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[3.8] closes bpo-41533: Fix a potential memory leak when allocating a stack (GH-21847) (GH-22015) 

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>
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Miss Islington (bot) 2020-09-04 15:26:05 -07:00 committed by GitHub
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commit 66e9c2aee4
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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

@ -618,6 +618,9 @@ 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;
}