On Sun, Sep 13, 2020 at 03:53:18PM +0200, Michael Niedermayer wrote: > On Sun, Sep 13, 2020 at 12:39:34AM +0200, Paul B Mahol wrote: > > On Sat, Sep 12, 2020 at 06:43:30PM +0200, Michael Niedermayer wrote: > > > Fixes: Timeout (too long -> 2sec) > > > Fixes: > > > 25439/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_NOTCHLC_fuzzer-5688211127664640 > > > > > > Found-by: continuous fuzzing process > > > https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg > > > Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> > > > --- > > > libavcodec/notchlc.c | 3 +++ > > > 1 file changed, 3 insertions(+) > > > > > > diff --git a/libavcodec/notchlc.c b/libavcodec/notchlc.c > > > index 3f7079da70..e7e69b0c21 100644 > > > --- a/libavcodec/notchlc.c > > > +++ b/libavcodec/notchlc.c > > > @@ -229,6 +229,9 @@ static int decode_blocks(AVCodecContext *avctx, > > > AVFrame *p, ThreadFrame *frame, > > > bytestream2_seek(&rgb, s->y_data_row_offsets, SEEK_SET); > > > bytestream2_seek(gb, s->y_control_data_offset, SEEK_SET); > > > > > > + if ((avctx->height + 3) / 4 * ((avctx->width + 3) / 4) * 4 > > > > bytestream2_get_bytes_left(gb)) > > > + return AVERROR_INVALIDDATA; > > > + > > > dsty = (uint16_t *)p->data[0]; > > > dsta = (uint16_t *)p->data[3]; > > > ylinesize = p->linesize[0] / 2; > > > -- > > > 2.17.1 > > > > Is this correct at all? > > Its the amount that is read from gb in the next loop just below the added > check
There is also alpha handling code. Also I dislike completely this reverse style, bytestream2.. should be first. With that fixed and actually tested that it does not break decoding it should be fine. > > thx > > > > > If you do not like timeouts than get smaller samples or reduce dimensions > > of accepted files. > > _______________________________________________ > > ffmpeg-devel mailing list > > ffmpeg-devel@ffmpeg.org > > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > > > To unsubscribe, visit link above, or email > > ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe". > > -- > Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB > > There will always be a question for which you do not know the correct answer. > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > To unsubscribe, visit link above, or email > ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe". _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
