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avcodec/vp9dsp_template: Fix integer overflow in iadst8_1d()

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Fixes: signed integer overflow: 998938090 + 1169275991 cannot be represented in type 'int'
Fixes: 23411/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VP9_fuzzer-4644692330545152

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-06-22 00:24:55 +02:00
parent cf0c700b0c
commit d182d8f10c
1 changed files with 8 additions and 8 deletions
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16
libavcodec/vp9dsp_template.c
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@ -1260,20 +1260,20 @@ static av_always_inline void iadst8_1d(const dctcoef *in, ptrdiff_t stride,
t6 = (t2a - t6a + (1 << 13)) >> 14; t6 = (t2a - t6a + (1 << 13)) >> 14;
t7 = (t3a - t7a + (1 << 13)) >> 14; t7 = (t3a - t7a + (1 << 13)) >> 14;
t4a = 15137 * t4 + 6270 * t5; t4a = 15137U * t4 + 6270U * t5;
t5a = 6270 * t4 - 15137 * t5; t5a = 6270U * t4 - 15137U * t5;
t6a = 15137 * t7 - 6270 * t6; t6a = 15137U * t7 - 6270U * t6;
t7a = 6270 * t7 + 15137 * t6; t7a = 6270U * t7 + 15137U * t6;
out[0] = t0 + t2; out[0] = t0 + t2;
out[7] = -(t1 + t3); out[7] = -(t1 + t3);
t2 = t0 - t2; t2 = t0 - t2;
t3 = t1 - t3; t3 = t1 - t3;
out[1] = -((t4a + t6a + (1 << 13)) >> 14); out[1] = -((dctint)((1U << 13) + t4a + t6a) >> 14);
out[6] = (t5a + t7a + (1 << 13)) >> 14; out[6] = (dctint)((1U << 13) + t5a + t7a) >> 14;
t6 = (t4a - t6a + (1 << 13)) >> 14; t6 = (dctint)((1U << 13) + t4a - t6a) >> 14;
t7 = (t5a - t7a + (1 << 13)) >> 14; t7 = (dctint)((1U << 13) + t5a - t7a) >> 14;
out[3] = -(((t2 + t3) * 11585 + (1 << 13)) >> 14); out[3] = -(((t2 + t3) * 11585 + (1 << 13)) >> 14);
out[4] = ((t2 - t3) * 11585 + (1 << 13)) >> 14; out[4] = ((t2 - t3) * 11585 + (1 << 13)) >> 14;