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From: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
To: davem@davemloft.net
Cc: Stefan Assmann <sassmann@kpanic.de>,
	netdev@vger.kernel.org, nhorman@redhat.com, sassmann@redhat.com,
	stable@vger.kernel.org, Andrew Bowers <andrewx.bowers@intel.com>,
	Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Subject: [net-next v2 02/13] i40e: check __I40E_VF_DISABLE bit in i40e_sync_filters_subtask
Date: Wed, 11 Sep 2019 09:50:03 -0700
Message-ID: <20190911165014.10742-3-jeffrey.t.kirsher@intel.com> (raw)
In-Reply-To: <20190911165014.10742-1-jeffrey.t.kirsher@intel.com>

From: Stefan Assmann <sassmann@kpanic.de>

While testing VF spawn/destroy the following panic occurred.

BUG: unable to handle kernel NULL pointer dereference at 0000000000000029
[...]
Workqueue: i40e i40e_service_task [i40e]
RIP: 0010:i40e_sync_vsi_filters+0x6fd/0xc60 [i40e]
[...]
Call Trace:
 ? __switch_to_asm+0x35/0x70
 ? __switch_to_asm+0x41/0x70
 ? __switch_to_asm+0x35/0x70
 ? _cond_resched+0x15/0x30
 i40e_sync_filters_subtask+0x56/0x70 [i40e]
 i40e_service_task+0x382/0x11b0 [i40e]
 ? __switch_to_asm+0x41/0x70
 ? __switch_to_asm+0x41/0x70
 process_one_work+0x1a7/0x3b0
 worker_thread+0x30/0x390
 ? create_worker+0x1a0/0x1a0
 kthread+0x112/0x130
 ? kthread_bind+0x30/0x30
 ret_from_fork+0x35/0x40

Investigation revealed a race where pf->vf[vsi->vf_id].trusted may get
accessed by the watchdog via i40e_sync_filters_subtask() although
i40e_free_vfs() already free'd pf->vf.
To avoid this the call to i40e_sync_vsi_filters() in
i40e_sync_filters_subtask() needs to be guarded by __I40E_VF_DISABLE,
which is also used by i40e_free_vfs().

Note: put the __I40E_VF_DISABLE check after the
__I40E_MACVLAN_SYNC_PENDING check as the latter is more likely to
trigger.

CC: stable@vger.kernel.org
Signed-off-by: Stefan Assmann <sassmann@kpanic.de>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---
 drivers/net/ethernet/intel/i40e/i40e_main.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index e9f2f276bf27..3e2e465f43f9 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -2592,6 +2592,10 @@ static void i40e_sync_filters_subtask(struct i40e_pf *pf)
 		return;
 	if (!test_and_clear_bit(__I40E_MACVLAN_SYNC_PENDING, pf->state))
 		return;
+	if (test_and_set_bit(__I40E_VF_DISABLE, pf->state)) {
+		set_bit(__I40E_MACVLAN_SYNC_PENDING, pf->state);
+		return;
+	}
 
 	for (v = 0; v < pf->num_alloc_vsi; v++) {
 		if (pf->vsi[v] &&
@@ -2606,6 +2610,7 @@ static void i40e_sync_filters_subtask(struct i40e_pf *pf)
 			}
 		}
 	}
+	clear_bit(__I40E_VF_DISABLE, pf->state);
 }
 
 /**
-- 
2.21.0


  parent reply index

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-11 16:50 [net-next v2 00/13][pull request] Intel Wired LAN Driver Updates 2019-09-11 Jeff Kirsher
2019-09-11 16:50 ` [net-next v2 01/13] ixgbe: fix memory leaks Jeff Kirsher
2019-09-11 16:50 ` Jeff Kirsher [this message]
2019-09-11 16:50 ` [net-next v2 03/13] ixgbe: use skb_get_queue_mapping in tx path Jeff Kirsher
2019-09-11 16:50 ` [net-next v2 04/13] i40e: use ktime_get_real_ts64 instead of ktime_to_timespec64 Jeff Kirsher
2019-09-11 16:50 ` [net-next v2 05/13] i40e: remove I40E_AQC_ADD_CLOUD_FILTER_OIP Jeff Kirsher
2019-09-11 16:50 ` [net-next v2 06/13] i40e: mark additional missing bits as reserved Jeff Kirsher
2019-09-11 16:50 ` [net-next v2 07/13] i40e: fix missed "Negotiated" string in i40e_print_link_message() Jeff Kirsher
2019-09-11 16:50 ` [net-next v2 08/13] i40e: Fix message for other card without FEC Jeff Kirsher
2019-09-11 16:50 ` [net-next v2 09/13] i40e: use BIT macro to specify the cloud filter field flags Jeff Kirsher
2019-09-11 16:50 ` [net-next v2 10/13] i40e: clear __I40E_VIRTCHNL_OP_PENDING on invalid min Tx rate Jeff Kirsher
2019-09-11 16:50 ` [net-next v2 11/13] iavf: fix MAC address setting for VFs when filter is rejected Jeff Kirsher
2019-09-11 16:50 ` [net-next v2 12/13] net/ixgbevf: make array api static const, makes object smaller Jeff Kirsher
2019-09-11 16:50 ` [net-next v2 13/13] i40e: fix potential RX buffer starvation for AF_XDP Jeff Kirsher
2019-09-13 13:48 ` [net-next v2 00/13][pull request] Intel Wired LAN Driver Updates 2019-09-11 David Miller

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