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avcodec/diracdsp: fix integer overflow

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Fixes: runtime error: signed integer overflow: 11 * 225726413 cannot be represented in type 'int'
Fixes: 2764/clusterfuzz-testcase-minimized-5382561922547712

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 b2d9d72269)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-07-29 15:55:36 +02:00
parent 892ceb512f
commit 19938f1a11
1 changed files with 1 additions and 1 deletions
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libavcodec/diracdsp.c
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@ -199,7 +199,7 @@ static void dequant_subband_ ## PX ## _c(uint8_t *src, uint8_t *dst, ptrdiff_t s
for (i = 0; i < tot_h; i++) { \
c = *src_r++; \
sign = FFSIGN(c)*(!!c); \
c = (FFABS(c)*qf + qs) >> 2; \
c = (FFABS(c)*(unsigned)qf + qs) >> 2; \
*dst_r++ = c*sign; \
} \
src += tot_h << (sizeof(PX) >> 1); \