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avcodec/webp: Fix signedness in prefix_code check
Fixes: out of array read
Fixes: 1557/clusterfuzz-testcase-minimized-6535013757616128
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 8c5cd1c9d3
)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -694,7 +694,7 @@ static int decode_entropy_coded_image(WebPContext *s, enum ImageRole role,
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length = offset + get_bits(&s->gb, extra_bits) + 1;
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}
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prefix_code = huff_reader_get_symbol(&hg[HUFF_IDX_DIST], &s->gb);
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if (prefix_code > 39) {
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if (prefix_code > 39U) {
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av_log(s->avctx, AV_LOG_ERROR,
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"distance prefix code too large: %d\n", prefix_code);
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return AVERROR_INVALIDDATA;
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