1*4882a593SmuzhiyunFrom 7b91458541769f3d7eddc55a39d01730af2489fc Mon Sep 17 00:00:00 2001
2*4882a593SmuzhiyunFrom: Even Rouault <even.rouault@spatialys.com>
3*4882a593SmuzhiyunDate: Sat, 5 Feb 2022 20:36:41 +0100
4*4882a593SmuzhiyunSubject: [PATCH] TIFFReadDirectory(): avoid calling memcpy() with a null
5*4882a593Smuzhiyun source pointer and size of zero (fixes #362)
6*4882a593Smuzhiyun
7*4882a593SmuzhiyunUpstream-Status: Backport
8*4882a593SmuzhiyunCVE: CVE-2022-0562
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun---
11*4882a593Smuzhiyun libtiff/tif_dirread.c | 3 ++-
12*4882a593Smuzhiyun 1 file changed, 2 insertions(+), 1 deletion(-)
13*4882a593Smuzhiyun
14*4882a593Smuzhiyundiff --git a/libtiff/tif_dirread.c b/libtiff/tif_dirread.c
15*4882a593Smuzhiyunindex d84147a..ae52ad4 100644
16*4882a593Smuzhiyun--- a/libtiff/tif_dirread.c
17*4882a593Smuzhiyun+++ b/libtiff/tif_dirread.c
18*4882a593Smuzhiyun@@ -4173,7 +4173,8 @@ TIFFReadDirectory(TIFF* tif)
19*4882a593Smuzhiyun                     goto bad;
20*4882a593Smuzhiyun                 }
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun-                memcpy(new_sampleinfo, tif->tif_dir.td_sampleinfo, old_extrasamples * sizeof(uint16_t));
23*4882a593Smuzhiyun+                if (old_extrasamples > 0)
24*4882a593Smuzhiyun+                    memcpy(new_sampleinfo, tif->tif_dir.td_sampleinfo, old_extrasamples * sizeof(uint16_t));
25*4882a593Smuzhiyun                 _TIFFsetShortArray(&tif->tif_dir.td_sampleinfo, new_sampleinfo, tif->tif_dir.td_extrasamples);
26*4882a593Smuzhiyun                 _TIFFfree(new_sampleinfo);
27*4882a593Smuzhiyun         }
28