netdev - Re: use after free bug in socket code

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Message-ID: <4A5CC626.8020800@grandegger.com>
Date:	Tue, 14 Jul 2009 19:53:42 +0200
From:	Wolfgang Grandegger <wg@...ndegger.com>
To:	Lothar Waßmann <LW@...O-electronics.de>
CC:	Oliver Hartkopp <oliver@...tkopp.net>,
	Herbert Xu <herbert@...dor.apana.org.au>, davem@...emloft.net,
	netdev@...r.kernel.org, urs.thuermann@...kswagen.de,
	Urs Thuermann <urs@...ogud.escape.de>
Subject: Re: use after free bug in socket code

Lothar Waßmann wrote:
> Hi,
> 
> Oliver Hartkopp writes:
>>> The situation where this triggers a bug is when the chip driver's
>>> hard_start_xmit function returns a NETDEV_TX_BUSY and subsequently the
>>> can interface is deconfigured.
>>>
>>> Maybe you could try this on different hardware?
>> Will do when i'm back at work ;-)
>>
> Should I wait for the results of your tests before submitting the
> patches?

A user has reported sporadic kernel panics with a down/up/restart stress
test a while ago on the Socket-CAN mailing list and the patch seems to
solve his problem:

https://lists.berlios.de/pipermail/socketcan-users/2009-July/000985.html

>From my point of view you can go ahead.

Thanks.

Wolfgang.
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