From: linas@austin.ibm.com (Linas Vepstas)
To: Jeff Garzik <jgarzik@pobox.com>, Andrew Morton <akpm@osdl.org>
Cc: netdev@vger.kernel.org, Florin Malita <fmalita@gmail.com>,
cbe-oss-dev@ozlabs.org, linuxppc-dev@ozlabs.org
Subject: [PATCH 5/10] spidernet: null out skb pointer after its been used.
Date: Tue, 22 May 2007 18:39:01 -0500 [thread overview]
Message-ID: <20070522233901.GD2147@austin.ibm.com> (raw)
In-Reply-To: <20070522230942.GT5921@austin.ibm.com>
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@austin.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;
next prev parent reply other threads:[~2007-05-22 23:39 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-22 23:09 [PATCH 1/10] spidernet: skb used after netif_receive_skb Linas Vepstas
2007-05-22 23:13 ` [PATCH 2/10] spidernet: beautify error messages Linas Vepstas
2007-05-24 21:27 ` Jeff Garzik
2007-05-22 23:21 ` [PATCH 3/10] spidernet: move a block of code around Linas Vepstas
2007-05-22 23:36 ` [PATCH 4/10] spidernet: zero out a pointer Linas Vepstas
2007-05-22 23:39 ` Linas Vepstas [this message]
2007-05-22 23:40 ` [PATCH 6/10] spidernet: Don't terminate the RX ring Linas Vepstas
2007-05-22 23:42 ` [PATCH 7/10] spidernet: enhance the dump routine Linas Vepstas
2007-05-22 23:45 ` [PATCH 8/10] spidernet: reset the card when an rxramfull is seen Linas Vepstas
2007-05-22 23:47 ` [PATCH 9/10] spidernet: service TX later Linas Vepstas
2007-05-22 23:52 ` [PATCH 10/10] spidernet: increase the NAPI weight Linas Vepstas
2007-05-24 21:25 ` [PATCH 1/10] spidernet: skb used after netif_receive_skb Jeff Garzik
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