linux-kernel - Re: Oops in 4.6-rc2: NULL pointer dereference in cdc-acm

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Date:	Thu, 07 Apr 2016 08:59:38 +0200
From:	Oliver Neukum <oneukum@...e.com>
To:	Gabriele Mazzotta <gabriele.mzt@...il.com>
Cc:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: Oops in 4.6-rc2: NULL pointer dereference in cdc-acm

On Wed, 2016-04-06 at 22:48 +0200, Gabriele Mazzotta wrote:
> Hi,
> 
> I'm getting a kernel oops when I plug some smartphone via USB to my
> laptop, which is currently running the v4.6-rc2.
> 
> The problem seems to be caused by a81cf9799ad7 ("cdc-acm: implement
> put_char() and flush_chars()").
> 
> A simple NULL pointer check prevents the crash, but since I have no
> use of cdc-acm and I didn't read the code, I don't know if some other
> changes are required.
> 
> Here below you can find the change I did to prevent the crash and
> the dmesg showing the problem.

Hi,

thank you for reporting this. You are the second one to report it.
I send a fix upstream last week.
Greg, can we merge this for the next rc? People are hitting this
bug.

	Regards
		Oliver