[FFmpeg-cvslog] avcodec/truemotion2: Fix integer overflow in tm2_null_res_block()
Michael Niedermayer
git at videolan.org
Wed Mar 27 19:39:38 EET 2019
ffmpeg | branch: release/4.0 | Michael Niedermayer <michael at niedermayer.cc> | Sat Mar 16 02:30:57 2019 +0100| [d34202f4f036eb68f5b131138c167e79b5d97aa2] | committer: Michael Niedermayer
avcodec/truemotion2: Fix integer overflow in tm2_null_res_block()
Fixes: signed integer overflow: 1111638592 - -2122219136 cannot be represented in type 'int'
Fixes: 13441/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TRUEMOTION2_fuzzer-5732769815068672
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 1223696c725a8ea7e80498e6ccfab37eea179b76)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=d34202f4f036eb68f5b131138c167e79b5d97aa2
---
libavcodec/truemotion2.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/libavcodec/truemotion2.c b/libavcodec/truemotion2.c
index 2945d9948d..bc3f16827c 100644
--- a/libavcodec/truemotion2.c
+++ b/libavcodec/truemotion2.c
@@ -587,7 +587,8 @@ static inline void tm2_null_res_block(TM2Context *ctx, AVFrame *pic, int bx, int
{
int i;
int ct;
- int left, right, diff;
+ unsigned left, right;
+ int diff;
int deltas[16];
TM2_INIT_POINTERS();
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