From bcef3fbc8ff86d7f072e0d552d1033e1f5ab9573 Mon Sep 17 00:00:00 2001
From: Shish <shish@shishnet.org>
Date: Mon, 29 Aug 2016 09:21:23 +0100
Subject: [PATCH] have tag sanitisation process ignore tags which are too long,
 fixes #565

---
 core/imageboard.pack.php | 5 +++++
 ext/tag_edit/test.php    | 7 +++++++
 2 files changed, 12 insertions(+)

diff --git a/core/imageboard.pack.php b/core/imageboard.pack.php
index b619f3d5..0827b411 100644
--- a/core/imageboard.pack.php
+++ b/core/imageboard.pack.php
@@ -1102,6 +1102,11 @@ class Tag {
 			$tag = preg_replace("/^(\.+[\/\\\\])+/", "", $tag);   # trailing slashes?
 			$tag = trim($tag, ", \t\n\r\0\x0B");
 
+			if(mb_strlen($tag, 'UTF-8') > 255){
+				flash_message("The tag below is longer than 255 characters, please use a shorter tag.\n$tag\n");
+				continue;
+			}
+
 			if(!empty($tag)) {
 				$tag_array[] = $tag;
 			}
diff --git a/ext/tag_edit/test.php b/ext/tag_edit/test.php
index 498d29f4..8099a702 100644
--- a/ext/tag_edit/test.php
+++ b/ext/tag_edit/test.php
@@ -21,6 +21,13 @@ class TagEditTest extends ShimmiePHPUnitTestCase {
 		$this->log_out();
 	}
 
+	public function testTagEdit_tooLong() {
+		$this->log_in_as_user();
+		$image_id = $this->post_image("tests/pbx_screenshot.jpg", str_repeat("a", 500));
+		$this->get_page("post/view/$image_id");
+		$this->assert_title("Image $image_id: tagme");
+	}
+
 	public function testSourceEdit() {
 		$this->log_in_as_user();
 		$image_id = $this->post_image("tests/pbx_screenshot.jpg", "pbx");