diff options
| author | Michael Niedermayer <michael@niedermayer.cc> | 2020-06-13 11:21:52 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2020-07-03 12:10:24 +0200 |
| commit | b02ff154022fe275b8cf3fecd55485d502fdec11 (patch) | |
| tree | 6d5f6e826dfcd0a377cd28e2c1fd94bf0d022358 | |
| parent | 99d2024b18771ca9b6db4e917386b7775101fd1e (diff) | |
| download | ffmpeg-b02ff154022fe275b8cf3fecd55485d502fdec11.tar.gz | |
avcodec/pixlet: Fix log(0) check
Fixes: passing zero to clz(), which is not a valid argument
Fixes: 23337/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PIXLET_fuzzer-5179131989065728
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 bd0f81526d3f4c23ecd0a399829103be2445c011)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/pixlet.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libavcodec/pixlet.c b/libavcodec/pixlet.c index 03a2cdacc8..6cb6516227 100644 --- a/libavcodec/pixlet.c +++ b/libavcodec/pixlet.c @@ -221,7 +221,7 @@ static int read_high_coeffs(AVCodecContext *avctx, uint8_t *src, int16_t *dst, length = 25 - nbits; while (i < size) { - if (state >> 8 != -3) + if (((state >> 8) + 3) & 0xFFFFFFF) value = ff_clz((state >> 8) + 3) ^ 0x1F; else value = -1; |