linux-kernel - [PATCH 3.2 05/94] net: socket: error on a negative msg

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Message-ID: <lsq.1398647481.569969857@decadent.org.uk>
Date:	Mon, 28 Apr 2014 02:11:21 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Matthew Leach" <matthew.leach@....com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.2 05/94] net: socket: error on a negative msg_namelen

3.2.58-rc1 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: Ben Hutchings <ben@...adent.org.uk>
---
 net/socket.c | 4 ++++
 1 file changed, 4 insertions(+)

--- a/net/socket.c
+++ b/net/socket.c
@@ -1884,6 +1884,10 @@ static int copy_msghdr_from_user(struct
 {
 	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;

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