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authorSatyam Sharma <ssatyam@cse.iitk.ac.in>2007-07-09 15:22:23 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-07-10 22:19:02 -0700
commit1498b3f1952ae539a7d5c356acf942d5f4c1aece (patch)
tree70307da369971a106f817c47b0b9cf9d8e3d574f
parent5f1de3ec661e7b08348f565b7ca17586e7e94fc5 (diff)
downloadop-kernel-dev-1498b3f1952ae539a7d5c356acf942d5f4c1aece.zip
op-kernel-dev-1498b3f1952ae539a7d5c356acf942d5f4c1aece.tar.gz
[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 <ssatyam@cse.iitk.ac.in> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/core/netpoll.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index 4b06d19..de1b26a 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;
}
}
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