This is a note to let you know that I've just added the patch titled
openvswitch: fix panic with multiple vlan headers
to the 3.10-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:
openvswitch-fix-panic-with-multiple-vlan-headers.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Sun Oct 12 16:27:58 CEST 2014
From: Jiri Benc <jbenc@xxxxxxxxxx>
Date: Thu, 21 Aug 2014 21:33:44 +0200
Subject: openvswitch: fix panic with multiple vlan headers
From: Jiri Benc <jbenc@xxxxxxxxxx>
[ Upstream commit 2ba5af42a7b59ef01f9081234d8855140738defd ]
When there are multiple vlan headers present in a received frame, the first
one is put into vlan_tci and protocol is set to ETH_P_8021Q. Anything in the
skb beyond the VLAN TPID may be still non-linear, including the inner TCI
and ethertype. While ovs_flow_extract takes care of IP and IPv6 headers, it
does nothing with ETH_P_8021Q. Later, if OVS_ACTION_ATTR_POP_VLAN is
executed, __pop_vlan_tci pulls the next vlan header into vlan_tci.
This leads to two things:
1. Part of the resulting ethernet header is in the non-linear part of the
skb. When eth_type_trans is called later as the result of
OVS_ACTION_ATTR_OUTPUT, kernel BUGs in __skb_pull. Also, __pop_vlan_tci
is in fact accessing random data when it reads past the TPID.
2. network_header points into the ethernet header instead of behind it.
mac_len is set to a wrong value (10), too.
Reported-by: Yulong Pei <ypei@xxxxxxxxxx>
Signed-off-by: Jiri Benc <jbenc@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/openvswitch/actions.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -40,6 +40,9 @@ static int do_execute_actions(struct dat
static int make_writable(struct sk_buff *skb, int write_len)
{
+ if (!pskb_may_pull(skb, write_len))
+ return -ENOMEM;
+
if (!skb_cloned(skb) || skb_clone_writable(skb, write_len))
return 0;
@@ -68,6 +71,8 @@ static int __pop_vlan_tci(struct sk_buff
vlan_set_encap_proto(skb, vhdr);
skb->mac_header += VLAN_HLEN;
+ if (skb_network_offset(skb) < ETH_HLEN)
+ skb_set_network_header(skb, ETH_HLEN);
skb_reset_mac_len(skb);
return 0;
Patches currently in stable-queue which might be from jbenc@xxxxxxxxxx are
queue-3.10/openvswitch-fix-panic-with-multiple-vlan-headers.patch
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