netdev - Re: [PATCH] smsc95xx: fix suspend buffer overflow

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Date:	Tue, 27 Nov 2012 09:42:58 -0800
From:	Joe Perches <joe@...ches.com>
To:	Steve Glendinning <steve.glendinning@...well.net>
Cc:	netdev@...r.kernel.org, dan.carpenter@...cle.com
Subject: Re: [PATCH] smsc95xx: fix suspend buffer overflow

On Tue, 2012-11-27 at 13:23 +0000, Steve Glendinning wrote:
> This patch fixes a buffer overflow introduced by bbd9f9e, where
> the filter_mask array is accessed beyond its bounds.
> 
> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
> Signed-off-by: Steve Glendinning <steve.glendinning@...well.net>
> ---
>  drivers/net/usb/smsc95xx.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c
> index 79d495d..6cdc504 100644
> --- a/drivers/net/usb/smsc95xx.c
> +++ b/drivers/net/usb/smsc95xx.c
> @@ -1281,7 +1281,7 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
>  	}
>  
>  	if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
> -		u32 *filter_mask = kzalloc(32, GFP_KERNEL);
> +		u32 *filter_mask = kzalloc(sizeof(u32) * 32, GFP_KERNEL);

It's also unchecked for alloc failure.

>  		u32 command[2];
>  		u32 offset[2];
>  		u32 crc[4];



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