From d46880faad42eea3c68a525fec579bcf104d2f55 Mon Sep 17 00:00:00 2001
From: Matthew Leach <matthew.leach@arm.com>
Date: Tue, 11 Mar 2014 11:58:27 +0000
Subject: [PATCH] net: socket: error on a negative msg_namelen

[ Upstream commit dbb490b96584d4e958533fb637f08b557f505657 ]

When copying in a struct msghdr from the user, if the user has set the
msg_namelen parameter to a negative value it gets clamped to a valid
size due to a comparison between signed and unsigned values.

Ensure the syscall errors when the user passes in a negative value.

Signed-off-by: Matthew Leach <matthew.leach@arm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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