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

From: [email-masked] (Linas Vepstas)
Date: Tue, 22 May 2007 18:39:01 -0500

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 <[email-masked]>

----
 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;