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 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
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-4.14 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 11:29:20 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-4.14/rocker-fix-possible-null-pointer-dereference-in-rocker_router_fib_event_work.patch