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avcodec/truemotion2: Fix 2 integer overflows in tm2_low_res_block() 

Fixes: signed integer overflow: 1778647621 + 574372924 cannot be represented in type 'int'
Fixes: 18692/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TRUEMOTION2_fuzzer-6248679635943424

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 93d52a181e)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-11-12 18:47:52 +01:00
parent 7bf4d235c0
commit 6bb2004c82
1 changed files with 2 additions and 2 deletions
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libavcodec/truemotion2.c
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@ -586,10 +586,10 @@ static inline void tm2_low_res_block(TM2Context *ctx, AVFrame *pic, int bx, int
last[0] = (int)((unsigned)last[1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3])>> 1;
last[2] = (int)((unsigned)last[1] + last[3]) >> 1;
t1 = ctx->D[0] + ctx->D[1];
t1 = ctx->D[0] + (unsigned)ctx->D[1];
ctx->D[0] = t1 >> 1;
ctx->D[1] = t1 - (t1 >> 1);
t2 = ctx->D[2] + ctx->D[3];
t2 = ctx->D[2] + (unsigned)ctx->D[3];
ctx->D[2] = t2 >> 1;
ctx->D[3] = t2 - (t2 >> 1);