linux-kernel - Re: [PATCH v3 1/4] can: kvaser_usb: Don't free packets when tight on URBs

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Message-ID: <54AE550D.2090603@pengutronix.de>
Date:	Thu, 08 Jan 2015 10:59:41 +0100
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	"Ahmed S. Darwish" <darwish.07@...il.com>,
	Olivier Sobrie <olivier@...rie.be>,
	Oliver Hartkopp <socketcan@...tkopp.net>,
	Wolfgang Grandegger <wg@...ndegger.com>
CC:	"David S. Miller" <davem@...emloft.net>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Linux-CAN <linux-can@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/4] can: kvaser_usb: Don't free packets when tight
 on URBs

On 01/05/2015 06:49 PM, 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>
> Acked-by: Olivier Sobrie <olivier@...rie.be>

Applied 1-3 to can/master + added stable on Cc.

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
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