linux-kernel - nfnetlink warnings

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Date:	Mon, 23 Nov 2015 10:36:07 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Pablo Neira Ayuso <pablo@...filter.org>
Cc:	netfilter-devel@...r.kernel.org,
	lkml <linux-kernel@...r.kernel.org>
Subject: nfnetlink warnings

Hey,

so I keep getting those since recently:

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)
                   ^
net/netfilter/nfnetlink_queue.c:316:23: note: ‘nfnl_ct’ was declared here
  struct nfnl_ct_hook *nfnl_ct;
                       ^
net/netfilter/nfnetlink_queue.c: In function ‘nfqnl_recv_verdict’:
net/netfilter/nfnetlink_queue.c:1083:11: warning: ‘nfnl_ct’ may be used uninitialized in this function [-Wmaybe-uninitialized]
    nfnl_ct->seq_adjust(entry->skb, ct, ctinfo, diff);
           ^

and was thinking can we shut them up like this? I know, it is ugly :-\

I mean, it is obvious in both cases that nfnl_ct won't be used if ct is
not set but apparently gcc can't see that far...

---
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index 7d81d280cb4f..cd61b0b5c413 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -372,6 +372,8 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
 			if (ct != NULL)
 				size += nfnl_ct->build_size(ct);
 		}
+	} else {
+		nfnl_ct = NULL;
 	}
 
 	if (queue->flags & NFQA_CFG_F_UID_GID) {
@@ -1069,6 +1071,8 @@ nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb,
 		nfnl_ct = rcu_dereference(nfnl_ct_hook);
 		if (nfnl_ct != NULL)
 			ct = nfqnl_ct_parse(nfnl_ct, nlh, nfqa, entry, &ctinfo);
+	} else {
+		nfnl_ct = NULL;
 	}
 
 	if (nfqa[NFQA_PAYLOAD]) {

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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