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avcodec/xvididct: Fix integer overflow in idct_row()

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Fixes: signed integer overflow: 1871429831 + 343006811 cannot be represented in type 'int'
Fixes: 61784/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AIC_fuzzer-5372151001120768

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 b12444fe72173ab52b6479708cfd12cb889ca300)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2023-09-08 00:13:11 +02:00
parent 242f410a70
commit 83c99e5ac1
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1 changed files with 1 additions and 1 deletions
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libavcodec/xvididct.c
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@ -114,7 +114,7 @@ static int idct_row(short *in, const int *const tab, int rnd)
in[5] = a1;
in[6] = a1;
} else {
const int k = c4 * in[0] + rnd;
const unsigned int k = c4 * in[0] + rnd;
const unsigned int a0 = k + c2 * in[2] + c4 * in[4] + c6 * in[6];
const unsigned int a1 = k + c6 * in[2] - c4 * in[4] - c2 * in[6];
const unsigned int a2 = k - c6 * in[2] - c4 * in[4] + c2 * in[6];