commit 751b4eba25aa2e2a31232c9c25ceb6dbddfb1d93
author Marco Nelissen <marcone@google.com> Thu Jun 09 14:07:50 2016 -0700
committer Marco Nelissen <marcone@google.com> Thu Jun 09 21:09:13 2016 +0000
tree 6dd0e64c7a364aa4232838e813dab0e4885ad8d5
parent acbfc9c1c7e1a84b0db4dc5bc3d5346b6c55c473

Fix possible out of bounds access

Bug: 28868315
Change-Id: I2b416c662f9ad7f9b3c6cf973a39c6693c66775a

exif.c

diff --git a/exif.c b/exif.c
index bb01453..2c89293 100644
--- a/exif.c
+++ b/exif.c
@@ -614,7 +614,7 @@
             unsigned OffsetVal;
             OffsetVal = Get32u(DirEntry+8);
             // If its bigger than 4 bytes, the dir entry contains an offset.
-            if (OffsetVal+ByteCount > ExifLength){
+            if (OffsetVal > UINT32_MAX - ByteCount || OffsetVal+ByteCount > ExifLength){
                 // Bogus pointer offset and / or bytecount value
                 ErrNonfatal("Illegal value pointer for tag %04x", Tag,0);
                 continue;