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avcodec/wmv2dsp: Fix runtime error: signed integer overflow: 181 * -17047030 cannot be represented in type 'int'

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Fixes: 1503/clusterfuzz-testcase-minimized-5369271855087616

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 2017-05-12 13:05:46 +02:00
parent eaf644e120
commit df640dbbc9
1 changed files with 2 additions and 2 deletions
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4
libavcodec/wmv2dsp.c
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@ -48,8 +48,8 @@ static void wmv2_idct_row(short * b)
a4 = W0 * b[0] - W0 * b[4];
/* step 2 */
s1 = (181 * (a1 - a5 + a7 - a3) + 128) >> 8; // 1, 3, 5, 7
s2 = (181 * (a1 - a5 - a7 + a3) + 128) >> 8;
s1 = (int)(181U * (a1 - a5 + a7 - a3) + 128) >> 8; // 1, 3, 5, 7
s2 = (int)(181U * (a1 - a5 - a7 + a3) + 128) >> 8;
/* step 3 */
b[0] = (a0 + a2 + a1 + a5 + (1 << 7)) >> 8;