linux-kernel - [08/17] atl1: fix resume

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Message-Id: <20101022184033.209913125@clark.site>
Date:	Fri, 22 Oct 2010 11:39:33 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Luca Tettamanti <kronos.it@...il.com>,
	Chris Snook <chris.snook@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [08/17] atl1: fix resume

2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Luca Tettamanti <kronos.it@...il.com>

commit ec5a32f67c603b11d68eb283d94eb89a4f6cfce1 upstream.

adapter->cmb.cmb is initialized when the device is opened and freed when
it's closed. Accessing it unconditionally during resume results either
in a crash (NULL pointer dereference, when the interface has not been
opened yet) or data corruption (when the interface has been used and
brought down adapter->cmb.cmb points to a deallocated memory area).

Signed-off-by: Luca Tettamanti <kronos.it@...il.com>
Acked-by: Chris Snook <chris.snook@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/net/atlx/atl1.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/net/atlx/atl1.c
+++ b/drivers/net/atlx/atl1.c
@@ -2881,10 +2881,11 @@ static int atl1_resume(struct pci_dev *p
 	pci_enable_wake(pdev, PCI_D3cold, 0);

 	atl1_reset_hw(&adapter->hw);
-	adapter->cmb.cmb->int_stats = 0;

-	if (netif_running(netdev))
+	if (netif_running(netdev)) {
+		adapter->cmb.cmb->int_stats = 0;
 		atl1_up(adapter);
+	}
 	netif_device_attach(netdev);

 	return 0;

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