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SubjectRe: BUG: unable to handle kernel NULL pointer dereference in mem16_serial_out
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syzbot has bisected this bug to:

commit bd94c4077a0b2ecc35562c294f80f3659ecd8499
Author: Masahiro Yamada <yamada.masahiro@socionext.com>
Date: Wed Oct 28 03:46:05 2015 +0000

serial: support 16-bit register interface for console

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13723196e00000
start commit: e42617b8 Linux 5.5-rc1
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=10f23196e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=17723196e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=3754e2c78c1adb82
dashboard link: https://syzkaller.appspot.com/bug?extid=92f32d4e21fb246d31a2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=136f7e41e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=112b7c82e00000

Reported-by: syzbot+92f32d4e21fb246d31a2@syzkaller.appspotmail.com
Fixes: bd94c4077a0b ("serial: support 16-bit register interface for
console")

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

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