| From ce54b2c8e2d39d06f18098d42ebe8f404c45f531 Mon Sep 17 00:00:00 2001 |
| From: Mathias Krause <minipli@googlemail.com> |
| Date: Sun, 7 Apr 2013 01:51:54 +0000 |
| Subject: iucv: Fix missing msg_namelen update in iucv_sock_recvmsg() |
| |
| |
| 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 |
| @@ -1331,6 +1331,8 @@ 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) && |
| skb_queue_empty(&iucv->backlog_skb_q) && |
| skb_queue_empty(&sk->sk_receive_queue) && |
