linux-kernel - Re: KASAN: use-after-free Write in hci_sock

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Date:   Sat, 16 May 2020 14:27:03 -0700
From:   syzbot <syzbot+b364ed862aa07c74bc62@...kaller.appspotmail.com>
To:     bigeasy@...utronix.de, davem@...emloft.net, dvyukov@...gle.com,
        jack@...e.cz, johan.hedberg@...il.com,
        linux-bluetooth@...r.kernel.org, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, marcel@...tmann.org, mmarek@...e.com,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de, torvalds@...ux-foundation.org,
        xiyou.wangcong@...il.com
Subject: Re: KASAN: use-after-free Write in hci_sock_release

syzbot suspects this bug was fixed by commit:

commit f1e67e355c2aafeddf1eac31335709236996d2fe
Author: Thomas Gleixner <tglx@...utronix.de>
Date:   Mon Nov 18 13:28:24 2019 +0000

    fs/buffer: Make BH_Uptodate_Lock bit_spin_lock a regular spinlock_t

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1761ce06100000
start commit:   645ff1e8 Merge branch 'for-linus' of git://git.kernel.org/..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=7308e68273924137
dashboard link: https://syzkaller.appspot.com/bug?extid=b364ed862aa07c74bc62
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=152532bb400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13f73320c00000

If the result looks correct, please mark the bug fixed by replying with:

#syz fix: fs/buffer: Make BH_Uptodate_Lock bit_spin_lock a regular spinlock_t

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