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

[syzbot]

syzbot has bisected this bug to:

commit b9a1e627405d68d475a3c1f35e685ccfb5bbe668
Author: Cong Wang <xiyou.wangcong@xxxxxxxxx>
Date:   Thu Jul 4 00:21:13 2019 +0000

    hsr: implement dellink to clean up resources

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1589f3e8600000
start commit:   1e78030e Merge tag 'mmc-v5.3-rc1' of git://git.kernel.org/..
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=1789f3e8600000
console output: https://syzkaller.appspot.com/x/log.txt?x=1389f3e8600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4c7b914a2680c9c6
dashboard link: https://syzkaller.appspot.com/bug?extid=0a0e5f37746013dc7476
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11fa7830600000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12f31c8a600000

Reported-by: syzbot+0a0e5f37746013dc7476@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: b9a1e627405d ("hsr: implement dellink to clean up resources")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection