From 75c80b0bda89debf312f075716b8c467d411f90e Mon Sep 17 00:00:00 2001
From: Tony Solomonik <tony.solomonik@gmail.com>
Date: Sun, 30 Aug 2020 07:53:08 +0300
Subject: 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
---
 Python/modsupport.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'Python/modsupport.c')

diff --git a/Python/modsupport.c b/Python/modsupport.c
index 2637039d4a..2dabcf3834 100644
--- a/Python/modsupport.c
+++ b/Python/modsupport.c
@@ -622,6 +622,9 @@ 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;
     }
 
-- 
cgit v1.2.1