ice: Fix possible NULL pointer de-reference

[ Upstream commit f25dad19 ]

A recent update to smatch is causing it to report the error "we previously
assumed 'm_entry->vsi_list_info' could be null". Fix that.
Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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

@@ -1023,6 +1023,9 @@ ice_handle_vsi_list_mgmt(struct ice_hw *hw,
 		u16 vsi_id = new_fltr->fwd_id.vsi_id;
 		enum ice_adminq_opc opcode;
 
+		if (!m_entry->vsi_list_info)
+			return ICE_ERR_CFG;
+
 		/* A rule already exists with the new VSI being added */
 		if (test_bit(vsi_id, m_entry->vsi_list_info->vsi_map))
 			return 0;