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

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Message-ID: <20200811065013.GI2026@twin.jikos.cz>
Date:   Tue, 11 Aug 2020 08:50:13 +0200
From:   David Sterba <dsterba@...e.cz>
To:     syzbot <syzbot+7b1677fecb5976b0a099@...kaller.appspotmail.com>
Cc:     clm@...com, davem@...emloft.net, dsterba@...e.com,
        johan.hedberg@...il.com, josef@...icpanda.com, kuba@...nel.org,
        linux-bluetooth@...r.kernel.org, linux-btrfs@...r.kernel.org,
        linux-kernel@...r.kernel.org, marcel@...tmann.org,
        nborisov@...e.com, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Write in hci_conn_del

On Mon, Aug 10, 2020 at 08:35:08PM -0700, syzbot wrote:
> syzbot has bisected this issue to:
> 
> commit 6a3c7f5c87854e948c3c234e5f5e745c7c553722
> Author: Nikolay Borisov <nborisov@...e.com>
> Date:   Thu May 28 08:05:13 2020 +0000
> 
>     btrfs: don't balance btree inode pages from buffered write path

This does not make sense wrt use-after-free in HCI, which is completely
unrelated subsystem.

The patch removes a call to function doing some potentially heavy work,
so this likely affects timing and making the bisection unreliable.