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

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Fixes: signed integer overflow: 1077952576 + 1355863565 cannot be represented in type 'int'
Fixes: 16196/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TRUEMOTION2_fuzzer-5679842317565952

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 2b655f55eaf09eb99b5e694dba2c0cf73fa2c646)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-10-26 21:39:41 +02:00
parent 5ebb902caf
commit d7ebf3a074
1 changed files with 3 additions and 3 deletions
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6
libavcodec/truemotion2.c
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@ -560,10 +560,10 @@ static inline void tm2_low_res_block(TM2Context *ctx, AVFrame *pic, int bx, int
deltas[10] = GET_TOK(ctx, TM2_L_LO);
if (bx > 0)
last[0] = (last[-1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3] + last[1]) >> 1;
last[0] = (int)((unsigned)last[-1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3] + last[1]) >> 1;
else
last[0] = (last[1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3])>> 1;
last[2] = (last[1] + last[3]) >> 1;
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];
ctx->D[0] = t1 >> 1;