Validate video and audio metadata.

Merge of [40148] to the 4.1 branch.

Built from https://develop.svn.wordpress.org/branches/4.1@40155


git-svn-id: http://core.svn.wordpress.org/branches/4.1@40094 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/media.php

@@ -2977,6 +2977,8 @@ function wp_read_video_metadata( $file ) {
 
 	wp_add_id3_tag_data( $metadata, $data );
 
+	$metadata = wp_kses_post_deep( $metadata );
+
 	return $metadata;
 }
 
@@ -3016,5 +3018,7 @@ function wp_read_audio_metadata( $file ) {
 
 	wp_add_id3_tag_data( $metadata, $data );
 
+	$metadata = wp_kses_post_deep( $metadata );
+
 	return $metadata;
 }