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avcodec/wmalosslessdec: Fixes undefined overflow in dequantization in decode_subframe()

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Fixes: signed integer overflow: 47875596 * 45 cannot be represented in type 'int'
Fixes: 19082/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMALOSSLESS_fuzzer-5687766512041984

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
2019-11-29 22:45:07 +01:00
parent aea6755611
commit 53efab44a9
1 changed files with 1 additions and 1 deletions
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libavcodec/wmalosslessdec.c
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@@ -979,7 +979,7 @@ static int decode_subframe(WmallDecodeCtx *s)
if (s->quant_stepsize != 1) if (s->quant_stepsize != 1)
for (i = 0; i < s->num_channels; i++) for (i = 0; i < s->num_channels; i++)
for (j = 0; j < subframe_len; j++) for (j = 0; j < subframe_len; j++)
s->channel_residues[i][j] *= s->quant_stepsize; s->channel_residues[i][j] *= (unsigned)s->quant_stepsize;
} }
/* Write to proper output buffer depending on bit-depth */ /* Write to proper output buffer depending on bit-depth */