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.

Fixes: ce0aa27ff3f6 ("sfp: add sfp-bus to bridge between network devices and sfp cages")
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/phy/sfp-bus.c b/drivers/net/phy/sfp-bus.c
index 8a1b1f4..ab64a14 100644 (file)
--- 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;