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Code Issues Releases Activity

avcodec/pixlet: Fix reading invalid numbers of bits

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Fixes: asertion failure
Fixes: 1664/clusterfuzz-testcase-minimized-6587801187385344

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit d32ebce8fd79bb859ba4a04c92470a052f2aafa6)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-05-18 16:51:08 +02:00
parent 686eb3b1ed
commit fc7c379060
1 changed files with 2 additions and 0 deletions
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2
libavcodec/pixlet.c
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@ -229,6 +229,8 @@ static int read_high_coeffs(AVCodecContext *avctx, uint8_t *src, int16_t *dst, i
cnt1 = get_bits(b, nbits);
} else {
pfx = 14 + ((((uint64_t)(value - 14)) >> 32) & (value - 14));
if (pfx < 1 || pfx > 25)
return AVERROR_INVALIDDATA;
cnt1 *= (1 << pfx) - 1;
shbits = show_bits(b, pfx);
if (shbits <= 1) {