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| author | Michael Niedermayer <michael@niedermayer.cc> | 2018-01-15 23:46:44 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2018-01-31 23:47:15 +0100 |
| commit | c740f585a183abccd0ffc9cce67989b4bb0d08b9 (patch) | |
| tree | 6a0bf65788ed4dfbe9c6302e7627fb8f5c154d50 | |
| parent | c1f7b2b6e18acf0b24fcac32027e5ca45e3b5945 (diff) | |
| download | ffmpeg-c740f585a183abccd0ffc9cce67989b4bb0d08b9.tar.gz | |
avcodec/hevc_cabac: Check prefix so as to avoid invalid shifts in coeff_abs_level_remaining_decode()
I suspect that this can be limited tighter, but i failed to find anything
in the spec that would confirm that.
Fixes: 4833/clusterfuzz-testcase-minimized-5302840101699584
Fixes: runtime error: left shift of 134217730 by 4 places cannot be represented in type 'int'
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 a026a3efaeb9c2026668dccbbda339a21ab3206b)
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 c9525596bc..0e4c522bb1 100644 --- a/libavcodec/hevc_cabac.c +++ b/libavcodec/hevc_cabac.c @@ -985,7 +985,7 @@ static av_always_inline int coeff_abs_level_remaining_decode(HEVCContext *s, int } else { int prefix_minus3 = prefix - 3; - if (prefix == CABAC_MAX_BIN) { + if (prefix == CABAC_MAX_BIN || prefix_minus3 + rc_rice_param >= 31) { av_log(s->avctx, AV_LOG_ERROR, "CABAC_MAX_BIN : %d\n", prefix); return 0; } |