From 97535d7a15454fd10eab5bb1961537360f84a0a9 Mon Sep 17 00:00:00 2001
From: Javi Fontan <jfontan@gmail.com>
Date: Thu, 30 Sep 2021 11:47:56 +0200
Subject: [PATCH] Fix panic parsing list definition

---
 block.go         | 2 +-
 markdown_test.go | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/block.go b/block.go
index dcd61e6e..6712c027 100644
--- a/block.go
+++ b/block.go
@@ -1360,7 +1360,7 @@ gatherlines:
 			if *flags&ListTypeDefinition != 0 && i < len(data)-1 {
 				// is the next item still a part of this list?
 				next := i
-				for next < len(data) && data[next] != '\n' {
+				for next < len(data)-1 && data[next] != '\n' {
 					next++
 				}
 				for next < len(data)-1 && data[next] == '\n' {
diff --git a/markdown_test.go b/markdown_test.go
index 078dcda3..bed6e59c 100644
--- a/markdown_test.go
+++ b/markdown_test.go
@@ -34,6 +34,10 @@ func TestDocument(t *testing.T) {
 		// https://github.com/russross/blackfriday/issues/173
 		"   [",
 		"<p>[</p>\n",
+
+		// This should't panic.
+		"text\n\n:item: **text**\ntext\n",
+		"<dl>\n<dt>text</dt>\n</dl>\n\n<p>:item: <strong>text</strong>\ntext</p>\n",
 	}
 	doTests(t, tests)
 }