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avcodec/truemotion2: Fix several integer overflows in tm2_motion_block() 

Fixes: 15524/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TRUEMOTION2_fuzzer-5173148372172800
Fixes: signed integer overflow: 13701388 - -2134868270 cannot be represented in type 'int'

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 2019-07-08 23:00:09 +02:00
parent 1aad8937f7
commit 9a353ea876
1 changed files with 4 additions and 4 deletions
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8
libavcodec/truemotion2.c
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@ -764,10 +764,10 @@ static inline void tm2_motion_block(TM2Context *ctx, AVFrame *pic, int bx, int b
}
/* calculate deltas */
Y -= Ystride * 4;
ctx->D[0] = Y[3] - last[3];
ctx->D[1] = Y[3 + Ystride] - Y[3];
ctx->D[2] = Y[3 + Ystride * 2] - Y[3 + Ystride];
ctx->D[3] = Y[3 + Ystride * 3] - Y[3 + Ystride * 2];
ctx->D[0] = (unsigned)Y[3] - last[3];
ctx->D[1] = (unsigned)Y[3 + Ystride] - Y[3];
ctx->D[2] = (unsigned)Y[3 + Ystride * 2] - Y[3 + Ystride];
ctx->D[3] = (unsigned)Y[3 + Ystride * 3] - Y[3 + Ystride * 2];
for (i = 0; i < 4; i++)
last[i] = Y[i + Ystride * 3];
}