linux-kernel - [PATCH 3.4 06/23] 8021q: fix a potential memory leak

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Message-Id: <20140726190149.916041369@linuxfoundation.org>
Date:	Sat, 26 Jul 2014 12:02:06 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Li RongQing <roy.qing.li@...il.com>,
	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.4 06/23] 8021q: fix a potential memory leak

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Li RongQing <roy.qing.li@...il.com>

[ Upstream commit 916c1689a09bc1ca81f2d7a34876f8d35aadd11b ]

skb_cow called in vlan_reorder_header does not free the skb when it failed,
and vlan_reorder_header returns NULL to reset original skb when it is called
in vlan_untag, lead to a memory leak.

Signed-off-by: Li RongQing <roy.qing.li@...il.com>
Acked-by: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/8021q/vlan_core.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/net/8021q/vlan_core.c
+++ b/net/8021q/vlan_core.c
@@ -96,8 +96,11 @@ EXPORT_SYMBOL(vlan_dev_vlan_id);
 
 static struct sk_buff *vlan_reorder_header(struct sk_buff *skb)
 {
-	if (skb_cow(skb, skb_headroom(skb)) < 0)
+	if (skb_cow(skb, skb_headroom(skb)) < 0) {
+		kfree_skb(skb);
 		return NULL;
+	}
+
 	memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN);
 	skb->mac_header += VLAN_HLEN;
 	return skb;


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