From 1498b3f1952ae539a7d5c356acf942d5f4c1aece Mon Sep 17 00:00:00 2001 From: Satyam Sharma Date: Mon, 9 Jul 2007 15:22:23 -0700 Subject: [NETPOLL]: Fix a leak-n-bug in netpoll_cleanup() 93ec2c723e3f8a216dde2899aeb85c648672bc6b applied excessive duct tape to the netpoll beast's netpoll_cleanup(), thus substituting one leak with another, and opening up a little buglet :-) net_device->npinfo (netpoll_info) is a shared and refcounted object and cannot simply be set NULL the first time netpoll_cleanup() is called. Otherwise, further netpoll_cleanup()'s see np->dev->npinfo == NULL and become no-ops, thus leaking. And it's a bug too: the first call to netpoll_cleanup() would thus (annoyingly) "disable" other (still alive) netpolls too. Maybe nobody noticed this because netconsole (only user of netpoll) never supported multiple netpoll objects earlier. This is a trivial and obvious one-line fixlet. Signed-off-by: Satyam Sharma Signed-off-by: David S. Miller --- net/core/netpoll.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net/core') diff --git a/net/core/netpoll.c b/net/core/netpoll.c index 4b06d1936375..de1b26aa5720 100644 --- a/net/core/netpoll.c +++ b/net/core/netpoll.c @@ -783,7 +783,6 @@ void netpoll_cleanup(struct netpoll *np) spin_unlock_irqrestore(&npinfo->rx_lock, flags); } - np->dev->npinfo = NULL; if (atomic_dec_and_test(&npinfo->refcnt)) { skb_queue_purge(&npinfo->arp_tx); skb_queue_purge(&npinfo->txq); @@ -796,6 +795,7 @@ void netpoll_cleanup(struct netpoll *np) kfree_skb(skb); } kfree(npinfo); + np->dev->npinfo = NULL; } } -- cgit v1.2.3