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| author |   Wei Zhang <asuka.com@163.com> | 2014-06-28 12:34:53 -0700 |
|---|---|---|
| committer |   Pravin B Shelar <pshelar@nicira.com> | 2014-06-29 14:10:48 -0700 |
| commit | e0bb8c44ed5cfcc56b571758ed966ee48779024c (patch) | |
| tree | be67488d53526607888b26803f2445029c3e8470 /net/openvswitch/vport-gre.c | |
| parent | openvswitch: Fix a double free bug for the sample action (diff) | |
| download | linux-dev-e0bb8c44ed5cfcc56b571758ed966ee48779024c.tar.xz linux-dev-e0bb8c44ed5cfcc56b571758ed966ee48779024c.zip | |
openvswitch: supply a dummy err_handler of gre_cisco_protocol to prevent kernel crash
When use gre vport, openvswitch register a gre_cisco_protocol but
does not supply a err_handler with it. The gre_cisco_err() in
net/ipv4/gre_demux.c expect err_handler be provided with the
gre_cisco_protocol implementation, and call ->err_handler() without
existence check, cause the kernel crash.
This patch provide a err_handler to fix this bug.
This bug introduced by commit aa310701e787087d (openvswitch: Add gre
tunnel support.)
Signed-off-by: Wei Zhang <asuka.com@163.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Diffstat (limited to 'net/openvswitch/vport-gre.c')
| -rw-r--r-- | net/openvswitch/vport-gre.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/net/openvswitch/vport-gre.c b/net/openvswitch/vport-gre.c index 35ec4fed09e2..f49148a07da2 100644 --- a/net/openvswitch/vport-gre.c +++ b/net/openvswitch/vport-gre.c @@ -110,6 +110,22 @@ static int gre_rcv(struct sk_buff *skb, return PACKET_RCVD; } +/* Called with rcu_read_lock and BH disabled. */ +static int gre_err(struct sk_buff *skb, u32 info, + const struct tnl_ptk_info *tpi) +{ + struct ovs_net *ovs_net; + struct vport *vport; + + ovs_net = net_generic(dev_net(skb->dev), ovs_net_id); + vport = rcu_dereference(ovs_net->vport_net.gre_vport); + + if (unlikely(!vport)) + return PACKET_REJECT; + else + return PACKET_RCVD; +} + static int gre_tnl_send(struct vport *vport, struct sk_buff *skb) { struct net *net = ovs_dp_get_net(vport->dp); @@ -186,6 +202,7 @@ error: static struct gre_cisco_protocol gre_protocol = { .handler = gre_rcv, + .err_handler = gre_err, .priority = 1, }; |