| From | Ben Hutchings <> | Date | Mon, 04 Aug 2014 17:48:32 +0100 | Subject | [PATCH 3.2 56/94] 8021q: fix a potential memory leak |
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3.2.62-rc1 review patch. If anyone has any objections, please let me know.
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From: Li RongQing <roy.qing.li@gmail.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@gmail.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- net/8021q/vlan_core.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c index e860a4f..77d3532 100644 --- 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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