Re: KASAN: use-after-free Read in update_blocked_averages

[syzbot]

syzbot has bisected this bug to:

commit b8a51b38e4d4dec3e379d52c0fe1a66827f7cf1e
Author: Stefano Brivio <sbrivio@xxxxxxxxxx>
Date:   Thu Nov 8 11:19:23 2018 +0000

    fou, fou6: ICMP error handlers for FoU and GUE

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=11e33c17200000
start commit:   b8a51b38 fou, fou6: ICMP error handlers for FoU and GUE
git tree:       net-next
final crash:    https://syzkaller.appspot.com/x/report.txt?x=13e33c17200000
console output: https://syzkaller.appspot.com/x/log.txt?x=15e33c17200000
kernel config:  https://syzkaller.appspot.com/x/.config?x=dcbea7daf3ea3e3e
dashboard link: https://syzkaller.appspot.com/bug?extid=0dbf864d3b52555e8265
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=137ae6d5400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15dbd77b400000

Reported-by: syzbot+0dbf864d3b52555e8265@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: b8a51b38 ("fou, fou6: ICMP error handlers for FoU and GUE")