net/ixgbe/base: add bounds check in LED functions

Do parameter check to prevent exceptional value being written into
register.

Signed-off-by: Xiao Wang <xiao.w.wang@intel.com>
Acked-by: Wenzhuo Lu <wenzhuo.lu@intel.com>

diff --git a/drivers/net/ixgbe/base/ixgbe_common.c b/drivers/net/ixgbe/base/ixgbe_common.c
index 1c7263d..c01f919 100644 (file)
--- a/drivers/net/ixgbe/base/ixgbe_common.c
+++ b/drivers/net/ixgbe/base/ixgbe_common.c
@@ -1133,6 +1133,9 @@ s32 ixgbe_led_on_generic(struct ixgbe_hw *hw, u32 index)
 
        DEBUGFUNC("ixgbe_led_on_generic");
 
+       if (index > 3)
+               return IXGBE_ERR_PARAM;
+
        /* To turn on the LED, set mode to ON. */
        led_reg &= ~IXGBE_LED_MODE_MASK(index);
        led_reg |= IXGBE_LED_ON << IXGBE_LED_MODE_SHIFT(index);
@@ -1153,6 +1156,9 @@ s32 ixgbe_led_off_generic(struct ixgbe_hw *hw, u32 index)
 
        DEBUGFUNC("ixgbe_led_off_generic");
 
+       if (index > 3)
+               return IXGBE_ERR_PARAM;
+
        /* To turn off the LED, set mode to OFF. */
        led_reg &= ~IXGBE_LED_MODE_MASK(index);
        led_reg |= IXGBE_LED_OFF << IXGBE_LED_MODE_SHIFT(index);
@@ -3388,6 +3394,9 @@ s32 ixgbe_blink_led_start_generic(struct ixgbe_hw *hw, u32 index)
 
        DEBUGFUNC("ixgbe_blink_led_start_generic");
 
+       if (index > 3)
+               return IXGBE_ERR_PARAM;
+
        /*
         * Link must be up to auto-blink the LEDs;
         * Force it if link is down.
@@ -3433,6 +3442,10 @@ s32 ixgbe_blink_led_stop_generic(struct ixgbe_hw *hw, u32 index)
 
        DEBUGFUNC("ixgbe_blink_led_stop_generic");
 
+       if (index > 3)
+               return IXGBE_ERR_PARAM;
+
+
        ret_val = hw->mac.ops.prot_autoc_read(hw, &locked, &autoc_reg);
        if (ret_val != IXGBE_SUCCESS)
                goto out;

diff --git a/drivers/net/ixgbe/base/ixgbe_x540.c b/drivers/net/ixgbe/base/ixgbe_x540.c
index 31dead0..24e9c93 100644 (file)
--- a/drivers/net/ixgbe/base/ixgbe_x540.c
+++ b/drivers/net/ixgbe/base/ixgbe_x540.c
@@ -982,6 +982,9 @@ s32 ixgbe_blink_led_start_X540(struct ixgbe_hw *hw, u32 index)
 
        DEBUGFUNC("ixgbe_blink_led_start_X540");
 
+       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.
@@ -1016,6 +1019,9 @@ 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;
+
        DEBUGFUNC("ixgbe_blink_led_stop_X540");
 
        /* Restore the LED to its default value. */