datapath: Fix race.

[sliver-openvswitch.git] / datapath / datapath.c

diff --git a/datapath/datapath.c b/datapath/datapath.c
index c756e2f..edbbb88 100644 (file)
--- a/datapath/datapath.c
+++ b/datapath/datapath.c
@@ -400,7 +400,7 @@ static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
 #endif
                .snd_portid = upcall_info->portid,
        };
-       size_t len, plen;
+       size_t len;
        unsigned int hlen;
        int err, dp_ifindex;
 
@@ -472,9 +472,12 @@ static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
        skb_zerocopy(user_skb, skb, skb->len, hlen);
 
        /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
-       if (!(dp->user_features & OVS_DP_F_UNALIGNED) &&
-           (plen = (ALIGN(user_skb->len, NLA_ALIGNTO) - user_skb->len)) > 0)
-               memset(skb_put(user_skb, plen), 0, plen);
+       if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
+               size_t plen = NLA_ALIGN(user_skb->len) - user_skb->len;
+
+               if (plen > 0)
+                       memset(skb_put(user_skb, plen), 0, plen);
+       }
 
        ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
 
@@ -862,11 +865,8 @@ static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
                        goto err_unlock_ovs;
 
                /* The unmasked key has to be the same for flow updates. */
-               error = -EINVAL;
-               if (!ovs_flow_cmp_unmasked_key(flow, &match)) {
-                       OVS_NLERR("Flow modification message rejected, unmasked key does not match.\n");
+               if (!ovs_flow_cmp_unmasked_key(flow, &match))
                        goto err_unlock_ovs;
-               }
 
                /* Update actions. */
                old_acts = ovsl_dereference(flow->sf_acts);
@@ -1089,6 +1089,7 @@ static size_t ovs_dp_cmd_msg_size(void)
        msgsize += nla_total_size(IFNAMSIZ);
        msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
        msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
+       msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
 
        return msgsize;
 }
@@ -1766,11 +1767,12 @@ 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;