mirror of https://git.ffmpeg.org/ffmpeg.git
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>
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@ -221,7 +221,7 @@ static int read_high_coeffs(AVCodecContext *avctx, uint8_t *src, int16_t *dst,
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length = 25 - nbits;
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length = 25 - nbits;
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while (i < size) {
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while (i < size) {
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if (state >> 8 != -3)
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if (((state >> 8) + 3) & 0xFFFFFFF)
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value = ff_clz((state >> 8) + 3) ^ 0x1F;
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value = ff_clz((state >> 8) + 3) ^ 0x1F;
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else
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else
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value = -1;
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value = -1;
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