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| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-08-15 18:47:54 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2020-01-06 11:30:42 +0100 |
| commit | 58a7f109a96cda2f461197f6ded4951387d7fee3 (patch) | |
| tree | df362a971f3cb270c3f5f2bd279e247ae4cd6736 | |
| parent | 586a79190ccc56ab1ba682127a23e6b411d88c51 (diff) | |
| download | ffmpeg-58a7f109a96cda2f461197f6ded4951387d7fee3.tar.gz | |
avcodec/vc1_block: Check for double escapes
Fixes: out of array read
Fixes: 16331/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMV3IMAGE_fuzzer-5672735195267072
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 6962fd586e1a9a98828866dcfb4114af30c8c756)
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 94184b0873..775e3c516b 100644 --- a/libavcodec/vc1_block.c +++ b/libavcodec/vc1_block.c @@ -526,7 +526,7 @@ static int vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip, int escape = decode210(gb); if (escape != 2) { index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3); - if (index < 0) + if (index >= ff_vc1_ac_sizes[codingset] - 1U) return AVERROR_INVALIDDATA; run = vc1_index_decode_table[codingset][index][0]; level = vc1_index_decode_table[codingset][index][1]; |