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avcodec/truemotion2: Fix 2 integer overflows in tm2_update_block()

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Fixes: signed integer overflow: -2147483648 + -1 cannot be represented in type 'int'
Fixes: 14107/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TRUEMOTION2_fuzzer-5694078680825856

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 f4a1b8d409639b2394589efe20ad55410cce391c)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-04-20 01:05:44 +02:00
parent af511f8a3f
commit 043ccb3a19
1 changed files with 2 additions and 2 deletions
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4
libavcodec/truemotion2.c
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@ -674,8 +674,8 @@ static inline void tm2_update_block(TM2Context *ctx, AVFrame *pic, int bx, int b
/* update chroma */ /* update chroma */
for (j = 0; j < 2; j++) { for (j = 0; j < 2; j++) {
for (i = 0; i < 2; i++) { for (i = 0; i < 2; i++) {
U[i] = Uo[i] + GET_TOK(ctx, TM2_UPD); U[i] = Uo[i] + (unsigned)GET_TOK(ctx, TM2_UPD);
V[i] = Vo[i] + GET_TOK(ctx, TM2_UPD); V[i] = Vo[i] + (unsigned)GET_TOK(ctx, TM2_UPD);
} }
U += Ustride; U += Ustride;
V += Vstride; V += Vstride;