Re: [Patch] ariadne: fix possible null dereference

[Randy Dunlap]

On Sun, 6 Mar 2011 02:08:32 -0500 j223yang@xxxxxxxxxxxxxxxxxx wrote:

> Hi Randy,
> I have tested my patch, and it is ok now.
> Could you please try patching again? Sorry for previous trouble.
> Thank you!

Acked-by: Randy Dunlap <rdunlap@xxxxxxxxxxxx>

Thanks.

> Jinqiu
> ------------------------------------------------------
> This patch fixes bugzilla #13853:
> https://bugzilla.kernel.org/show_bug.cgi?id=13853
> 
> The patch removes dereference of 'dev' after testing for NULL.
> 
> Signed-off-by: Jinqiu Yang<crindy646@xxxxxxxxx>
> ---
>  ariadne.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ariadne.c b/drivers/net/ariadne.c
> --- a/drivers/net/ariadne.c	2011-03-04 11:16:42.332164362 -0500
> +++ b/drivers/net/ariadne.c	2011-03-05 21:11:52.949164759 -0500
> @@ -420,7 +420,7 @@ static inline void ariadne_reset(struct 
>  static irqreturn_t ariadne_interrupt(int irq, void *data)
>  {
>      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;
> @@ -430,6 +430,7 @@ static irqreturn_t ariadne_interrupt(int
>  	return IRQ_NONE;
>      }
>  
> +    lance = (struct Am79C960 *)dev->base_addr;
>      lance->RAP = CSR0;			/* PCnet-ISA Controller Status */
>  
>      if (!(lance->RDP & INTR))		/* Check if any interrupt has been */


---
~Randy
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