> -----Original Message----- > From: Cong Wang <xiyou.wangc...@gmail.com> > Sent: 12-Dec-18 01:17 > To: Dmitry Vyukov <dvyu...@google.com> > Cc: syzbot+c56449ed3652e6720...@syzkaller.appspotmail.com; Jon Maloy > <jon.ma...@ericsson.com>; Ying Xue <ying....@windriver.com>; tipc- > discuss...@lists.sourceforge.net; David Miller <da...@davemloft.net>; > Alexey Kuznetsov <kuz...@ms2.inr.ac.ru>; LKML <linux- > ker...@vger.kernel.org>; Linux Kernel Network Developers > <netdev@vger.kernel.org>; syzkaller-b...@googlegroups.com; Hideaki > YOSHIFUJI <yoshf...@linux-ipv6.org> > Subject: Re: KMSAN: uninit-value in __inet6_bind > > On Tue, Dec 11, 2018 at 1:04 AM Dmitry Vyukov <dvyu...@google.com> > wrote: > > > > On Tue, Dec 11, 2018 at 1:41 AM syzbot > > <syzbot+c56449ed3652e6720...@syzkaller.appspotmail.com> wrote: > > > > > > Hello, > > > > > > syzbot found the following crash on: > > > > > > HEAD commit: 3f06bda61398 kmsan: remove excessive KMSAN > wrappers from a.. > > > git tree: https://github.com/google/kmsan.git/master > > > console output: > > > https://syzkaller.appspot.com/x/log.txt?x=13ca6b05400000 > > > kernel config: > > > https://syzkaller.appspot.com/x/.config?x=9b071100dcf8e641 > > > dashboard link: > https://syzkaller.appspot.com/bug?extid=c56449ed3652e6720f30 > > > compiler: clang version 8.0.0 (trunk 348261) > > > > > > Unfortunately, I don't have any reproducer for this crash yet. > > > > > > IMPORTANT: if you fix the bug, please add the following tag to the > commit: > > > Reported-by: syzbot+c56449ed3652e6720...@syzkaller.appspotmail.com > > > > This looks like a bug in TIPC, +TIPC maintainers. > > > > It looks more like udp_sock_create6() doesn't initialize > udp6_addr.sin6_scope_id.
Unfortunately udp_sock_create6() has no way of knowing this value, because struct udp_port_cfg is missing a field sin6_scope_id. So this has to be fixed first by adding this field to the struct, and then setting it correctly in all current users. ///jon
