From 7673cb7549e5071d39e76419204c56b0f07199bb Mon Sep 17 00:00:00 2001
From: Christoph Gohlke <cjgohlke@gmail.com>
Date: Sat, 19 Dec 2020 14:57:55 -0800
Subject: [PATCH] Fix dereferencing potential null pointer

---
 src/_imaging.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/_imaging.c b/src/_imaging.c
index 3635d2afa..53a03fc88 100644
--- a/src/_imaging.c
+++ b/src/_imaging.c
@@ -3180,6 +3180,10 @@ _draw_polygon(ImagingDrawObject* self, PyObject* args)
 
     /* Copy list of vertices to array */
     ixy = (int*) calloc(n, 2 * sizeof(int));
+    if (ixy == NULL) {
+        free(xy);
+        return NULL;
+    }
 
     for (i = 0; i < n; i++) {
         ixy[i+i] = (int) xy[i+i];