From d5123480b1d6f7d1a5fe1a13520cef88fb5d4c84 Mon Sep 17 00:00:00 2001 From: Gao feng Date: Tue, 11 Oct 2011 16:08:11 +0000 Subject: netconsole: enable netconsole can make net_device refcnt incorrent 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 Acked-by: Flavio Leitner Signed-off-by: David S. Miller --- drivers/net/netconsole.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'drivers/net/netconsole.c') diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c index ed2a3977c6e7..e8882023576b 100644 --- a/drivers/net/netconsole.c +++ b/drivers/net/netconsole.c @@ -307,6 +307,11 @@ static ssize_t store_enabled(struct netconsole_target *nt, 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 */ -- cgit v1.2.3