netdev - [net-next 11/18] i40evf: check for msix

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Date:   Sat,  3 Dec 2016 01:19:23 -0800
From:   Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:     davem@...emloft.net
Cc:     Alan Brady <alan.brady@...el.com>, netdev@...r.kernel.org,
        nhorman@...hat.com, sassmann@...hat.com, jogreene@...hat.com,
        guru.anbalagane@...cle.com,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 11/18] i40evf: check for msix_entries null dereference

From: Alan Brady <alan.brady@...el.com>

It is possible for msix_entries to be freed by a previous suspend/remove
before a VF is closed.  This patch fixes the issue by checking for NULL
before dereferencing msix_entries and returning early in the case where
it is NULL within the i40evf_close code path.  Without this patch it is
possible to trigger a kernel panic through NULL dereference.

Change-ID: I92a2746e82533a889e25f91578eac9abd0388ae2
Signed-off-by: Alan Brady <alan.brady@...el.com>
Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/i40evf/i40evf_main.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_main.c b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
index f04ac36..420e545 100644
--- a/drivers/net/ethernet/intel/i40evf/i40evf_main.c
+++ b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
@@ -631,6 +631,9 @@ static void i40evf_free_traffic_irqs(struct i40evf_adapter *adapter)
 {
 	int vector, irq_num, q_vectors;
 
+	if (!adapter->msix_entries)
+		return;
+
 	q_vectors = adapter->num_msix_vectors - NONQ_VECS;
 
 	for (vector = 0; vector < q_vectors; vector++) {
@@ -1443,6 +1446,9 @@ static void i40evf_free_q_vectors(struct i40evf_adapter *adapter)
  **/
 void i40evf_reset_interrupt_capability(struct i40evf_adapter *adapter)
 {
+	if (!adapter->msix_entries)
+		return;
+
 	pci_disable_msix(adapter->pdev);
 	kfree(adapter->msix_entries);
 	adapter->msix_entries = NULL;
-- 
2.9.3