netdev - [PATCH 1/15] spidernet: null out skb pointer after its been used.

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Message-ID: <20070611181702.GA13741@austin.ibm.com>
Date:	Mon, 11 Jun 2007 13:17:02 -0500
From:	linas@...tin.ibm.com (Linas Vepstas)
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Michael Ellerman <michael@...erman.id.au>, netdev@...r.kernel.org,
	cbe-oss-dev@...abs.org
Subject: [PATCH 1/15] spidernet: null out skb pointer after its been used.


Avoid kernel crash in mm/slab.c due to double-free of pointer.

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: linux-2.6.22-rc1/drivers/net/spider_net.c
===================================================================
--- linux-2.6.22-rc1.orig/drivers/net/spider_net.c	2007-06-08 15:45:33.000000000 -0500
+++ linux-2.6.22-rc1/drivers/net/spider_net.c	2007-06-08 15:48:10.000000000 -0500
@@ -1131,6 +1131,7 @@ 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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