linux-kernel - Re: [PATCH] Bluetooth: prefetch channel before killing sock

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Message-Id: <A08603C3-A9D9-4991-9609-664AF01A77D2@holtmann.org>
Date:   Wed, 5 Feb 2020 09:06:02 +0100
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Hillf Danton <hdanton@...a.com>
Cc:     Bluez mailing list <linux-bluetooth@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Johan Hedberg <johan.hedberg@...il.com>, kuba@...nel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com,
        syzbot+c3c5bdea7863886115dc@...kaller.appspotmail.com,
        Manish Mandlik <mmandlik@...gle.com>
Subject: Re: [PATCH] Bluetooth: prefetch channel before killing sock

Hi Hillf,

> Prefetch channel before killing sock in order to fix UAF like
> 
> BUG: KASAN: use-after-free in l2cap_sock_release+0x24c/0x290 net/bluetooth/l2cap_sock.c:1212
> Read of size 8 at addr ffff8880944904a0 by task syz-fuzzer/9751
> 
> Reported-by: syzbot+c3c5bdea7863886115dc@...kaller.appspotmail.com
> Fixes: 6c08fc896b60 ("Bluetooth: Fix refcount use-after-free issue")
> Cc: Manish Mandlik <mmandlik@...gle.com>
> Signed-off-by: Hillf Danton <hdanton@...a.com>
> ---

patch has been applied to bluetooth-next tree.

Regards

Marcel