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

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Message-ID: <20160407144705.GE10853@kroah.com>
Date:	Thu, 7 Apr 2016 07:47:05 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Oliver Neukum <oneukum@...e.com>
Cc:	Gabriele Mazzotta <gabriele.mzt@...il.com>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: Oops in 4.6-rc2: NULL pointer dereference in cdc-acm

On Thu, Apr 07, 2016 at 08:59:38AM +0200, Oliver Neukum wrote:
> 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.

Yes, will be sent this week, sorry for the delay.

greg k-h