netdev - [PATCH] af_unix: Use kfree for addresses in unix

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Date:	Thu, 14 Jan 2016 16:22:10 +0000
From:	Rainer Weikusat <rweikusat@...ileactivedefense.com>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] af_unix: Use kfree for addresses in unix_bind

Use kfree instead of unix_release_addr when freeing newly-allocated
unix_address structures after binding the socket failed. The second
function does an atomic_dec_and_test in order to free the address once
its reference count falls to zero which isn't necessary for the
unix_bind error path as the new structure wasn't published yet. 'Using
kfree' is also how unix_autobind handles this case.

Signed-off-by: Rainer Weikusat <rweikusat@...ileactivedefense.com>
---
gdiff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index c5bf5ef..b894a3c 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -1044,7 +1044,7 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 		if (err) {
 			if (err == -EEXIST)
 				err = -EADDRINUSE;
-			unix_release_addr(addr);
+			kfree(addr);
 			goto out_up;
 		}
 		addr->hash = UNIX_HASH_SIZE;
@@ -1057,7 +1057,7 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 		err = -EADDRINUSE;
 		if (__unix_find_socket_byname(net, sunaddr, addr_len,
 					      sk->sk_type, hash)) {
-			unix_release_addr(addr);
+			kfree(addr);
 			goto out_unlock;
 		}