On 5/24/19, Michael Niedermayer <mich...@niedermayer.cc> wrote: > On Sun, Apr 28, 2019 at 12:37:12PM +0200, Paul B Mahol wrote: >> On 4/28/19, Michael Niedermayer <mich...@niedermayer.cc> wrote: >> > Fixes: Timeout (23sec -> 0.5sec) >> > Fixes: >> > 14329/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_LSCR_fuzzer-5679252923482112 >> > >> > Found-by: continuous fuzzing process >> > https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg >> > Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> >> > --- >> > libavcodec/pngdec.c | 2 ++ >> > 1 file changed, 2 insertions(+) >> > >> > diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c >> > index 6a681be29d..1dcde6cbc9 100644 >> > --- a/libavcodec/pngdec.c >> > +++ b/libavcodec/pngdec.c >> > @@ -1541,6 +1541,8 @@ static int decode_frame_lscr(AVCodecContext >> > *avctx, >> > return ret; >> > >> > nb_blocks = bytestream2_get_le16(gb); >> > + if (2 + nb_blocks * 12 > bytestream2_get_bytes_left(gb)) >> >> I prefer if this is not reversed. > > of course, will unreverse and push as "if (bytestream2_get_bytes_left(gb) < > 2 + nb_blocks * 12)" > > thanks
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