[FFmpeg-cvslog] avcodec/leaddec: Check remaining bits in decode_block()
Michael Niedermayer
git at videolan.org
Fri Dec 29 03:11:18 EET 2023
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Fri Dec 15 02:18:04 2023 +0100| [d909d8e5e0fbce42ecb10ee6e73def1f1e42ece4] | committer: Michael Niedermayer
avcodec/leaddec: Check remaining bits in decode_block()
Fixes: Timeout
Fixes: 64163/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_LEAD_fuzzer-6418925835124736
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=d909d8e5e0fbce42ecb10ee6e73def1f1e42ece4
---
libavcodec/leaddec.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/libavcodec/leaddec.c b/libavcodec/leaddec.c
index ede52fba5a..4e97479b03 100644
--- a/libavcodec/leaddec.c
+++ b/libavcodec/leaddec.c
@@ -104,6 +104,9 @@ static int decode_block(LeadContext * s, GetBitContext * gb,
s->bdsp.clear_block(block);
+ if (get_bits_left(gb) <= 0)
+ return AVERROR_INVALIDDATA;
+
size = get_vlc2(gb, dc_table, dc_bits, 1);
if (size < 0)
return AVERROR_INVALIDDATA;
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