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Date: Tue, 24 Mar 2009 15:03:57 +0100 (MET)
From: Patrick McHardy <kaber@...sh.net>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, Patrick McHardy <kaber@...sh.net>,
netfilter-devel@...r.kernel.org
Subject: netfilter 38/41: ctnetlink: fix rcu context imbalance
commit 0f5b3e85a3716efebb0150ebb7c6d022e2bf17d7
Author: Patrick McHardy <kaber@...sh.net>
Date: Wed Mar 18 17:36:40 2009 +0100
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@...sh.net>
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 735ea9c..d1fe9d1 100644
--- 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);
}
--
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