ffmpeg | branch: master | Frank Plowman <p...@frankplowman.com> | Sat May 17 21:52:48 2025 +0100| [670089304ac856f01591c88bbb7c115d423935da] | committer: Nuo Mi
lavc/vvc: Avoid UB in DB strength derivation for PLT CUs When called for palette-predicted CUs, boundary_strength could cause undefined behaviour due to accessing uninitialised motion information. The spec doesn't include this, but in the reference software it seems the deblock strength is always set to 0 for palette CUs due to some implementation details: perhaps this is a spec issue? Signed-off-by: Frank Plowman <p...@frankplowman.com> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=670089304ac856f01591c88bbb7c115d423935da --- libavcodec/vvc/filter.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/libavcodec/vvc/filter.c b/libavcodec/vvc/filter.c index e3886d008e..3815668bcf 100644 --- a/libavcodec/vvc/filter.c +++ b/libavcodec/vvc/filter.c @@ -385,6 +385,9 @@ static int boundary_strength(const VVCLocalContext *lc, const MvField *curr, con { RefPicList *rpl = lc->sc->rpl; + if (curr->pred_flag == PF_PLT) + return 0; + if (curr->pred_flag == PF_IBC) return FFABS(neigh->mv[0].x - curr->mv[0].x) >= 8 || FFABS(neigh->mv[0].y - curr->mv[0].y) >= 8; _______________________________________________ ffmpeg-cvslog mailing list ffmpeg-cvslog@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog To unsubscribe, visit link above, or email ffmpeg-cvslog-requ...@ffmpeg.org with subject "unsubscribe".
