From a78341e26c7bf5733abe7c984b25e718a15aeb48 Mon Sep 17 00:00:00 2001
From: Christoph Gohlke <cjgohlke@gmail.com>
Date: Tue, 25 Jun 2019 14:23:20 -0700
Subject: [PATCH] Fix potential null pointer is passed into memcpy

---
 src/libImaging/TiffDecode.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/libImaging/TiffDecode.c b/src/libImaging/TiffDecode.c
index a68f73993..871b0bcdb 100644
--- a/src/libImaging/TiffDecode.c
+++ b/src/libImaging/TiffDecode.c
@@ -194,6 +194,9 @@ int ReadTile(TIFF* tiff, UINT32 col, UINT32 row, UINT32* buffer) {
         }
 
         swap_line = (UINT32*)malloc(swap_line_size);
+        if (swap_line == NULL) {
+            return -1;
+        }
         /*
          * For some reason the TIFFReadRGBATile() function chooses the
          * lower left corner as the origin.  Vertically mirror scanlines.