[141/262] netconsole: enable netconsole can make net_device refcnt incorrent
From: Greg KH
Date: Thu Nov 10 2011 - 00:07:51 EST
3.0-stable review patch. If anyone has any objections, please let me know.
------------------
From: Gao feng <gaofeng@xxxxxxxxxxxxxx>
[ 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@xxxxxxxxxxxxxx>
Acked-by: Flavio Leitner <fbl@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
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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