linux-kernel - [PATCH 3.8 008/133] net: socket: error on a negative msg

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Message-Id: <1398197671-12786-9-git-send-email-kamal@canonical.com>
Date:	Tue, 22 Apr 2014 13:12:26 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Matthew Leach <matthew.leach@....com>,
	"David S. Miller" <davem@...emloft.net>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.8 008/133] net: socket: error on a negative msg_namelen

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

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

From: Matthew Leach <matthew.leach@....com>

[ 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@....com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 net/socket.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/socket.c b/net/socket.c
index 57d7a85..17a8cdb 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1988,6 +1988,10 @@ static int copy_msghdr_from_user(struct msghdr *kmsg,
 {
 	if (copy_from_user(kmsg, umsg, sizeof(struct msghdr)))
 		return -EFAULT;
+
+	if (kmsg->msg_namelen < 0)
+		return -EINVAL;
+
 	if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
 		kmsg->msg_namelen = sizeof(struct sockaddr_storage);
 	return 0;
-- 
1.9.1

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