This is a note to let you know that I've just added the patch titled
ip_tunnel: Fix a memory corruption in ip_tunnel_xmit
to the 3.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ip_tunnel-fix-a-memory-corruption-in-ip_tunnel_xmit.patch
and it can be found in the queue-3.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 50b1517c2ea48d734bf75045c21dc8340ecf438b Mon Sep 17 00:00:00 2001
From: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Date: Tue, 1 Oct 2013 11:33:59 +0200
Subject: ip_tunnel: Fix a memory corruption in ip_tunnel_xmit
From: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
[ 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@xxxxxxxxxx>
Signed-off-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ipv4/ip_tunnel.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -645,13 +645,13 @@ void ip_tunnel_xmit(struct sk_buff *skb,
max_headroom = LL_RESERVED_SPACE(rt->dst.dev) + 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;
}
err = iptunnel_xmit(dev_net(dev), rt, skb,
Patches currently in stable-queue which might be from steffen.klassert@xxxxxxxxxxx are
queue-3.11/ip_tunnel-fix-a-memory-corruption-in-ip_tunnel_xmit.patch
queue-3.11/net-sctp-fix-ipv6-ipsec-encryption-bug-in-sctp_v6_xmit.patch
queue-3.11/ip_tunnel_core-change-__skb_push-back-to-skb_push.patch
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