[ 12/42] iucv: Fix missing msg_namelen update in iucv_sock_recvmsg()
From: Greg Kroah-Hartman
Date: Mon Apr 29 2013 - 15:43:21 EST
3.8-stable review patch. If anyone has any objections, please let me know.
From: Mathias Krause <minipli@xxxxxxxxxxxxxx>
[ 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@xxxxxxxxxxxxxx>
Cc: Ursula Braun <ursula.braun@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
net/iucv/af_iucv.c | 2 ++
1 file changed, 2 insertions(+)
@@ -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) &&
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