linux-kernel - Re: [PATCH v2 1/4] can: kvaser_usb: Don't free packets when tight on URBs

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Message-ID: <20141225093858.GA26583@vivalin-002>
Date:	Thu, 25 Dec 2014 11:38:58 +0200
From:	"Ahmed S. Darwish" <darwish.07@...il.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	Olivier Sobrie <olivier@...rie.be>,
	Oliver Hartkopp <socketcan@...tkopp.net>,
	Wolfgang Grandegger <wg@...ndegger.com>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	"David S. Miller" <davem@...emloft.net>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Linux-CAN <linux-can@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	Linux-stable <stable@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/4] can: kvaser_usb: Don't free packets when tight on
 URBs

On Wed, Dec 24, 2014 at 06:50:11PM -0800, Greg KH wrote:
> On Thu, Dec 25, 2014 at 01:56:44AM +0200, Ahmed S. Darwish wrote:
> > From: Ahmed S. Darwish <ahmed.darwish@...eo.com>
> > 
  > > Flooding the Kvaser CAN to USB dongle with multiple reads and
> > writes in high frequency caused seemingly-random panics in the
> > kernel.
> > 
> > On further inspection, it seems the driver erroneously freed the
> > to-be-transmitted packet upon getting tight on URBs and returning
> > NETDEV_TX_BUSY, leading to invalid memory writes and double frees
> > at a later point in time.
> > 
> > Note:
> > 
> > Finding no more URBs/transmit-contexts and returning NETDEV_TX_BUSY
> > is a driver bug in and out of itself: it means that our start/stop
> > queue flow control is broken.
> > 
> > This patch only fixes the (buggy) error handling code; the root
> > cause shall be fixed in a later commit.
> > 
> > Signed-off-by: Ahmed S. Darwish <ahmed.darwish@...eo.com>
> > ---
> >  drivers/net/can/usb/kvaser_usb.c | 12 ++++++------
> >  1 file changed, 6 insertions(+), 6 deletions(-)
> > 
> >  (Marc, Greg, I believe this should also be added to -stable?)
> 
> 
> <formletter>
> 
> This is not the correct way to submit patches for inclusion in the
> stable kernel tree.  Please read Documentation/stable_kernel_rules.txt
> for how to do this properly.
> 
> </formletter>

<msg-response>

Note taken. Sorry about that ;-)

</msg-response>
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