netdev - [PATCH] inet: Avoid unitialized variable warning in inet

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Date:   Thu,  1 Feb 2018 11:26:23 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     "David S . Miller" <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Cc:     Arnd Bergmann <arnd@...db.de>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: [PATCH] inet: Avoid unitialized variable warning in inet_unhash()

With gcc-4.1.2:

    net/ipv4/inet_hashtables.c: In function ‘inet_unhash’:
    net/ipv4/inet_hashtables.c:628: warning: ‘ilb’ may be used uninitialized in this function

While this is a false positive, it can easily be avoided by using the
pointer itself as the canary variable.

Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
---
 net/ipv4/inet_hashtables.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 37b7da0b975dc297..31ff46daae974645 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -625,9 +625,8 @@ EXPORT_SYMBOL_GPL(inet_hash);
 void inet_unhash(struct sock *sk)
 {
 	struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
-	struct inet_listen_hashbucket *ilb;
+	struct inet_listen_hashbucket *ilb = NULL;
 	spinlock_t *lock;
-	bool listener = false;
 
 	if (sk_unhashed(sk))
 		return;
@@ -635,7 +634,6 @@ void inet_unhash(struct sock *sk)
 	if (sk->sk_state == TCP_LISTEN) {
 		ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)];
 		lock = &ilb->lock;
-		listener = true;
 	} else {
 		lock = inet_ehash_lockp(hashinfo, sk->sk_hash);
 	}
@@ -645,7 +643,7 @@ void inet_unhash(struct sock *sk)
 
 	if (rcu_access_pointer(sk->sk_reuseport_cb))
 		reuseport_detach_sock(sk);
-	if (listener) {
+	if (ilb) {
 		inet_unhash2(hashinfo, sk);
 		 __sk_del_node_init(sk);
 		 ilb->count--;
-- 
2.7.4