netdev - [PATCH net] sfp: fix sfp-bus oops when removing socket/upstream

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Message-Id: <E1eTyRJ-0007ZJ-IS@rmk-PC.armlinux.org.uk>
Date:   Tue, 26 Dec 2017 23:15:17 +0000
From:   Russell King <rmk+kernel@...linux.org.uk>
To:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org
Subject: [PATCH net] sfp: fix sfp-bus oops when removing socket/upstream

When we remove a socket or upstream, and the other side isn't
registered, we dereference a NULL pointer, causing a kernel oops.
Fix this.

Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
---
 drivers/net/phy/sfp-bus.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/sfp-bus.c b/drivers/net/phy/sfp-bus.c
index 8a1b1f4c1b7c..ab64a142b832 100644
--- a/drivers/net/phy/sfp-bus.c
+++ b/drivers/net/phy/sfp-bus.c
@@ -356,7 +356,8 @@ EXPORT_SYMBOL_GPL(sfp_register_upstream);
 void sfp_unregister_upstream(struct sfp_bus *bus)
 {
 	rtnl_lock();
-	sfp_unregister_bus(bus);
+	if (bus->sfp)
+		sfp_unregister_bus(bus);
 	bus->upstream = NULL;
 	bus->netdev = NULL;
 	rtnl_unlock();
@@ -459,7 +460,8 @@ EXPORT_SYMBOL_GPL(sfp_register_socket);
 void sfp_unregister_socket(struct sfp_bus *bus)
 {
 	rtnl_lock();
-	sfp_unregister_bus(bus);
+	if (bus->netdev)
+		sfp_unregister_bus(bus);
 	bus->sfp_dev = NULL;
 	bus->sfp = NULL;
 	bus->socket_ops = NULL;
-- 
2.7.4