netdev - [net-next 05/21] ixgbe: Add bounds check for x540 LED functions

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Date:   Fri, 30 Dec 2016 01:33:25 -0800
From:   Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:     davem@...emloft.net
Cc:     Tony Nguyen <anthony.l.nguyen@...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 05/21] ixgbe: Add bounds check for x540 LED functions

From: Tony Nguyen <anthony.l.nguyen@...el.com>

This is an extension of commit 003287e0f087 ("ixgbevf: Correct parameter
sent to LED function"); add bounds checking to x540 functions to ensure the
index is valid.

Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_x540.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_x540.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_x540.c
index e2ff823..afc4d16 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_x540.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_x540.c
@@ -780,8 +780,10 @@ s32 ixgbe_blink_led_start_X540(struct ixgbe_hw *hw, u32 index)
 	ixgbe_link_speed speed;
 	bool link_up;
 
-	/*
-	 * Link should be up in order for the blink bit in the LED control
+	if (index > 3)
+		return IXGBE_ERR_PARAM;
+
+	/* Link should be up in order for the blink bit in the LED control
 	 * register to work. Force link and speed in the MAC if link is down.
 	 * This will be reversed when we stop the blinking.
 	 */
@@ -814,6 +816,9 @@ s32 ixgbe_blink_led_stop_X540(struct ixgbe_hw *hw, u32 index)
 	u32 macc_reg;
 	u32 ledctl_reg;
 
+	if (index > 3)
+		return IXGBE_ERR_PARAM;
+
 	/* Restore the LED to its default value. */
 	ledctl_reg = IXGBE_READ_REG(hw, IXGBE_LEDCTL);
 	ledctl_reg &= ~IXGBE_LED_MODE_MASK(index);
-- 
2.9.3