linux-kernel - [141/262] netconsole: enable netconsole can make net

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Date:	Wed, 09 Nov 2011 13:27:43 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Gao feng <gaofeng@...fujitsu.com>,
	Flavio Leitner <fbl@...hat.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [141/262] netconsole: enable netconsole can make net_device refcnt incorrent

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

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


From: Gao feng <gaofeng@...fujitsu.com>

[ Upstream commit d5123480b1d6f7d1a5fe1a13520cef88fb5d4c84 ]

There is no check if netconsole is enabled current.
so when exec echo 1 > enabled;
the reference of net_device will increment always.

Signed-off-by: Gao feng <gaofeng@...fujitsu.com>
Acked-by: Flavio Leitner <fbl@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 drivers/net/netconsole.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -307,6 +307,11 @@ static ssize_t store_enabled(struct netc
 		return err;
 	if (enabled < 0 || enabled > 1)
 		return -EINVAL;
+	if (enabled == nt->enabled) {
+		printk(KERN_INFO "netconsole: network logging has already %s\n",
+				nt->enabled ? "started" : "stopped");
+		return -EINVAL;
+	}
 
 	if (enabled) {	/* 1 */
 


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