[PATCH] inet: Avoid unitialized variable warning in inet_unhash()

[Geert Uytterhoeven]

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 <ge...@linux-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