[FFmpeg-devel] [PATCH 1/2] avformat/matroskadec: Fix infinite loop with bz decompression

[Michael Niedermayer]

Fixes: Infinite loop
Fixes: 43932/clusterfuzz-testcase-minimized-ffmpeg_dem_MATROSKA_fuzzer-6175167573786624

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavformat/matroskadec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index d165f6ab90..5a9acfb247 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -1742,7 +1742,7 @@ static int matroska_decode_buffer(uint8_t **buf, int *buf_size,
     case MATROSKA_TRACK_ENCODING_COMP_BZLIB:
     {
         bz_stream bzstream = { 0 };
-        if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
+        if (!pkt_size || BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
             return -1;
         bzstream.next_in  = data;
         bzstream.avail_in = isize;
-- 
2.17.1