linux-kernel - Re: [patch] Fix bug #13853: dereference pointer 'dev' before null check

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 3 Mar 2011 11:23:47 -0800
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Jinqiu <crindy646@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [patch] Fix bug #13853: dereference pointer 'dev' before null
 check

On Wed, 02 Mar 2011 21:20:21 -0500 Jinqiu wrote:

> This patch fixes bug #13853 .This still exists in latest version.
> 'dev' is dereferenced before testing for NULL.
> 
> Signed-off-by: Jinqiu Yang<crindy646@...il.com>
> --- a/drivers/net/ariadne.c
> +++ b/drivers/net/ariadne.c
> @@ -420,7 +420,7 @@ static inline void ariadne_reset(struct
> static irqreturn_t ariadne_interrupt(int irq, void *data)
> {

It looks like thunderbird has split a long line into multiple lines for you.
This is bad.  See if Documentation/email-clients.txt can help you out any.


> 	struct net_device *dev = (struct net_device *) data;
> - 	volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
> + 	volatile struct Am79C960 *lance;
> 	struct ariadne_private *priv;
> 	int csr0, boguscnt;
> 	int handled = 0;
> @@ -429,6 +429, 7 @@ static irqreturn_t ariadne_interrupt(int
> 		printk(KERN_WARNING  "ariadne_interrupt(): irq for unknown device.\n");
> 		return IRQ_NONE;
> 	}
> + 	lance = (struct Am79C960 *)dev->base_addr;
> 
> 	lance->RAP = CSR0; 					/* PCnet-ISA Controller Status */
> 
> 
> 
> 
> --


---
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/