ice: Fix insufficient memory issue in ice_aq_manage_mac_read

For the MAC read operation, the device can return up to two (LAN and WoL)
MAC addresses. Without access to adequate memory, the device will return
an error. Fixed this by allocating the right amount of memory. Also, logic
to detect and copy the LAN MAC address into the port_info structure has
been added. Note that the WoL MAC address is ignored currently as the WoL
feature isn't supported yet.

Fixes: dc49c77 ("ice: Get MAC/PHY/link info and scheduler topology")
Signed-off-by: Md Fahad Iqbal Polash <[email protected]>
Signed-off-by: Anirudh Venkataramanan <[email protected]>
Tested-by: Tony Brelinski <[email protected]>
Signed-off-by: Jeff Kirsher <[email protected]>

Author: Md Fahad Iqbal Polash

drivers/net/ethernet/intel/ice/ice_common.c

@@ -78,6 +78,7 @@ ice_aq_manage_mac_read(struct ice_hw *hw, void *buf, u16 buf_size,
 	struct ice_aq_desc desc;
 	enum ice_status status;
 	u16 flags;
+	u8 i;
 
 	cmd = &desc.params.mac_read;
 
@@ -98,8 +99,16 @@ ice_aq_manage_mac_read(struct ice_hw *hw, void *buf, u16 buf_size,
 		return ICE_ERR_CFG;
 	}
 
-	ether_addr_copy(hw->port_info->mac.lan_addr, resp->mac_addr);
-	ether_addr_copy(hw->port_info->mac.perm_addr, resp->mac_addr);
+	/* A single port can report up to two (LAN and WoL) addresses */
+	for (i = 0; i < cmd->num_addr; i++)
+		if (resp[i].addr_type == ICE_AQC_MAN_MAC_ADDR_TYPE_LAN) {
+			ether_addr_copy(hw->port_info->mac.lan_addr,
+					resp[i].mac_addr);
+			ether_addr_copy(hw->port_info->mac.perm_addr,
+					resp[i].mac_addr);
+			break;
+		}
+
 	return 0;
 }
 
@@ -464,9 +473,12 @@ enum ice_status ice_init_hw(struct ice_hw *hw)
 	if (status)
 		goto err_unroll_sched;
 
-	/* Get port MAC information */
-	mac_buf_len = sizeof(struct ice_aqc_manage_mac_read_resp);
-	mac_buf = devm_kzalloc(ice_hw_to_dev(hw), mac_buf_len, GFP_KERNEL);
+	/* Get MAC information */
+	/* A single port can report up to two (LAN and WoL) addresses */
+	mac_buf = devm_kcalloc(ice_hw_to_dev(hw), 2,
+			       sizeof(struct ice_aqc_manage_mac_read_resp),
+			       GFP_KERNEL);
+	mac_buf_len = 2 * sizeof(struct ice_aqc_manage_mac_read_resp);
 
 	if (!mac_buf) {
 		status = ICE_ERR_NO_MEMORY;