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avcodec/vp9dsp_template: Fix some overflows in iadst8_1d() 

Fixes: signed integer overflow: 190587 * 11585 cannot be represented in type 'int'
Fixes: 26407/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VP9_fuzzer-5086348408782848

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 bca0735be5)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-10-18 22:04:14 +02:00
parent d3595579ca
commit 4d5d82314f
1 changed files with 4 additions and 4 deletions
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8
libavcodec/vp9dsp_template.c
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@ -1275,10 +1275,10 @@ static av_always_inline void iadst8_1d(const dctcoef *in, ptrdiff_t stride,
t6 = (dctint)((1U << 13) + t4a - t6a) >> 14; t6 = (dctint)((1U << 13) + t4a - t6a) >> 14;
t7 = (dctint)((1U << 13) + t5a - t7a) >> 14; t7 = (dctint)((1U << 13) + t5a - t7a) >> 14;
out[3] = -(((t2 + t3) * 11585 + (1 << 13)) >> 14); out[3] = -((dctint)((t2 + t3) * 11585U + (1 << 13)) >> 14);
out[4] = ((t2 - t3) * 11585 + (1 << 13)) >> 14; out[4] = (dctint)((t2 - t3) * 11585U + (1 << 13)) >> 14;
out[2] = ((t6 + t7) * 11585 + (1 << 13)) >> 14; out[2] = (dctint)((t6 + t7) * 11585U + (1 << 13)) >> 14;
out[5] = -(((t6 - t7) * 11585 + (1 << 13)) >> 14); out[5] = -((dctint)((t6 - t7) * 11585U + (1 << 13)) >> 14);
} }
itxfm_wrap(8, 5) itxfm_wrap(8, 5)