netdev - [PATCH][NET][BRIDGE] br_if: oops in port_carrier

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Message-ID: <20070212102848.GA4275@ff.dom.local>
Date:	Mon, 12 Feb 2007 11:28:48 +0100
From:	Jarek Poplawski <jarkao2@...pl>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, netdev@...r.kernel.org,
	"bugme-daemon\@kernel-bugs\.osdl\.org" 
	<bugme-daemon@...zilla.kernel.org>, pterjan@...il.com
Subject: [PATCH][NET][BRIDGE] br_if: oops in port_carrier_check

Here is my patch proposal for testing.
If it doesn't work - forget about it.
(Prepared with 2.6.20-git6 but could
be applied to 2.6.20 also.)

Jarek P.


dev_hold/dev_put added to prevent dev kfree
during port_carrier_check runnig, while dev
and port are removed.

Submitted and tested by: Pascal Terjan <pterjan@...il.com>

Signed-off-by: Jarek Poplawski <jarkao2@...pl>

---

diff -Nurp linux-2.6.20-git6-/net/bridge/br_if.c linux-2.6.20-git6/net/bridge/br_if.c
--- linux-2.6.20-git6-/net/bridge/br_if.c	2007-02-12 10:20:14.000000000 +0100
+++ linux-2.6.20-git6/net/bridge/br_if.c	2007-02-12 10:36:58.000000000 +0100
@@ -108,6 +108,7 @@ static void port_carrier_check(struct wo
 		spin_unlock_bh(&br->lock);
 	}
 done:
+	dev_put(dev);
 	rtnl_unlock();
 }
 
@@ -161,7 +162,8 @@ static void del_nbp(struct net_bridge_po
 
 	dev_set_promiscuity(dev, -1);
 
-	cancel_delayed_work(&p->carrier_check);
+	if (cancel_delayed_work(&p->carrier_check))
+		dev_put(dev);
 
 	spin_lock_bh(&br->lock);
 	br_stp_disable_port(p);
@@ -444,7 +446,9 @@ int br_add_if(struct net_bridge *br, str
 	spin_lock_bh(&br->lock);
 	br_stp_recalculate_bridge_id(br);
 	br_features_recompute(br);
-	schedule_delayed_work(&p->carrier_check, BR_PORT_DEBOUNCE);
+	if (schedule_delayed_work(&p->carrier_check, BR_PORT_DEBOUNCE))
+		dev_hold(dev);
+
 	spin_unlock_bh(&br->lock);
 
 	dev_set_mtu(br->dev, br_min_mtu(br));
-
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