linux-kernel - [PATCH] Fix a potential NULL pointer dereference in uli526x_interrupt() in drivers/net/tulip/uli526x.c

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Date:	Tue, 04 Sep 2007 16:06:50 +0800
From:	Micah Gruber <micah.gruber@...il.com>
To:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	jgarzik@...ox.com
Subject: [PATCH] Fix a potential NULL pointer dereference in uli526x_interrupt()
 in drivers/net/tulip/uli526x.c

This patch fixes a potential null dereference bug where we dereference dev before a null check. This patch simply moves the dereferencing after the null check.

Signed-off-by: Micah Gruber <micah.gruber@...il.com>
---

--- a/drivers/net/tulip/uli526x.c
+++ b/drivers/net/tulip/uli526x.c
@@ -663,7 +663,7 @@
 {
 	struct net_device *dev = dev_id;
 	struct uli526x_board_info *db = netdev_priv(dev);
-	unsigned long ioaddr;
+	unsigned long ioaddr = dev->base_addr;
 	unsigned long flags;
 
 	if (!dev) {
@@ -671,8 +671,6 @@
 		return IRQ_NONE;
 	}
 
-	ioaddr = dev->base_addr;
-
 	spin_lock_irqsave(&db->lock, flags);
 	outl(0, ioaddr + DCR7);

-
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