[FFmpeg-devel] [PATCH 3/4] avformat/mxfdec: Ensure klv->key is initialized
Michael Niedermayer
michael at niedermayer.cc
Wed Jul 23 14:45:39 EEST 2025
Fixes: read of uninitialized memory
Fixes: 391916474/clusterfuzz-testcase-minimized-ffmpeg_dem_MXF_fuzzer-4935250956845056
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/mxfdec.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/libavformat/mxfdec.c b/libavformat/mxfdec.c
index 0eed13d850d..184e97256cd 100644
--- a/libavformat/mxfdec.c
+++ b/libavformat/mxfdec.c
@@ -491,7 +491,9 @@ static int klv_read_packet(MXFContext *mxf, KLVPacket *klv, AVIOContext *pb)
return AVERROR_INVALIDDATA;
memcpy(klv->key, mxf_klv_key, 4);
- avio_read(pb, klv->key + 4, 12);
+ int ret = ffio_read_size(pb, klv->key + 4, 12);
+ if (ret < 0)
+ return ret;
length = klv_decode_ber_length(pb, &llen);
if (length < 0)
return length;
--
2.50.1
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