linux-kernel - [ 22/30] irda: Fix missing msg_namelen update in irda_recvmsg

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Message-Id: <20130429184357.773840525@linuxfoundation.org>
Date:	Mon, 29 Apr 2013 12:02:46 -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>,
	Samuel Ortiz <samuel@...tiz.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 22/30] irda: Fix missing msg_namelen update in irda_recvmsg_dgram()

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

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


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

[ Upstream commit 5ae94c0d2f0bed41d6718be743985d61b7f5c47d ]

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

Signed-off-by: Mathias Krause <minipli@...glemail.com>
Cc: Samuel Ortiz <samuel@...tiz.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/irda/af_irda.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/net/irda/af_irda.c
+++ b/net/irda/af_irda.c
@@ -1386,6 +1386,8 @@ static int irda_recvmsg_dgram(struct kio
 
 	IRDA_DEBUG(4, "%s()\n", __func__);
 
+	msg->msg_namelen = 0;
+
 	skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
 				flags & MSG_DONTWAIT, &err);
 	if (!skb)


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