netdev - [PATCH 5/10] spidernet: null out skb pointer after its been used.

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Message-ID: <20070522233901.GD2147@austin.ibm.com>
Date:	Tue, 22 May 2007 18:39:01 -0500
From:	linas@...tin.ibm.com (Linas Vepstas)
To:	Jeff Garzik <jgarzik@...ox.com>, Andrew Morton <akpm@...l.org>
Cc:	cbe-oss-dev@...abs.org, netdev@...r.kernel.org,
	linuxppc-dev@...abs.org, Florin Malita <fmalita@...il.com>
Subject: [PATCH 5/10] spidernet: null out skb pointer after its been used.


If the ethernet interface is brought down while there is still
RX traffic in flight, the device shutdown routine can end up
trying to double-free an skb, leading to a crash in mm/slab.c
Avoid the double-free by nulling out the skb pointer.

Signed-off-by: Linas Vepstas <linas@...tin.ibm.com>

----
 drivers/net/spider_net.c |    1 +
 1 file changed, 1 insertion(+)

Index: netdev-2.6/drivers/net/spider_net.c
===================================================================
--- netdev-2.6.orig/drivers/net/spider_net.c	2007-05-22 18:03:32.000000000 -0500
+++ netdev-2.6/drivers/net/spider_net.c	2007-05-22 18:03:34.000000000 -0500
@@ -1136,6 +1136,7 @@ spider_net_decode_one_descr(struct spide
 
 	/* Ok, we've got a packet in descr */
 	spider_net_pass_skb_up(descr, card);
+	descr->skb = NULL;
 	hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
 	return 1;
 
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