linux-kernel - [PATCH 3/6] drivers/net: remove null pointer dereference

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Message-ID: <Pine.LNX.4.64.0805121537320.3694@ask.diku.dk>
Date:	Mon, 12 May 2008 15:37:58 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	jgarzik@...ox.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 3/6] drivers/net: remove null pointer dereference

From: Julia Lawall <julia@...u.dk>

If dev is NULL, it is not possible to access its name field.  So I have
simply modified the error message to drop the printing of the name field.


This problem was found using the following semantic match
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@@
expression E, E1;
identifier f;
statement S1,S2,S3;
@@

* if (E == NULL)
{
  ... when != if (E == NULL) S1 else S2
      when != E = E1
* E->f
  ... when any
  return ...;
}
else S3
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---

diff -u -p a/drivers/net/au1000_eth.c b/drivers/net/au1000_eth.c
--- a/drivers/net/au1000_eth.c	2008-04-27 11:41:11.000000000 +0200
+++ b/drivers/net/au1000_eth.c	2008-05-12 09:32:54.000000000 +0200
@@ -1242,7 +1242,7 @@ static irqreturn_t au1000_interrupt(int 
 	struct net_device *dev = (struct net_device *) dev_id;
 
 	if (dev == NULL) {
-		printk(KERN_ERR "%s: isr: null dev ptr\n", dev->name);
+		printk(KERN_ERR "isr: null dev ptr\n");
 		return IRQ_RETVAL(1);
 	}
 
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