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authorJarno Rajahalme <jrajahalme@nicira.com>2014-02-16 02:42:29 +0100
committerJesse Gross <jesse@nicira.com>2014-02-16 02:42:29 +0100
commit42ee19e2939277a5277c307e517ce2d7ba5f0703 (patch)
tree57448c732f703451d3e7a96ff9e736ea62acd1dc /net/openvswitch
parentopenvswitch: Read tcp flags only then the tranport header is present. (diff)
downloadlinux-42ee19e2939277a5277c307e517ce2d7ba5f0703.tar.xz
linux-42ee19e2939277a5277c307e517ce2d7ba5f0703.zip
openvswitch: Fix race.
ovs_vport_cmd_dump() did rcu_read_lock() only after getting the datapath, which could have been deleted in between. Resolved by taking rcu_read_lock() before the get_dp() call. Signed-off-by: Jarno Rajahalme <jrajahalme@nicira.com> Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Diffstat (limited to 'net/openvswitch')
-rw-r--r--net/openvswitch/datapath.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index e42340d3f820..8601b320b443 100644
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -1762,11 +1762,12 @@ static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
int bucket = cb->args[0], skip = cb->args[1];
int i, j = 0;
+ rcu_read_lock();
dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
- if (!dp)
+ if (!dp) {
+ rcu_read_unlock();
return -ENODEV;
-
- rcu_read_lock();
+ }
for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
struct vport *vport;