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avcodec/truemotion2: Fix integer overflow in TM2_RECALC_BLOCK()

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Fixes: signed integer overflow: 1477974040 - -1877995504 cannot be represented in type 'int'
Fixes: 4861/clusterfuzz-testcase-minimized-4570316383715328

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-01-20 04:10:50 +01:00
parent 15a05d2b73
commit 56a53340ed
1 changed files with 2 additions and 2 deletions
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libavcodec/truemotion2.c
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@ -441,8 +441,8 @@ static inline int GET_TOK(TM2Context *ctx,int type)
/* recalculate last and delta values for next blocks */
#define TM2_RECALC_BLOCK(CHR, stride, last, CD) {\
CD[0] = CHR[1] - last[1];\
CD[1] = (int)CHR[stride + 1] - (int)CHR[1];\
CD[0] = (unsigned)CHR[ 1] - (unsigned)last[1];\
CD[1] = (unsigned)CHR[stride + 1] - (unsigned) CHR[1];\
last[0] = (int)CHR[stride + 0];\
last[1] = (int)CHR[stride + 1];}