[ 23/30] iucv: Fix missing msg_namelen update in iucv_sock_recvmsg()

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------


From: Mathias Krause <minipli@googlemail.com>

[ Upstream commit a5598bd9c087dc0efc250a5221e5d0e6f584ee88 ]

The current code does not fill the msg_name member in case it is set.
It also does not set the msg_namelen member to 0 and therefore makes
net/socket.c leak the local, uninitialized sockaddr_storage variable
to userland -- 128 bytes of kernel stack memory.

Fix that by simply setting msg_namelen to 0 as obviously nobody cared
about iucv_sock_recvmsg() not filling the msg_name in case it was set.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/iucv/af_iucv.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c
@@ -1157,6 +1157,8 @@ static int iucv_sock_recvmsg(struct kioc
 	struct sk_buff *skb, *rskb, *cskb;
 	int err = 0;
 
+	msg->msg_namelen = 0;
+
 	if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) &&
 	    skb_queue_empty(&iucv->backlog_skb_q) &&
 	    skb_queue_empty(&sk->sk_receive_queue) &&