diff options
| author | Steffen Klassert <steffen.klassert@secunet.com> | 2013-10-01 11:33:59 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-10-13 16:08:30 -0700 |
| commit | 23d6f8dd1cc9ca2a3aaed9c6bb24f80b39e071df (patch) | |
| tree | 9eff8a12a85b9916789890ba2368100337d562f5 /net | |
| parent | c7bd0696131d1cc596afea05d06c6fee5b7a51ca (diff) | |
ip_tunnel: Fix a memory corruption in ip_tunnel_xmit
[ Upstream commit 3e08f4a72f689c6296d336c2aab4bddd60c93ae2 ]
We might extend the used aera of a skb beyond the total
headroom when we install the ipip header. Fix this by
calling skb_cow_head() unconditionally.
Bug was introduced with commit c544193214
("GRE: Refactor GRE tunneling code.")
Cc: Pravin Shelar <pshelar@nicira.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/ip_tunnel.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c index b7a4c21c06ec..92d2f0f5d7bf 100644 --- a/net/ipv4/ip_tunnel.c +++ b/net/ipv4/ip_tunnel.c @@ -659,13 +659,13 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct iphdr) + rt->dst.header_len; - if (max_headroom > dev->needed_headroom) { + if (max_headroom > dev->needed_headroom) dev->needed_headroom = max_headroom; - if (skb_cow_head(skb, dev->needed_headroom)) { - dev->stats.tx_dropped++; - dev_kfree_skb(skb); - return; - } + + if (skb_cow_head(skb, dev->needed_headroom)) { + dev->stats.tx_dropped++; + dev_kfree_skb(skb); + return; } skb_dst_drop(skb); |