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| author | Li RongQing <roy.qing.li@gmail.com> | 2014-06-18 13:46:02 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-07-28 08:08:23 -0700 |
| commit | f8e4d67de57bed98a22f2f55d45224497c6a0338 (patch) | |
| tree | c2675cf4e0b214178d2db424e074fe24cbc76da5 | |
| parent | 97abf5302d11906cf042c5d2c5f87d44084e7fb2 (diff) | |
| download | lwn-f8e4d67de57bed98a22f2f55d45224497c6a0338.tar.gz lwn-f8e4d67de57bed98a22f2f55d45224497c6a0338.zip | |
8021q: fix a potential memory leak
[ 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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/8021q/vlan_core.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c index 3c32bd257b73..80e0d0360b80 100644 --- a/net/8021q/vlan_core.c +++ b/net/8021q/vlan_core.c @@ -114,8 +114,11 @@ EXPORT_SYMBOL(vlan_dev_vlan_proto); 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; |