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avcodec/cbs_h265_syntax_template: Limit num_long_term_pics more strictly

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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>
(cherry picked from commit 435fa373d1f5045b17de74934e44863e2fb3071f)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-04-20 23:27:04 +02:00
parent b2116b438e
commit 6f582f69df
1 changed files with 1 additions and 1 deletions
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libavcodec/cbs_h265_syntax_template.c
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@ -1321,7 +1321,7 @@ 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++) {