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netfilter: nfnetlink_queue: avoid harmless unnitialized variable warnings 

Several ARM default configurations give us warnings on recent
compilers about potentially uninitialized variables in the
nfnetlink code in two functions:

net/netfilter/nfnetlink_queue.c: In function 'nfqnl_build_packet_message':
net/netfilter/nfnetlink_queue.c:519:19: warning: 'nfnl_ct' may be used uninitialized in this function [-Wmaybe-uninitialized]
  if (ct && nfnl_ct->build(skb, ct, ctinfo, NFQA_CT, NFQA_CT_INFO) < 0)

Moving the rcu_dereference(nfnl_ct_hook) call outside of the
conditional code avoids the warning without forcing us to
preinitialize the variable.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: a4b4766c3c ("netfilter: nfnetlink_queue: rename related to nfqueue attaching conntrack info")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
hifive-unleashed-5.1
Arnd Bergmann 2015-11-19 13:49:59 +01:00 committed by Pablo Neira Ayuso
parent 4c6980462f
commit 8e662164ab
1 changed files with 5 additions and 3 deletions
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8
net/netfilter/nfnetlink_queue.c
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@ -365,8 +365,9 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
break;
}
nfnl_ct = rcu_dereference(nfnl_ct_hook);
if (queue->flags & NFQA_CFG_F_CONNTRACK) {
nfnl_ct = rcu_dereference(nfnl_ct_hook);
if (nfnl_ct != NULL) {
ct = nfnl_ct->get_ct(entskb, &ctinfo);
if (ct != NULL)
@ -1064,9 +1065,10 @@ nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb,
if (entry == NULL)
return -ENOENT;
/* rcu lock already held from nfnl->call_rcu. */
nfnl_ct = rcu_dereference(nfnl_ct_hook);
if (nfqa[NFQA_CT]) {
/* rcu lock already held from nfnl->call_rcu. */
nfnl_ct = rcu_dereference(nfnl_ct_hook);
if (nfnl_ct != NULL)
ct = nfqnl_ct_parse(nfnl_ct, nlh, nfqa, entry, &ctinfo);
}