netdev - [patch] mac80211: potential null dereference in mesh forwarding

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Message-ID: <20110103054355.GP1886@bicker>
Date:	Mon, 3 Jan 2011 08:43:55 +0300
From:	Dan Carpenter <error27@...il.com>
To:	"John W. Linville" <linville@...driver.com>
Cc:	Johannes Berg <johannes@...solutions.net>,
	"David S. Miller" <davem@...emloft.net>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch] mac80211: potential null dereference in mesh forwarding

The printk() is supposed to be ratelimited but we should always goto out
when fwd_skb is NULL.  Otherwise it gets dereferenced on the next line.

Signed-off-by: Dan Carpenter <error27@...il.com>

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 5e9d3bc..dc8b566 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1831,8 +1831,9 @@ ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
 
 			fwd_skb = skb_copy(skb, GFP_ATOMIC);
 
-			if (!fwd_skb && net_ratelimit()) {
-				printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
+			if (!fwd_skb) {
+				if (net_ratelimit())
+					printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
 						   sdata->name);
 				goto out;
 			}
--
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