Fixes: shift exponent -1 is negative Fixes: 63889/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-6009343056936960
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> --- libavcodec/jpegxl_parser.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/libavcodec/jpegxl_parser.c b/libavcodec/jpegxl_parser.c index 630fc8a60bf..964f5a9ad5a 100644 --- a/libavcodec/jpegxl_parser.c +++ b/libavcodec/jpegxl_parser.c @@ -698,6 +698,10 @@ static int read_vlc_prefix(GetBitContext *gb, JXLEntropyDecoder *dec, JXLSymbolD level1_codecounts[0] = hskip; for (int i = hskip; i < 18; i++) { len = level1_lens[prefix_codelen_map[i]] = get_vlc2(gb, level0_table, 4, 1); + if (len < 0) { + ret = AVERROR_INVALIDDATA; + goto end; + } level1_codecounts[len]++; if (len) { total_code += (32 >> len); @@ -743,6 +747,10 @@ static int read_vlc_prefix(GetBitContext *gb, JXLEntropyDecoder *dec, JXLSymbolD total_code = 0; for (int i = 0; i < dist->alphabet_size; i++) { len = get_vlc2(gb, level1_vlc.table, 5, 1); + if (len < 0) { + ret = AVERROR_INVALIDDATA; + goto end; + } if (get_bits_left(gb) < 0) { ret = AVERROR_BUFFER_TOO_SMALL; goto end; -- 2.17.1 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
