avcodec/cbs_h265_syntax_template: Limit num_long_term_pics more strictly

The limit is based on hevcdec.c Fixes: 20854/clusterfuzz-testcase-minimized-ffmpeg_BSF_HEVC_METADATA_fuzzer-5160442882424832 Fixes: out of array access Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
5 years ago · 435fa373d1
parent dbacecd347
commit 435fa373d1
1 changed files with 1 additions and 1 deletions
--- a/libavcodec/cbs_h265_syntax_template.c
+++ b/libavcodec/cbs_h265_syntax_template.c
@ -1377,7 +1377,7 @@ static int FUNC(slice_segment_header)(CodedBitstreamContext *ctx, RWContext *rw,
                    infer(num_long_term_sps, 0);
                    idx_size = 0;
                }
-                ue(num_long_term_pics, 0, HEVC_MAX_LONG_TERM_REF_PICS);
+                ue(num_long_term_pics, 0, HEVC_MAX_REFS - current->num_long_term_sps);

                for (i = 0; i < current->num_long_term_sps +
                                current->num_long_term_pics; i++) {