netdev - [PATCH] hdlc: fix null-deref on allocation failure

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Message-ID: <20151117142606.4a0ca2d1@samsung9>
Date:	Tue, 17 Nov 2015 14:26:06 -0800
From:	Stephen Hemminger <shemming@...cade.com>
To:	Krzysztof Halasa <khc@...waw.pl>
CC:	<netdev@...r.kernel.org>
Subject: [PATCH] hdlc: fix null-deref on allocation failure

If alloc_netdev() failed and return NULL, then the next instruction
would dereference it. Found by Coverity.

Compile tested only. Not sure if anyone still uses this driver
(or the whole WAN subsystem).

Signed-off-by: Stephen Hemminger <stephen@...workplumber.org>

--- a/drivers/net/wan/hdlc_fr.c	2015-08-18 17:45:21.414525304 -0700
+++ b/drivers/net/wan/hdlc_fr.c	2015-11-16 09:50:07.317597825 -0800
@@ -1075,11 +1075,10 @@ static int fr_add_pvc(struct net_device
 
 	used = pvc_is_used(pvc);
 
-	if (type == ARPHRD_ETHER) {
+	if (type == ARPHRD_ETHER)
 		dev = alloc_netdev(0, "pvceth%d", NET_NAME_UNKNOWN,
 				   ether_setup);
-		dev->priv_flags &= ~IFF_TX_SKB_SHARING;
-	} else
+	else
 		dev = alloc_netdev(0, "pvc%d", NET_NAME_UNKNOWN, pvc_setup);
 
 	if (!dev) {
@@ -1088,9 +1087,10 @@ static int fr_add_pvc(struct net_device
 		return -ENOBUFS;
 	}
 
-	if (type == ARPHRD_ETHER)
+	if (type == ARPHRD_ETHER) {
+		dev->priv_flags &= ~IFF_TX_SKB_SHARING;
 		eth_hw_addr_random(dev);
-	else {
+	} else {
 		*(__be16*)dev->dev_addr = htons(dlci);
 		dlci_to_q922(dev->broadcast, dlci);
 	}
--
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