linux-kernel - [PATCH 3.14 41/43] net: rds: use correct size for max unacked packets and bytes

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Message-Id: <20150417132557.771695623@linuxfoundation.org>
Date:	Fri, 17 Apr 2015 15:29:15 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Sasha Levin <sasha.levin@...cle.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.14 41/43] net: rds: use correct size for max unacked packets and bytes

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

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

From: Sasha Levin <sasha.levin@...cle.com>

commit db27ebb111e9f69efece08e4cb6a34ff980f8896 upstream.

Max unacked packets/bytes is an int while sizeof(long) was used in the
sysctl table.

This means that when they were getting read we'd also leak kernel memory
to userspace along with the timeout values.

Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/rds/sysctl.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/net/rds/sysctl.c
+++ b/net/rds/sysctl.c
@@ -71,14 +71,14 @@ static struct ctl_table rds_sysctl_rds_t
 	{
 		.procname	= "max_unacked_packets",
 		.data		= &rds_sysctl_max_unacked_packets,
-		.maxlen         = sizeof(unsigned long),
+		.maxlen         = sizeof(int),
 		.mode           = 0644,
 		.proc_handler   = proc_dointvec,
 	},
 	{
 		.procname	= "max_unacked_bytes",
 		.data		= &rds_sysctl_max_unacked_bytes,
-		.maxlen         = sizeof(unsigned long),
+		.maxlen         = sizeof(int),
 		.mode           = 0644,
 		.proc_handler   = proc_dointvec,
 	},


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