[FFmpeg-cvslog] avcodec/truemotion2: fix integer overflows in tm2_low_chroma()
Michael Niedermayer
git at videolan.org
Thu Mar 21 20:13:01 EET 2019
ffmpeg | branch: release/4.0 | Michael Niedermayer <michael at niedermayer.cc> | Sat Nov 17 00:38:53 2018 +0100| [040aa140748af9a546f6a2961a329263cd248f03] | committer: Michael Niedermayer
avcodec/truemotion2: fix integer overflows in tm2_low_chroma()
Fixes: 11295/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TRUEMOTION2_fuzzer-4888953459572736
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 2ae39d795613f3c6925c59852b625029b747fe42)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=040aa140748af9a546f6a2961a329263cd248f03
---
libavcodec/truemotion2.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/libavcodec/truemotion2.c b/libavcodec/truemotion2.c
index b689efdb99..2945d9948d 100644
--- a/libavcodec/truemotion2.c
+++ b/libavcodec/truemotion2.c
@@ -480,7 +480,7 @@ static inline void tm2_high_chroma(int *data, int stride, int *last, unsigned *C
}
}
-static inline void tm2_low_chroma(int *data, int stride, int *clast, int *CD, int *deltas, int bx)
+static inline void tm2_low_chroma(int *data, int stride, int *clast, unsigned *CD, int *deltas, int bx)
{
int t;
int l;
@@ -490,8 +490,8 @@ static inline void tm2_low_chroma(int *data, int stride, int *clast, int *CD, in
prev = clast[-3];
else
prev = 0;
- t = (CD[0] + CD[1]) >> 1;
- l = (prev - CD[0] - CD[1] + clast[1]) >> 1;
+ t = (int)(CD[0] + CD[1]) >> 1;
+ l = (int)(prev - CD[0] - CD[1] + clast[1]) >> 1;
CD[1] = CD[0] + CD[1] - t;
CD[0] = t;
clast[0] = l;
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