Subject: [CORRECTION][PATCH] Fix a potential NULL pointer dereference in uli526x_interrupt() in drivers/net/tulip/uli526x.c

From: Micah Gruber <[email-masked]>
Date: Tue, 04 Sep 2007 16:14:06 +0800

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 <[email-masked]>
---

--- 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 = dev->base_addr;
+	unsigned long ioaddr;
 	unsigned long flags;
 
 	if (!dev) {
@@ -671,6 +671,8 @@
 		return IRQ_NONE;
 	}
 
+	ioaddr = dev->base_addr;
+
 	spin_lock_irqsave(&db->lock, flags);
 	outl(0, ioaddr + DCR7);