On Wed, Oct 14, 2020 at 07:54:34PM +0200, Paul B Mahol wrote: > On Wed, Oct 14, 2020 at 05:53:07PM +0200, Michael Niedermayer wrote: > > Fixes: OOM > > Fixes: > > 26168/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_NOTCHLC_fuzzer-6019839015256064 > > > > 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..0254e7d76a 100644 > > --- a/libavcodec/notchlc.c > > +++ b/libavcodec/notchlc.c > > @@ -490,6 +490,9 @@ static int decode_frame(AVCodecContext *avctx, > > > > bytestream2_init(gb, s->lzf_buffer, uncompressed_size); > > } else if (s->format == 1) { > > + if (bytestream2_get_bytes_left(gb) < uncompressed_size / 255) > > From where you picked this division? And expecially 255 number?
from a look at lz4_decompress(), it appeared to me that the amount of bytes output is encoded so that each 255 bytes output require a byte input. So the output would be bound to 255 times the input size Did i miss something ? thx [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB it is not once nor twice but times without number that the same ideas make their appearance in the world. -- Aristotle
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