netdev - [PATCH 5/8] af_netlink: Add needed scm_destroy after scm

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Message-ID: <m1ljajgiud.fsf@fess.ebiederm.org>
Date:	Sun, 13 Jun 2010 06:31:06 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	David Miller <davem@...emloft.net>
Cc:	Serge Hallyn <serue@...ibm.com>,
	Linux Containers <containers@...ts.osdl.org>,
	Daniel Lezcano <daniel.lezcano@...e.fr>,
	<netdev@...r.kernel.org>, Pavel Emelyanov <xemul@...allels.com>
Subject: [PATCH 5/8] af_netlink: Add needed scm_destroy after scm_send.


scm_send occasionally allocates state in the scm_cookie, so I have
modified netlink_sendmsg to guarantee that when scm_send succeeds
scm_destory will be called to free that state.

Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
 net/netlink/af_netlink.c |   11 ++++++++---
 1 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 6464a19..35654e7 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1306,19 +1306,23 @@ static int netlink_sendmsg(struct kiocb *kiocb, struct socket *sock,
 	if (msg->msg_flags&MSG_OOB)
 		return -EOPNOTSUPP;
 
-	if (NULL == siocb->scm)
+	if (NULL == siocb->scm) {
 		siocb->scm = &scm;
+		memset(&scm, 0, sizeof(scm));
+	}
 	err = scm_send(sock, msg, siocb->scm);
 	if (err < 0)
 		return err;
 
 	if (msg->msg_namelen) {
+		err = -EINVAL;
 		if (addr->nl_family != AF_NETLINK)
-			return -EINVAL;
+			goto out;
 		dst_pid = addr->nl_pid;
 		dst_group = ffs(addr->nl_groups);
+		err =  -EPERM;
 		if (dst_group && !netlink_capable(sock, NL_NONROOT_SEND))
-			return -EPERM;
+			goto out;
 	} else {
 		dst_pid = nlk->dst_pid;
 		dst_group = nlk->dst_group;
@@ -1370,6 +1374,7 @@ static int netlink_sendmsg(struct kiocb *kiocb, struct socket *sock,
 	err = netlink_unicast(sk, skb, dst_pid, msg->msg_flags&MSG_DONTWAIT);
 
 out:
+	scm_destroy(siocb->scm);
 	return err;
 }
 
-- 
1.6.5.2.143.g8cc62

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