linux-kernel - [PATCH 3.2 81/92] can: peak_pci: prevent use after free at netdev removal

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Date:	Sat, 07 Jun 2014 02:26:29 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Stephane Grosjean" <s.grosjean@...k-system.com>,
	"Christopher R. Baker" <cbaker@....ri.cmu.edu>,
	"Marc Kleine-Budde" <mkl@...gutronix.de>
Subject: [PATCH 3.2 81/92] can: peak_pci: prevent use after free at netdev
 removal

3.2.60-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Stephane Grosjean <s.grosjean@...k-system.com>

commit 0b5a958cf4df3a5cd578b861471e62138f55c85e upstream.

As remarked by Christopher R. Baker in his post at

http://marc.info/?l=linux-can&m=139707295706465&w=2

there's a possibility for an use after free condition at device removal.

This simplified patch introduces an additional variable to prevent the issue.
Thanks for catching this.

Reported-by: Christopher R. Baker <cbaker@....ri.cmu.edu>
Signed-off-by: Stephane Grosjean <s.grosjean@...k-system.com>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/can/sja1000/peak_pci.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

--- a/drivers/net/can/sja1000/peak_pci.c
+++ b/drivers/net/can/sja1000/peak_pci.c
@@ -98,7 +98,7 @@ static int __devinit peak_pci_probe(stru
 {
 	struct sja1000_priv *priv;
 	struct peak_pci_chan *chan;
-	struct net_device *dev;
+	struct net_device *dev, *prev_dev;
 	void __iomem *cfg_base, *reg_base;
 	u16 sub_sys_id, icr;
 	int i, err, channels;
@@ -213,11 +213,13 @@ failure_remove_channels:
 	/* Disable interrupts */
 	writew(0x0, cfg_base + PITA_ICR + 2);
 
-	for (dev = pci_get_drvdata(pdev); dev; dev = chan->prev_dev) {
-		unregister_sja1000dev(dev);
-		free_sja1000dev(dev);
+	for (dev = pci_get_drvdata(pdev); dev; dev = prev_dev) {
 		priv = netdev_priv(dev);
 		chan = priv->priv;
+		prev_dev = chan->prev_dev;
+
+		unregister_sja1000dev(dev);
+		free_sja1000dev(dev);
 	}
 
 	pci_iounmap(pdev, reg_base);
@@ -247,10 +249,12 @@ static void __devexit peak_pci_remove(st
 
 	/* Loop over all registered devices */
 	while (1) {
+		struct net_device *prev_dev = chan->prev_dev;
+
 		dev_info(&pdev->dev, "removing device %s\n", dev->name);
 		unregister_sja1000dev(dev);
 		free_sja1000dev(dev);
-		dev = chan->prev_dev;
+		dev = prev_dev;
 		if (!dev)
 			break;
 		priv = netdev_priv(dev);

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