Patch "rocker: fix possible null pointer dereference in rocker_router_fib_event_work" has been added to the 4.15-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    rocker: fix possible null pointer dereference in rocker_router_fib_event_work

to the 4.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     rocker-fix-possible-null-pointer-dereference-in-rocker_router_fib_event_work.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Wed Feb  7 11:29:33 PST 2018
From: Jiri Pirko <jiri@mellanox.com>
Date: Thu, 1 Feb 2018 12:21:15 +0100
Subject: rocker: fix possible null pointer dereference in rocker_router_fib_event_work

From: Jiri Pirko <jiri@mellanox.com>


[ Upstream commit a83165f00f16c0e0ef5b7cec3cbd0d4788699265 ]

Currently, rocker user may experience following null pointer
derefence bug:

[    3.062141] BUG: unable to handle kernel NULL pointer dereference at 00000000000000d0
[    3.065163] IP: rocker_router_fib_event_work+0x36/0x110 [rocker]

The problem is uninitialized rocker->wops pointer that is initialized
only with the first initialized port. So move the port initialization
before registering the fib events.

Fixes: 936bd486564a ("rocker: use FIB notifications instead of switchdev calls")
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/rocker/rocker_main.c |   18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

--- a/drivers/net/ethernet/rocker/rocker_main.c
+++ b/drivers/net/ethernet/rocker/rocker_main.c
@@ -2902,6 +2902,12 @@ static int rocker_probe(struct pci_dev *
 		goto err_alloc_ordered_workqueue;
 	}
 
+	err = rocker_probe_ports(rocker);
+	if (err) {
+		dev_err(&pdev->dev, "failed to probe ports\n");
+		goto err_probe_ports;
+	}
+
 	/* Only FIBs pointing to our own netdevs are programmed into
 	 * the device, so no need to pass a callback.
 	 */
@@ -2918,22 +2924,16 @@ static int rocker_probe(struct pci_dev *
 
 	rocker->hw.id = rocker_read64(rocker, SWITCH_ID);
 
-	err = rocker_probe_ports(rocker);
-	if (err) {
-		dev_err(&pdev->dev, "failed to probe ports\n");
-		goto err_probe_ports;
-	}
-
 	dev_info(&pdev->dev, "Rocker switch with id %*phN\n",
 		 (int)sizeof(rocker->hw.id), &rocker->hw.id);
 
 	return 0;
 
-err_probe_ports:
-	unregister_switchdev_notifier(&rocker_switchdev_notifier);
 err_register_switchdev_notifier:
 	unregister_fib_notifier(&rocker->fib_nb);
 err_register_fib_notifier:
+	rocker_remove_ports(rocker);
+err_probe_ports:
 	destroy_workqueue(rocker->rocker_owq);
 err_alloc_ordered_workqueue:
 	free_irq(rocker_msix_vector(rocker, ROCKER_MSIX_VEC_EVENT), rocker);
@@ -2961,9 +2961,9 @@ static void rocker_remove(struct pci_dev
 {
 	struct rocker *rocker = pci_get_drvdata(pdev);
 
-	rocker_remove_ports(rocker);
 	unregister_switchdev_notifier(&rocker_switchdev_notifier);
 	unregister_fib_notifier(&rocker->fib_nb);
+	rocker_remove_ports(rocker);
 	rocker_write32(rocker, CONTROL, ROCKER_CONTROL_RESET);
 	destroy_workqueue(rocker->rocker_owq);
 	free_irq(rocker_msix_vector(rocker, ROCKER_MSIX_VEC_EVENT), rocker);


Patches currently in stable-queue which might be from jiri@mellanox.com are

queue-4.15/net_sched-get-rid-of-rcu_barrier-in-tcf_block_put_ext.patch
queue-4.15/rocker-fix-possible-null-pointer-dereference-in-rocker_router_fib_event_work.patch
queue-4.15/net-sched-fix-use-after-free-in-tcf_block_put_ext.patch