstack`` fails and
the stack is not a ``small_stack``.

3
Python/modsupport.c
View File

@ -619,6 +619,9 @@ va_build_stack(PyObject **small_stack, Py_ssize_t small_stack_len,
va_end(lva);
if (res < 0) {
if (stack != small_stack) {
PyMem_Free(stack);
}
return NULL;
}