This is a note to let you know that I've just added the patch titled
igb: close/suspend race in netif_device_detach
to the 4.4-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: igb-close-suspend-race-in-netif_device_detach.patch and it can be found in the queue-4.4 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 Sun Nov 19 12:02:55 CET 2017
From: Todd Fujinaka todd.fujinaka@intel.com Date: Tue, 15 Nov 2016 08:54:26 -0800 Subject: igb: close/suspend race in netif_device_detach
From: Todd Fujinaka todd.fujinaka@intel.com
[ Upstream commit 9474933caf21a4cb5147223dca1551f527aaac36 ]
Similar to ixgbe, when an interface is part of a namespace it is possible that igb_close() may be called while __igb_shutdown() is running which ends up in a double free WARN and/or a BUG in free_msi_irqs().
Extend the rtnl_lock() to protect the call to netif_device_detach() and igb_clear_interrupt_scheme() in __igb_shutdown() and check for netif_device_present() to avoid calling igb_clear_interrupt_scheme() a second time in igb_close().
Also extend the rtnl lock in igb_resume() to netif_device_attach().
Signed-off-by: Todd Fujinaka todd.fujinaka@intel.com Acked-by: Alexander Duyck alexander.h.duyck@intel.com Tested-by: Aaron Brown aaron.f.brown@intel.com Signed-off-by: Jeff Kirsher jeffrey.t.kirsher@intel.com Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/intel/igb/igb_main.c | 21 ++++++++++++--------- 1 file changed, 12 insertions(+), 9 deletions(-)
--- a/drivers/net/ethernet/intel/igb/igb_main.c +++ b/drivers/net/ethernet/intel/igb/igb_main.c @@ -3172,7 +3172,9 @@ static int __igb_close(struct net_device
static int igb_close(struct net_device *netdev) { - return __igb_close(netdev, false); + if (netif_device_present(netdev)) + return __igb_close(netdev, false); + return 0; }
/** @@ -7325,12 +7327,14 @@ static int __igb_shutdown(struct pci_dev int retval = 0; #endif
+ rtnl_lock(); netif_device_detach(netdev);
if (netif_running(netdev)) __igb_close(netdev, true);
igb_clear_interrupt_scheme(adapter); + rtnl_unlock();
#ifdef CONFIG_PM retval = pci_save_state(pdev); @@ -7450,16 +7454,15 @@ static int igb_resume(struct device *dev
wr32(E1000_WUS, ~0);
- if (netdev->flags & IFF_UP) { - rtnl_lock(); + rtnl_lock(); + if (!err && netif_running(netdev)) err = __igb_open(netdev, true); - rtnl_unlock(); - if (err) - return err; - }
- netif_device_attach(netdev); - return 0; + if (!err) + netif_device_attach(netdev); + rtnl_unlock(); + + return err; }
static int igb_runtime_idle(struct device *dev)
Patches currently in stable-queue which might be from todd.fujinaka@intel.com are
queue-4.4/igb-close-suspend-race-in-netif_device_detach.patch