[FFmpeg-devel] [PATCH 2/2] avcodec/cbs_vp9: Check data_size

[Michael Niedermayer]

Fixes: out of array access
Fixes: 19542/clusterfuzz-testcase-minimized-ffmpeg_BSF_TRACE_HEADERS_fuzzer-5659498341728256

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/cbs_vp9.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/cbs_vp9.c b/libavcodec/cbs_vp9.c
index 98730e03e3..ec82f11c76 100644
--- a/libavcodec/cbs_vp9.c
+++ b/libavcodec/cbs_vp9.c
@@ -416,6 +416,9 @@ static int cbs_vp9_split_fragment(CodedBitstreamContext *ctx,
     uint8_t superframe_header;
     int err;
 
+    if (frag->data_size == 0)
+        return AVERROR_INVALIDDATA;
+
     // Last byte in the packet.
     superframe_header = frag->data[frag->data_size - 1];
 
-- 
2.24.0