netdev - [PATCH Resend] af_unix: dont send SCM_CREDENTIAL when dest socket is NULL

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Message-ID: <51510FAC.5090605@huawei.com>
Date:	Tue, 26 Mar 2013 11:02:04 +0800
From:	dingtianhong <dingtianhong@...wei.com>
To:	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Li Zefan <lizefan@...wei.com>, Xinwei Hu <huxinwei@...wei.com>,
	<netdev@...r.kernel.org>
Subject: [PATCH Resend] af_unix: dont send SCM_CREDENTIAL when dest socket
 is NULL

SCM_SCREDENTIALS should apply to write() syscalls only either source or destination
socket asserted SOCK_PASSCRED. The original implememtation in maybe_add_creds is wrong,
and breaks several LSB testcases ( i.e. /tset/LSB.os/netowkr/recvfrom/T.recvfrom).

Origionally-authored-by: Karel Srot <ksrot@...hat.com>
Signed-off-by: Ding Tianhong <dingtianhong@...wei.com>
---
 net/unix/af_unix.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 51be64f..99189fd 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -1413,8 +1413,8 @@ static void maybe_add_creds(struct sk_buff *skb, const struct socket *sock,
 	if (UNIXCB(skb).cred)
 		return;
 	if (test_bit(SOCK_PASSCRED, &sock->flags) ||
-	    !other->sk_socket ||
-	    test_bit(SOCK_PASSCRED, &other->sk_socket->flags)) {
+	    (other->sk_socket &&
+	    test_bit(SOCK_PASSCRED, &other->sk_socket->flags))) {
 		UNIXCB(skb).pid  = get_pid(task_tgid(current));
 		UNIXCB(skb).cred = get_current_cred();
 	}
-- 1.8.0

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