[FFmpeg-cvslog] avcodec/truemotion2: fix integer overflows in tm2_low_chroma()

[Michael Niedermayer]

ffmpeg | branch: release/3.2 | Michael Niedermayer <michael at niedermayer.cc> | Sat Nov 17 00:38:53 2018 +0100| [dfa3a5ac631832afde852dd62db7833e916ecbdd] | 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=dfa3a5ac631832afde852dd62db7833e916ecbdd
---

 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;