netdev - Null dereference in uli526x_rx

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Message-ID: <Pine.LNX.4.64.0903270801020.5354@usbsys.site>
Date:	Fri, 27 Mar 2009 13:31:36 +0300 (EAT)
From:	Dan Carpenter <error27@...il.com>
To:	grundler@...isc-linux.org, kyle@...artin.ca
cc:	netdev@...r.kernel.org
Subject: Null dereference in uli526x_rx_packet()

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.

regards,
dan carpenter

--- 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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