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lavc/vvc: Error on inter slice with no reference pics

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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
This commit is contained in:
Frank Plowman
2025-12-24 15:35:06 +00:00
committed by James Almer
parent 0dfaed77a6
commit 90f1f797aa
1 changed files with 6 additions and 0 deletions
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6
libavcodec/cbs_h266_syntax_template.c
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@@ -3248,6 +3248,12 @@ static int FUNC(slice_header) (CodedBitstreamContext *ctx, RWContext *rw,
FFMIN(ref_pic_lists->rpl_ref_list[i].num_ref_entries,
pps->pps_num_ref_idx_default_active_minus1[i] + 1);
}
if (current->num_ref_idx_active[i] <= 0) {
av_log(ctx->log_ctx, AV_LOG_ERROR,
"Inter slice but no reference pictures available for RPL%d.\n", i);
return AVERROR_INVALIDDATA;
}
} else {
current->num_ref_idx_active[i] = 0;
}