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

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Free the stack allocated in va_build_stack if do_mkstack fails
and the stack is not a small_stack
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Tony Solomonik 2020-08-30 07:53:08 +03:00 • committed by GitHub
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commit 75c80b0bda
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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
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@ -622,6 +622,9 @@ va_build_stack(PyObject **small_stack, Py_ssize_t small_stack_len,
va_end(lva); va_end(lva);
if (res < 0) { if (res < 0) {
if (stack != small_stack) {
PyMem_Free(stack);
}
return NULL; return NULL;
} }