linux-kernel - [PATCH] [128/139] mac80211: fix mesh forwarding

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Date:	Tue,  1 Feb 2011 16:45:27 -0800 (PST)
From:	Andi Kleen <andi@...stfloor.org>
To:	johannes.berg@...el.com, javier@...ybit.com,
	linville@...driver.com, gregkh@...e.de, ak@...ux.intel.com,
	linux-kernel@...r.kernel.org, stable@...nel.org
Subject: [PATCH] [128/139] mac80211: fix mesh forwarding

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Johannes Berg <johannes.berg@...el.com>

commit b51aff057c9d0ef6c529dc25fd9f775faf7b6c63 upstream.

Under memory pressure, the mac80211 mesh code
may helpfully print a message that it failed
to clone a mesh frame and then will proceed
to crash trying to use it anyway. Fix that.

Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Acked-by: Javier Cardona <javier@...ybit.com>
Signed-off-by: John W. Linville <linville@...driver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 net/mac80211/rx.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Index: linux-2.6.35.y/net/mac80211/rx.c
===================================================================
--- linux-2.6.35.y.orig/net/mac80211/rx.c
+++ linux-2.6.35.y/net/mac80211/rx.c
@@ -1707,9 +1707,11 @@ ieee80211_rx_h_mesh_fwding(struct ieee80
 
 			fwd_skb = skb_copy(skb, GFP_ATOMIC);
 
-			if (!fwd_skb && net_ratelimit())
+			if (!fwd_skb && net_ratelimit()) {
 				printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
 						   sdata->name);
+				goto out;
+			}
 
 			fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
 			memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
@@ -1747,6 +1749,7 @@ ieee80211_rx_h_mesh_fwding(struct ieee80
 		}
 	}
 
+ out:
 	if (is_multicast_ether_addr(hdr->addr1) ||
 	    sdata->dev->flags & IFF_PROMISC)
 		return RX_CONTINUE;
--
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