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Subject[PATCH 4.14 052/118] sfp: fix sfp-bus oops when removing socket/upstream
Date
4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Russell King <rmk+kernel@armlinux.org.uk>


[ Upstream commit 0b2122e4934c7783d336397864e34ee53aad0965 ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/phy/sfp-bus.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/net/phy/sfp-bus.c
+++ b/drivers/net/phy/sfp-bus.c
@@ -359,7 +359,8 @@ 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();
@@ -464,7 +465,8 @@ 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;

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