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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 17:17:04 +0100 |
| commit | 0e010e489b70c044a67c47083cf8eb03209ee89f (patch) | |
| tree | 88c65187e889ede50e4c9396c975f7aeb2105026 | |
| parent | 47d963335eb2c36c0e6615d7971c762458e813dd (diff) | |
| download | ffmpeg-0e010e489b70c044a67c47083cf8eb03209ee89f.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>
| -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 20dbf63751..0ccaf6b022 100644 --- a/libavcodec/vc1_block.c +++ b/libavcodec/vc1_block.c @@ -889,7 +889,7 @@ static int vc1_decode_i_block_adv(VC1Context *v, int16_t block[64], int n, q2 = FFABS(q2) * 2 + ((q2 < 0) ? 0 : v->halfpq) - 1; if (q2 && q1 != q2) { 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; |