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avcodec/takdec: Fix integer overflow in decode_subframe()

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Fixes: runtime error: signed integer overflow: -536870912 - 1972191120 cannot be represented in type 'int'
Fixes: 2711/clusterfuzz-testcase-minimized-4975142398590976

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 2c630d159f)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2017-07-27 23:49:26 +02:00
parent 06ce68d8a0
commit 6274709c1c
1 changed files with 1 additions and 1 deletions
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libavcodec/takdec.c
+1 -1
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@@ -489,7 +489,7 @@ static int decode_subframe(TAKDecContext *s, int32_t *decoded,
s->residues[i + j + 1] * s->filter[j + 1] +
s->residues[i + j ] * s->filter[j ];
}
v = (av_clip_intp2(v >> filter_quant, 13) * (1 << dshift)) - *decoded;
v = (av_clip_intp2(v >> filter_quant, 13) * (1 << dshift)) - (unsigned)*decoded;
*decoded++ = v;
s->residues[filter_order + i] = v >> dshift;
}