linux-kernel - [ 23/48] net: rds: use correct size for max unacked packets and bytes

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Message-Id: <20150515080531.269597806@1wt.eu>
Date:	Fri, 15 May 2015 10:05:53 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Sasha Levin <sasha.levin@...cle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Ben Hutchings <ben@...adent.org.uk>, Willy Tarreau <w@....eu>
Subject: [ 23/48] net: rds: use correct size for max unacked packets and
 bytes

2.6.32-longterm 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: Ben Hutchings <ben@...adent.org.uk>
(cherry picked from commit 3760b67b3e419b9ac42a45417491360a14a35357)

Signed-off-by: Willy Tarreau <w@....eu>
---
 net/rds/sysctl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/rds/sysctl.c b/net/rds/sysctl.c
index 307dc5c..870e808 100644
--- a/net/rds/sysctl.c
+++ b/net/rds/sysctl.c
@@ -74,7 +74,7 @@ static ctl_table rds_sysctl_rds_table[] = {
 		.ctl_name	= CTL_UNNUMBERED,
 		.procname	= "max_unacked_packets",
 		.data		= &rds_sysctl_max_unacked_packets,
-		.maxlen         = sizeof(unsigned long),
+		.maxlen         = sizeof(int),
 		.mode           = 0644,
 		.proc_handler   = &proc_dointvec,
 	},
@@ -82,7 +82,7 @@ static ctl_table rds_sysctl_rds_table[] = {
 		.ctl_name	= CTL_UNNUMBERED,
 		.procname	= "max_unacked_bytes",
 		.data		= &rds_sysctl_max_unacked_bytes,
-		.maxlen         = sizeof(unsigned long),
+		.maxlen         = sizeof(int),
 		.mode           = 0644,
 		.proc_handler   = &proc_dointvec,
 	},
-- 
1.7.12.2.21.g234cd45.dirty



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