Restrict page number passed to view.

Limit the page number to the max page number when passing data to the
view.  This prevents the helper from generating a huge number of links.

Fixes #2929

lib/Cake/Controller/Component/PaginatorComponent.php

@@ -184,6 +184,7 @@ public function paginate($object = null, $scope = array(), $whitelist = array())
 			$count = $object->find('count', array_merge($parameters, $extra));
 		}
 		$pageCount = intval(ceil($count / $limit));
+		$page = min($page, $pageCount);
 
 		$paging = array(
 			'page' => $page,

lib/Cake/Test/Case/Controller/Component/PaginatorComponentTest.php

@@ -713,6 +713,21 @@ public function testValidateSortInvalidDirection() {
 		$this->assertEquals('asc', $result['order']['model.something']);
 	}
 
+/**
+ * Test that a really large page number gets clamped to the max page size.
+ */
+	public function testOutOfRangePageNumberGetsClamped() {
+		$Controller = new PaginatorTestController($this->request);
+		$Controller->uses = array('PaginatorControllerPost');
+		$Controller->params['named'] = array(
+			'page' => 3000,
+		);
+		$Controller->constructClasses();
+		$Controller->PaginatorControllerPost->recursive = 0;
+		$Controller->Paginator->paginate('PaginatorControllerPost');
+		$this->assertEquals(1, $Controller->request->params['paging']['PaginatorControllerPost']['page']);
+	}
+
 /**
  * test that fields not in whitelist won't be part of order conditions.
  *