netdev - [PATCH net-next 1/2] net: linkwatch: add check for netdevice being present to linkwatch_do

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Message-ID: <11beeaa9-57d5-e641-9486-f2ba202d0998@gmail.com>
Date:   Tue, 18 Sep 2018 21:55:36 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        David Miller <davem@...emloft.net>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH net-next 1/2] net: linkwatch: add check for netdevice being
 present to linkwatch_do_dev

When bringing down the netdevice (incl. detaching it) and calling
netif_carrier_off directly or indirectly the latter triggers an
asynchronous linkwatch event.
This linkwatch event eventually may fail to access chip registers in
the ndo_get_stats/ndo_get_stats64 callback because the device isn't
accessible any longer, see call trace in [0].

To prevent this scenario don't check for IFF_UP only, but also make
sure that the netdevice is present.

[0] https://lists.openwall.net/netdev/2018/03/15/62

Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 net/core/link_watch.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/link_watch.c b/net/core/link_watch.c
index e38e641e9..7f51efb2b 100644
--- a/net/core/link_watch.c
+++ b/net/core/link_watch.c
@@ -155,7 +155,7 @@ static void linkwatch_do_dev(struct net_device *dev)
 	clear_bit(__LINK_STATE_LINKWATCH_PENDING, &dev->state);
 
 	rfc2863_policy(dev);
-	if (dev->flags & IFF_UP) {
+	if (dev->flags & IFF_UP && netif_device_present(dev)) {
 		if (netif_carrier_ok(dev))
 			dev_activate(dev);
 		else
-- 
2.19.0