Changeset 41496

Timestamp:

09/19/2017 05:55:33 PM (7 years ago)

Author:

aaroncampbell

Message:

Database: Hardening to bring wpdb::prepare() inline with documentation.

wpdb::prepare() supports %s, %d, and %F as placeholders in the query string. Any other non-escaped % will be escaped.

Location:

trunk

Files:

• src/wp-includes/wp-db.php (modified) (2 diffs)
• tests/phpunit/tests/db.php (modified) (2 diffs)

trunk/src/wp-includes/wp-db.php

@@ -1253 +1253 @@
         $query = preg_replace( '|(?<!%)%f|' , '%F', $query ); // Force floats to be locale unaware
         $query = preg_replace( '|(?<!%)%s|', "'%s'", $query ); // quote the strings, avoiding escaped strings like %%s
+        $query = preg_replace( '/%(?:%|$|([^dsF]))/', '%%\\1', $query ); // escape any unescaped percents 
         array_walk( $args, array( $this, 'escape_by_ref' ) );
         return @vsprintf( $query, $args );
@@ -2822 +2823 @@
 
                     if ( is_array( $value['length'] ) ) {
-                        $queries[ $col ] = $this->prepare( "CONVERT( LEFT( CONVERT( %s USING $charset ), %.0f ) USING $connection_charset )", $value['value'], $value['length']['length'] );
+                        $length = sprintf( '%.0f', $value['length']['length'] );
+                        $queries[ $col ] = $this->prepare( "CONVERT( LEFT( CONVERT( %s USING $charset ), $length ) USING $connection_charset )", $value['value'] );
                     } else if ( 'binary' !== $charset ) {
                         // If we don't have a length, there's no need to convert binary - it will always return the same result.

trunk/tests/phpunit/tests/db.php

@@ -274 +274 @@
     }
 
+
     /**
      * Test that SQL modes are set correctly
@@ -1116 +1117 @@
         $this->assertSame( 'utf8_general_ci', $result['collate'] );
     }
+
+    /**
+     *
+     */
+    function test_prepare_with_unescaped_percents() {
+        global $wpdb;
+
+        $sql = $wpdb->prepare( '%d %1$d %%% %', 1 );
+        $this->assertEquals( '1 %1$d %% %', $sql );
+    }
 }