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ffmpeg/libavcodec
Frank Plowman bb69554165 lavc/vvc: Error on inter slice with no reference pics
The semantics of sh_num_ref_idx_active_minus1[ i ] state that

When the current slice is a P slice, the value of NumRefIdxActive[ 0 ] shall be greater than 0.
When the current slice is a B slice, both NumRefIdxActive[ 0 ] and NumRefIdxActive[ 1 ] shall be greater than 0.

Fixes: use of uninitialized memory
Fixes: 449549597/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VVC_fuzzer-5600497089445888

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reported-by: Michael Niedermayer michael@niedermayer.cc
(cherry picked from commit 90f1f797aa)
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