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avcodec/clearvideo: Fix runtime error: signed integer overflow: 181 * 18050756 cannot be represented in type 'int'

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Fixes: 1417/clusterfuzz-testcase-minimized-6606778030620672

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 2017-05-09 00:14:44 +02:00
parent 159fb8ff7e
commit 28230a690e
1 changed files with 2 additions and 2 deletions
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4
libavcodec/clearvideo.c
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@ -189,8 +189,8 @@ static inline int decode_block(CLVContext *ctx, int16_t *blk, int has_ac,
const int t7 = ((blk[0 * step] - blk[4 * step]) * (1 << dshift)) + bias; \
const int t8 = t0 + t2; \
const int t9 = t0 - t2; \
const int tA = 181 * (t9 + (t1 - t3)) + 0x80 >> 8; \
const int tB = 181 * (t9 - (t1 - t3)) + 0x80 >> 8; \
const int tA = (int)(181U * (t9 + (t1 - t3)) + 0x80) >> 8; \
const int tB = (int)(181U * (t9 - (t1 - t3)) + 0x80) >> 8; \
const int tC = t1 + t3; \
\
blk[0 * step] = (t6 + t5 + t8) >> shift; \