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| author | Michael Niedermayer <michael@niedermayer.cc> | 2018-11-09 21:50:23 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2018-11-13 22:28:12 +0100 |
| commit | 6b4c9854daba2eac01716c3445eb68e6ab8758ba (patch) | |
| tree | ee79f363273714bbed23308bc63bc6e123dc2985 | |
| parent | 3c9c9b1568ef6a9babb4237cf8850017ef547668 (diff) | |
| download | ffmpeg-6b4c9854daba2eac01716c3445eb68e6ab8758ba.tar.gz | |
avcodec/golomb: Speed up long ur_golomb codes
Fixes: Timeout
Fixes: 10972/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FLAC_fuzzer-5707569640243200
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/golomb.h | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/libavcodec/golomb.h b/libavcodec/golomb.h index 5c25883626..fcc78f44c1 100644 --- a/libavcodec/golomb.h +++ b/libavcodec/golomb.h @@ -476,15 +476,19 @@ static inline int get_ur_golomb_jpegls(GetBitContext *gb, int k, int limit, return buf; } else { int i; - for (i = 0; i < limit && SHOW_UBITS(re, gb, 1) == 0; i++) { + for (i = 0; i + MIN_CACHE_BITS <= limit && SHOW_UBITS(re, gb, MIN_CACHE_BITS) == 0; i += MIN_CACHE_BITS) { if (gb->size_in_bits <= re_index) { CLOSE_READER(re, gb); return -1; } - LAST_SKIP_BITS(re, gb, 1); + LAST_SKIP_BITS(re, gb, MIN_CACHE_BITS); UPDATE_CACHE(re, gb); } - SKIP_BITS(re, gb, 1); + for (; i < limit && SHOW_UBITS(re, gb, 1) == 0; i++) { + SKIP_BITS(re, gb, 1); + } + LAST_SKIP_BITS(re, gb, 1); + UPDATE_CACHE(re, gb); if (i < limit - 1) { if (k) { |