sön 2022-09-18 klockan 19:13 +0200 skrev Michael Niedermayer: > Fixes: signed integer overflow: 9223372036854775807 - -2146905566 > cannot be represented in type 'long' > Fixes: 50993/clusterfuzz-testcase-minimized-ffmpeg_dem_MXF_fuzzer- > 6570996594769920 > > Found-by: continuous fuzzing process > https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg > Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> > --- > libavformat/mxfdec.c | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > > diff --git a/libavformat/mxfdec.c b/libavformat/mxfdec.c > index e63e803aa56..da81fea3bc1 100644 > --- a/libavformat/mxfdec.c > +++ b/libavformat/mxfdec.c > @@ -3681,6 +3681,7 @@ static int mxf_read_header(AVFormatContext *s) > KLVPacket klv; > int64_t essence_offset = 0; > int ret; > + int64_t run_in; > > mxf->last_forward_tell = INT64_MAX; > > @@ -3690,7 +3691,10 @@ static int mxf_read_header(AVFormatContext *s) > } > avio_seek(s->pb, -14, SEEK_CUR); > mxf->fc = s; > - mxf->run_in = avio_tell(s->pb); > + run_in = avio_tell(s->pb); > + if (run_in < 0 || run_in != (int)run_in)
run_in > INT_MAX is more clear It strikes me that run_in is also used in lots of places in the demuxer without checking for overflow /Tomas _______________________________________________ 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".
