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| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-11-08 18:31:02 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2019-12-01 17:54:30 +0100 |
| commit | 5b43aa7a80f5ddaa46fec9866061a7c0e0d7f72e (patch) | |
| tree | cd60c7070cd6198aa06e72e8aa14b5fc0e50d58e | |
| parent | 2f942ddf7415baa55bdd4e60038526c35571b0c5 (diff) | |
| download | ffmpeg-5b43aa7a80f5ddaa46fec9866061a7c0e0d7f72e.tar.gz | |
avcodec/vc1_block: Fix integer overflow in AC rescaling in vc1_decode_i_block_adv()
Fixes: signed integer overflow: 50176 * 262144 cannot be represented in type 'int'
Fixes: 18629/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VC1IMAGE_fuzzer-5182370286403584
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 0e010e489b70c044a67c47083cf8eb03209ee89f)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/vc1_block.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libavcodec/vc1_block.c b/libavcodec/vc1_block.c index b4a674978f..976d330935 100644 --- a/libavcodec/vc1_block.c +++ b/libavcodec/vc1_block.c @@ -867,7 +867,7 @@ static int vc1_decode_i_block_adv(VC1Context *v, int16_t block[64], int n, if (q1 < 1) return AVERROR_INVALIDDATA; for (k = 1; k < 8; k++) - ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18; + ac_val2[k] = (int)(ac_val2[k] * q2 * (unsigned)ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18; } for (k = 1; k < 8; k++) { block[k << sh] = ac_val2[k] * scale; |