From 3592fd4de5a3283a94d9e482d6960cbf3b72c790 Mon Sep 17 00:00:00 2001
From: Robert Watson <rwatson@FreeBSD.org>
Date: Wed, 28 Feb 2007 08:08:50 +0000
Subject: [PATCH] Lock unp2 after checking for a non-NULL unp2 pointer in
 uipc_send() on datagram UNIX domain sockets, not before.

---
 sys/kern/uipc_usrreq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/kern/uipc_usrreq.c b/sys/kern/uipc_usrreq.c
index 23a16b091541..3a30138e6985 100644
--- a/sys/kern/uipc_usrreq.c
+++ b/sys/kern/uipc_usrreq.c
@@ -800,11 +800,11 @@ uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
 		 * correct error that the socket is not connected.
 		 */
 		UNP_PCB_LOCK_ASSERT(unp);
-		UNP_PCB_LOCK(unp2);
 		if (unp2 == NULL) {
 			error = ENOTCONN;
 			break;
 		}
+		UNP_PCB_LOCK(unp2);
 		so2 = unp2->unp_socket;
 		if (unp->unp_addr != NULL)
 			from = (struct sockaddr *)unp->unp_addr;