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avcodec/proresdec2: SKIP_BITS() does not work with len=32

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Fixes: invalid shift
Fixes: 3482/clusterfuzz-testcase-minimized-5446915875405824

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 c37138e01a)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-10-02 04:18:22 +02:00
parent c665a93438
commit df66540dd5
1 changed files with 1 additions and 1 deletions
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2
libavcodec/proresdec2.c
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@ -264,7 +264,7 @@ static int decode_picture_header(AVCodecContext *avctx, const uint8_t *buf, cons
\
if (q > switch_bits) { /* exp golomb */ \
bits = exp_order - switch_bits + (q<<1); \
if (bits > MIN_CACHE_BITS) \
if (bits > FFMIN(MIN_CACHE_BITS, 31)) \
return AVERROR_INVALIDDATA; \
val = SHOW_UBITS(re, gb, bits) - (1 << exp_order) + \
((switch_bits + 1) << rice_order); \