From dbd99572c687037ca7ddb31df2d7fd364732c670 Mon Sep 17 00:00:00 2001 From: Mathias Krause Date: Sun, 7 Apr 2013 01:51:54 +0000 Subject: [PATCH] iucv: Fix missing msg_namelen update in iucv_sock_recvmsg() [ 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 Cc: Ursula Braun Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/iucv/af_iucv.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c index cd6f7a991d80..625bc50391cc 100644 --- a/net/iucv/af_iucv.c +++ b/net/iucv/af_iucv.c @@ -1331,6 +1331,8 @@ static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, 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) && -- 2.39.5