netdev - [net-next 20/22] i40e: Fix for division by zero

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Message-Id: <1477952992-125662-21-git-send-email-jeffrey.t.kirsher@intel.com>
Date:   Mon, 31 Oct 2016 15:29:50 -0700
From:   Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:     davem@...emloft.net
Cc:     Michal Kosiarz <michal.kosiarz@...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 20/22] i40e: Fix for division by zero

From: Michal Kosiarz <michal.kosiarz@...el.com>

For some cases when reading from device are incorrect or image is
incorrect, this part of code causes crash due to division by zero.

Change-ID: I8961029a7a87b0a479995823ef8fcbf6471405e1
Signed-off-by: Michal Kosiarz <michal.kosiarz@...el.com>
Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/i40e/i40e_common.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_common.c b/drivers/net/ethernet/intel/i40e/i40e_common.c
index a475946..98791ba 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_common.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_common.c
@@ -3313,8 +3313,10 @@ static void i40e_parse_discover_capabilities(struct i40e_hw *hw, void *buff,
 	/* partition id is 1-based, and functions are evenly spread
 	 * across the ports as partitions
 	 */
-	hw->partition_id = (hw->pf_id / hw->num_ports) + 1;
-	hw->num_partitions = num_functions / hw->num_ports;
+	if (hw->num_ports != 0) {
+		hw->partition_id = (hw->pf_id / hw->num_ports) + 1;
+		hw->num_partitions = num_functions / hw->num_ports;
+	}
 
 	/* additional HW specific goodies that might
 	 * someday be HW version specific
-- 
2.7.4