ffmpeg | branch: master | Nuo Mi <nuomi2...@gmail.com> | Sun Mar 3 22:04:47 2024 +0800| [72b1237ece9acf509787a68357f4fb0857c893d9] | committer: Nuo Mi
avcodec/vvcdec: fix undefined behaviours for derive_affine_mvc libavcodec/vvc/vvc_inter.c:823:18: runtime error: signed integer overflow: 1426128896 + 1426128896 cannot be represented in type 'int' SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior libavcodec/vvc/vvc_inter.c:823:18 Suggested-by: Andreas Rheinhardt <andreas.rheinha...@outlook.com> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=72b1237ece9acf509787a68357f4fb0857c893d9 --- libavcodec/vvc/vvc_inter.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/libavcodec/vvc/vvc_inter.c b/libavcodec/vvc/vvc_inter.c index d5be32aa14..c5629f7f6f 100644 --- a/libavcodec/vvc/vvc_inter.c +++ b/libavcodec/vvc/vvc_inter.c @@ -817,10 +817,13 @@ static void derive_affine_mvc(MvField *mvc, const VVCFrameContext *fc, const MvF const int vs = fc->ps.sps->vshift[1]; const MvField* mv2 = ff_vvc_get_mvf(fc, x0 + hs * sbw, y0 + vs * sbh); *mvc = *mv; - mvc->mv[0].x += mv2->mv[0].x; - mvc->mv[0].y += mv2->mv[0].y; - mvc->mv[1].x += mv2->mv[1].x; - mvc->mv[1].y += mv2->mv[1].y; + + // Due to different pred_flag, one of the motion vectors may have an invalid value. + // Cast them to an unsigned type to avoid undefined behavior. + mvc->mv[0].x += (unsigned int)mv2->mv[0].x; + mvc->mv[0].y += (unsigned int)mv2->mv[0].y; + mvc->mv[1].x += (unsigned int)mv2->mv[1].x; + mvc->mv[1].y += (unsigned int)mv2->mv[1].y; ff_vvc_round_mv(mvc->mv + 0, 0, 1); ff_vvc_round_mv(mvc->mv + 1, 0, 1); } _______________________________________________ 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".
