[FFmpeg-devel] [PATCH 3/3] avcodec/leaddec: Check remaining bits in decode_block()

[Michael Niedermayer]

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>
---
 libavcodec/leaddec.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/leaddec.c b/libavcodec/leaddec.c
index ede52fba5a9..4e97479b03c 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;
-- 
2.17.1