netdev - [net-next 02/14] i40e: prevent null pointer exception in dump descriptor

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Date:	Tue, 17 Dec 2013 22:44:30 -0800
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net
Cc:	Shannon Nelson <shannon.nelson@...el.com>, netdev@...r.kernel.org,
	gospo@...hat.com, sassmann@...hat.com,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 02/14] i40e: prevent null pointer exception in dump descriptor

From: Shannon Nelson <shannon.nelson@...el.com>

Check that rings were allocated before trying to reference them.

Change-Id: I33151e55ab7a7a305fecdb88ccb2709ac246b7c7
Signed-off-by: Shannon Nelson <shannon.nelson@...el.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/i40e/i40e_debugfs.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_debugfs.c b/drivers/net/ethernet/intel/i40e/i40e_debugfs.c
index 18296f8..0ce0664 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_debugfs.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_debugfs.c
@@ -782,6 +782,12 @@ static void i40e_dbg_dump_desc(int cnt, int vsi_seid, int ring_id, int desc_n,
 			dev_info(&pf->pdev->dev, "dump desc tx <vsi_seid> <ring_id> [<desc_n>]\n");
 		return;
 	}
+	if (!vsi->tx_rings) {
+		dev_info(&pf->pdev->dev,
+			 "descriptor rings have not been allocated for vsi %d\n",
+			 vsi_seid);
+		return;
+	}
 	if (is_rx_ring)
 		ring = *vsi->rx_rings[ring_id];
 	else
-- 
1.8.3.1

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