Re: KASAN: use-after-free Write in hci_conn_del

From: David Sterba
Date: Tue Aug 11 2020 - 02:51:18 EST


On Mon, Aug 10, 2020 at 08:35:08PM -0700, syzbot wrote:
> syzbot has bisected this issue to:
>
> commit 6a3c7f5c87854e948c3c234e5f5e745c7c553722
> Author: Nikolay Borisov <nborisov@xxxxxxxx>
> 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.