linux-kernel - [PATCH] [2.6.22] Fix a potential NULL pointer dereference in mace_interrupt() in drivers/net/pcmcia/nmclan

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Date:	Tue, 24 Jul 2007 10:44:56 +0800
From:	Micah Gruber <micah.gruber@...il.com>
To:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	jgarzik@...ox.com
Subject: [PATCH] [2.6.22] Fix a potential NULL pointer dereference in mace_interrupt()
 in drivers/net/pcmcia/nmclan_cs.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/pcmcia/nmclan_cs.c    
+++ b/drivers/net/pcmcia/nmclan_cs.c    
@@ -996,7 +996,7 @@
 {
   struct net_device *dev = (struct net_device *) dev_id;
   mace_private *lp = netdev_priv(dev);
-  kio_addr_t ioaddr = dev->base_addr;
+  kio_addr_t ioaddr;
   int status;
   int IntrCnt = MACE_MAX_IR_ITERATIONS;

@@ -1006,6 +1006,8 @@
     return IRQ_NONE;
   }

+  ioaddr = dev->base_addr;
+
   if (lp->tx_irq_disabled) {
     printk(
       (lp->tx_irq_disabled?

-
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