netfilter: ctnetlink: fix rcu context imbalance

Introduced by 7ec47496 (netfilter: ctnetlink: cleanup master conntrack assignation):

net/netfilter/nf_conntrack_netlink.c:1275:2: warning: context imbalance in 'ctnetlink_create_conntrack' - different lock contexts for basic block

Signed-off-by: Patrick McHardy <kaber@trash.net>

diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 735ea9c..d1fe9d1 100644 (file)
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -1146,7 +1146,7 @@ ctnetlink_create_conntrack(struct nlattr *cda[],
                return ERR_PTR(-ENOMEM);
 
        if (!cda[CTA_TIMEOUT])
-               goto err;
+               goto err1;
        ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
 
        ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
@@ -1157,10 +1157,8 @@ ctnetlink_create_conntrack(struct nlattr *cda[],
                char *helpname;
  
                err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
-               if (err < 0) {
-                       rcu_read_unlock();
-                       goto err;
-               }
+               if (err < 0)
+                       goto err2;
 
                helper = __nf_conntrack_helper_find_byname(helpname);
                if (helper == NULL) {
@@ -1168,28 +1166,26 @@ ctnetlink_create_conntrack(struct nlattr *cda[],
 #ifdef CONFIG_MODULES
                        if (request_module("nfct-helper-%s", helpname) < 0) {
                                err = -EOPNOTSUPP;
-                               goto err;
+                               goto err1;
                        }
 
                        rcu_read_lock();
                        helper = __nf_conntrack_helper_find_byname(helpname);
                        if (helper) {
-                               rcu_read_unlock();
                                err = -EAGAIN;
-                               goto err;
+                               goto err2;
                        }
                        rcu_read_unlock();
 #endif
                        err = -EOPNOTSUPP;
-                       goto err;
+                       goto err1;
                } else {
                        struct nf_conn_help *help;
 
                        help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
                        if (help == NULL) {
-                               rcu_read_unlock();
                                err = -ENOMEM;
-                               goto err;
+                               goto err2;
                        }
 
                        /* not in hash table yet so not strictly necessary */
@@ -1198,44 +1194,34 @@ ctnetlink_create_conntrack(struct nlattr *cda[],
        } else {
                /* try an implicit helper assignation */
                err = __nf_ct_try_assign_helper(ct, GFP_ATOMIC);
-               if (err < 0) {
-                       rcu_read_unlock();
-                       goto err;
-               }
+               if (err < 0)
+                       goto err2;
        }
 
        if (cda[CTA_STATUS]) {
                err = ctnetlink_change_status(ct, cda);
-               if (err < 0) {
-                       rcu_read_unlock();
-                       goto err;
-               }
+               if (err < 0)
+                       goto err2;
        }
 
        if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
                err = ctnetlink_change_nat(ct, cda);
-               if (err < 0) {
-                       rcu_read_unlock();
-                       goto err;
-               }
+               if (err < 0)
+                       goto err2;
        }
 
 #ifdef CONFIG_NF_NAT_NEEDED
        if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
                err = ctnetlink_change_nat_seq_adj(ct, cda);
-               if (err < 0) {
-                       rcu_read_unlock();
-                       goto err;
-               }
+               if (err < 0)
+                       goto err2;
        }
 #endif
 
        if (cda[CTA_PROTOINFO]) {
                err = ctnetlink_change_protoinfo(ct, cda);
-               if (err < 0) {
-                       rcu_read_unlock();
-                       goto err;
-               }
+               if (err < 0)
+                       goto err2;
        }
 
        nf_ct_acct_ext_add(ct, GFP_ATOMIC);
@@ -1253,12 +1239,12 @@ ctnetlink_create_conntrack(struct nlattr *cda[],
 
                err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
                if (err < 0)
-                       goto err;
+                       goto err2;
 
                master_h = __nf_conntrack_find(&init_net, &master);
                if (master_h == NULL) {
                        err = -ENOENT;
-                       goto err;
+                       goto err2;
                }
                master_ct = nf_ct_tuplehash_to_ctrack(master_h);
                nf_conntrack_get(&master_ct->ct_general);
@@ -1271,7 +1257,10 @@ ctnetlink_create_conntrack(struct nlattr *cda[],
        rcu_read_unlock();
 
        return ct;
-err:
+
+err2:
+       rcu_read_unlock();
+err1:
        nf_conntrack_free(ct);
        return ERR_PTR(err);
 }