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Date:   Thu, 3 Jan 2019 13:41:43 -0600
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     syzbot <syzbot+4ad25edc7a33e4ab91e0@...kaller.appspotmail.com>
Cc:     David Miller <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        syzkaller-bugs@...glegroups.com,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>, sbrivio@...hat.com
Subject: Re: kernel panic: stack is corrupted in udp4_lib_lookup2

On Thu, Jan 3, 2019 at 1:39 PM Willem de Bruijn
<willemdebruijn.kernel@...il.com> wrote:
>
> On Thu, Jan 3, 2019 at 7:07 AM syzbot
> <syzbot+4ad25edc7a33e4ab91e0@...kaller.appspotmail.com> wrote:
> >
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit:    195303136f19 Merge tag 'kconfig-v4.21-2' of git://git.kern..
> > git tree:       upstream
> > console output: https://syzkaller.appspot.com/x/log.txt?x=12245d8f400000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=5e7dc790609552d7
> > dashboard link: https://syzkaller.appspot.com/bug?extid=4ad25edc7a33e4ab91e0
> > compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
> >
> > 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+4ad25edc7a33e4ab91e0@...kaller.appspotmail.com
> >
> > protocol 88fb is buggy, dev hsr_slave_1
> > protocol 88fb is buggy, dev hsr_slave_0
> > protocol 88fb is buggy, dev hsr_slave_1
> > FAT-fs (loop0): invalid media value (0x00)
> > FAT-fs (loop0): Can't find a valid FAT filesystem
> > Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in:
>
> This sounds similar to the stack corruption fixed recently in commit
> e7cc082455cb ("udp: Support for error handlers of tunnels ...").
>
> That fix is for ipv4 gue_err(). ipv6 gue6_err() probably needs the same.

Correction. The fix is 11789039da ("fou: prevent unbounded recursion
in GUE error handler")

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