linux-kernel - RE: [v6.1.52][PATCH] Bluetooth: btsdio: fix use after free bug in btsdio

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Date:   Fri, 8 Sep 2023 04:18:07 +0000
From:   "Deepak Rathore -X (deeratho - E-INFO CHIPS INC at Cisco)" 
        <deeratho@...co.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [v6.1.52][PATCH] Bluetooth: btsdio: fix use after free bug in
 btsdio_remove due to race condition

Hi Greg,

I want to merge this change into v6.1.52 stable kernel version.

I have added these details in my patch subject message. Sorry for inconvenience.

Thanks & Regards,
Deepak
-----Original Message-----
From: Greg KH <gregkh@...uxfoundation.org> 
Sent: Thursday, September 7, 2023 3:47 PM
To: Deepak Rathore -X (deeratho - E-INFO CHIPS INC at Cisco) <deeratho@...co.com>
Cc: stable@...r.kernel.org; linux-kernel@...r.kernel.org
Subject: Re: [v6.1.52][PATCH] Bluetooth: btsdio: fix use after free bug in btsdio_remove due to race condition

On Wed, Sep 06, 2023 at 05:45:25PM +0530, Deepak Rathore wrote:
> From: Zheng Wang <zyytlz.wz@....com>
> 
> [ Upstream commit 73f7b171b7c09139eb3c6a5677c200dc1be5f318 ]
> 
> In btsdio_probe, the data->work is bound with btsdio_work. It will be 
> started in btsdio_send_frame.
> 
> If the btsdio_remove runs with a unfinished work, there may be a race 
> condition that hdev is freed but used in btsdio_work. Fix it by 
> canceling the work before do cleanup in btsdio_remove.
> 
> Signed-off-by: Zheng Wang <zyytlz.wz@....com>
> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>
> Signed-off-by: Deepak Rathore <deeratho@...co.com>
> 

What tree(s) are you wanting this applied to?

thanks,

greg k-h