On Thu, Feb 06, 2020 at 03:27:11PM +0100, Paul B Mahol wrote: > Nonsense, why would this code be called with 0 buffer?
I guess because code calls av_probe_input_format3() with a 0 buffer its a public function and called by multiple places from our code base as well. Theres even code in it to handle the case of a 0 sized input. The code that triggers it in this case seems to be probing the stream content. Its not a 0 byte input file Thanks > > On 2/6/20, Michael Niedermayer <mich...@niedermayer.cc> wrote: > > Fixes: division by zero > > Fixes: > > 20436/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5763229752229888 > > > > Found-by: continuous fuzzing process > > https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg > > Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> > > --- > > libavformat/tty.c | 3 +++ > > 1 file changed, 3 insertions(+) > > > > diff --git a/libavformat/tty.c b/libavformat/tty.c > > index 60f7e9f87e..854a23c500 100644 > > --- a/libavformat/tty.c > > +++ b/libavformat/tty.c > > @@ -53,6 +53,9 @@ static int read_probe(const AVProbeData *p) > > { > > int cnt = 0; > > > > + if (!p->buf_size) > > + return 0; > > + > > for (int i = 0; i < p->buf_size; i++) > > cnt += !!isansicode(p->buf[i]); > > > > -- > > 2.17.1 > > > > _______________________________________________ > > 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". -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB No great genius has ever existed without some touch of madness. -- Aristotle
signature.asc
Description: PGP signature
_______________________________________________ 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".
