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avcodec/fic: Check coefficients 

Fixes: signed integer overflow: 1258291200 * 2 cannot be represented in type 'int'
Fixes: 1413/clusterfuzz-testcase-minimized-5923451770503168

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-05-08 21:32:56 +02:00
parent d3088e0fd8
commit 548459080b
1 changed files with 6 additions and 2 deletions
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8
libavcodec/fic.c
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@ -150,9 +150,13 @@ static int fic_decode_block(FICContext *ctx, GetBitContext *gb,
if (num_coeff > 64)
return AVERROR_INVALIDDATA;
for (i = 0; i < num_coeff; i++)
block[ff_zigzag_direct[i]] = get_se_golomb(gb) *
for (i = 0; i < num_coeff; i++) {
int v = get_se_golomb(gb);
if (v < -2048 || v > 2048)
return AVERROR_INVALIDDATA;
block[ff_zigzag_direct[i]] = v *
ctx->qmat[ff_zigzag_direct[i]];
}
fic_idct_put(dst, stride, block);