linux-kernel - [ 10/42] caif: Fix missing msg_namelen update in caif_seqpkt

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Date:	Mon, 29 Apr 2013 12:01:52 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Mathias Krause <minipli@...glemail.com>,
	Sjur Braendeland <sjur.brandeland@...ricsson.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 10/42] caif: Fix missing msg_namelen update in caif_seqpkt_recvmsg()

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

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


From: Mathias Krause <minipli@...glemail.com>

[ Upstream commit 2d6fbfe733f35c6b355c216644e08e149c61b271 ]

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 caif_seqpkt_recvmsg() not filling the msg_name in case it was
set.

Signed-off-by: Mathias Krause <minipli@...glemail.com>
Cc: Sjur Braendeland <sjur.brandeland@...ricsson.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/caif/caif_socket.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/net/caif/caif_socket.c
+++ b/net/caif/caif_socket.c
@@ -286,6 +286,8 @@ static int caif_seqpkt_recvmsg(struct ki
 	if (m->msg_flags&MSG_OOB)
 		goto read_error;
 
+	m->msg_namelen = 0;
+
 	skb = skb_recv_datagram(sk, flags, 0 , &ret);
 	if (!skb)
 		goto read_error;


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