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| author | Michael Niedermayer <michael@niedermayer.cc> | 2020-10-23 00:24:01 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2021-09-11 21:23:48 +0200 |
| commit | 9a523ef89f0538cb0b6d8c694188dfa043264872 (patch) | |
| tree | 5770a816444eb3df07ec7250724227f7a5398714 | |
| parent | 9b82853d3ccad8ec2d50b14fb4630b86b74997f7 (diff) | |
| download | ffmpeg-9a523ef89f0538cb0b6d8c694188dfa043264872.tar.gz | |
avcodec/hevc_cabac: Limit value in coeff_abs_level_remaining_decode() tighter
The max depth is 16bps, the max allowed coefficient depth is depth+6
Fixes: signed integer overflow: 1074266112 + 1073725439 cannot be represented in type 'int'
Fixes: 26493/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HEVC_fuzzer-5657763331702784
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 7cf852b03c3ae6b61f89614371d2cb308d0b7f86)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/hevc_cabac.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libavcodec/hevc_cabac.c b/libavcodec/hevc_cabac.c index 8abb780dd7..12fc9f9fdc 100644 --- a/libavcodec/hevc_cabac.c +++ b/libavcodec/hevc_cabac.c @@ -998,7 +998,7 @@ static av_always_inline int coeff_abs_level_remaining_decode(HEVCContext *s, int } else { int prefix_minus3 = prefix - 3; - if (prefix == CABAC_MAX_BIN || prefix_minus3 + rc_rice_param >= 31) { + if (prefix == CABAC_MAX_BIN || prefix_minus3 + rc_rice_param > 16 + 6) { av_log(s->avctx, AV_LOG_ERROR, "CABAC_MAX_BIN : %d\n", prefix); return 0; } |