From: Pavel Emelyanov <xemul@openvz.org>
To: David Miller <davem@davemloft.net>
Cc: Stephen Hemminger <shemminger@linux-foundation.org>,
Linux Netdev List <netdev@vger.kernel.org>
Subject: [PATCH] netpoll: don't dereference NULL dev from np
Date: Mon, 11 May 2009 14:36:35 +0400 [thread overview]
Message-ID: <4A07FFB3.70308@openvz.org> (raw)
It looks like the dev in netpoll_poll can be NULL - at lease it's
checked at the function beginning. Thus the dev->netde_ops dereference
looks dangerous.
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
---
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index b5873bd..64f51ee 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -175,9 +175,13 @@ static void service_arp_queue(struct netpoll_info *npi)
void netpoll_poll(struct netpoll *np)
{
struct net_device *dev = np->dev;
- const struct net_device_ops *ops = dev->netdev_ops;
+ const struct net_device_ops *ops;
+
+ if (!dev || !netif_running(dev))
+ return;
- if (!dev || !netif_running(dev) || !ops->ndo_poll_controller)
+ ops = dev->netdev_ops;
+ if (!ops->ndo_poll_controller)
return;
/* Process pending work on NIC */
next reply other threads:[~2009-05-11 10:37 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-11 10:36 Pavel Emelyanov [this message]
2009-05-18 3:38 ` [PATCH] netpoll: don't dereference NULL dev from np David Miller
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