netdev - Re: Null dereference in uli526x_rx

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Date:	Fri, 27 Mar 2009 22:47:54 -0400
From:	Kyle McMartin <kyle@...artin.ca>
To:	Dan Carpenter <error27@...il.com>
Cc:	grundler@...isc-linux.org, kyle@...artin.ca, netdev@...r.kernel.org
Subject: Re: Null dereference in uli526x_rx_packet()

On Fri, Mar 27, 2009 at 01:31:36PM +0300, Dan Carpenter wrote:
> Smatch (http://repo.or.cz/w/smatch.git/) complains about the error 
> handling in uli526x_rx_packet().
> 
> I don't know if the right fix is to return like this patch does or to set 
> skb = rxptr->rx_skb_ptr again.
> 

Ick... that's a good catch. I'll have to think about this.

regards, Kyle

> --- orig/drivers/net/tulip/uli526x.c	2009-03-27 07:52:32.000000000 +0300
> +++ devel/drivers/net/tulip/uli526x.c	2009-03-27 07:57:05.000000000 +0300
> @@ -844,10 +844,13 @@
>  
>  				/* Good packet, send to upper layer */
>  				/* Shorst packet used new SKB */
> -				if ( (rxlen < RX_COPY_SIZE) &&
> -					( (skb = dev_alloc_skb(rxlen + 2) )
> -					!= NULL) ) {
> -					/* size less than COPY_SIZE, allocate a rxlen SKB */
> +				/* size less than COPY_SIZE, allocate a rxlen SKB */
> +				if (rxlen < RX_COPY_SIZE) {
> +					skb = dev_alloc_skb(rxlen + 2);
> +					if (!skb)
> +						return;
> +				}
> +				if (rxlen < RX_COPY_SIZE) {
>  					skb_reserve(skb, 2); /* 16byte align */
>  					memcpy(skb_put(skb, rxlen),
>  					       skb_tail_pointer(rxptr->rx_skb_ptr),
> 
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