[FFmpeg-devel] [PATCH 1/2] avcodec/cbs_h265_syntax_template: Better check for num_long_term_sps

[Michael Niedermayer]

Fixes: index 26 out of bounds for type 'uint8_t [16]'
Fixes: 24913/clusterfuzz-testcase-minimized-ffmpeg_BSF_HEVC_METADATA_fuzzer-6261760693370880

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_h265_syntax_template.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/cbs_h265_syntax_template.c b/libavcodec/cbs_h265_syntax_template.c
index 48fae82d04..8eb6e159f4 100644
--- a/libavcodec/cbs_h265_syntax_template.c
+++ b/libavcodec/cbs_h265_syntax_template.c
@@ -1405,6 +1405,8 @@ static int FUNC(slice_segment_header)(CodedBitstreamContext *ctx, RWContext *rw,
                     infer(num_long_term_sps, 0);
                     idx_size = 0;
                 }
+                if (HEVC_MAX_REFS < current->num_long_term_sps)
+                    return AVERROR_INVALIDDATA;
                 ue(num_long_term_pics, 0, HEVC_MAX_REFS - current->num_long_term_sps);
 
                 for (i = 0; i < current->num_long_term_sps +
-- 
2.17.1