Stop link parsing when second `<` is found

`[](<foo<bar>)` is no longer a valid link

CHANGELOG.md

@@ -6,6 +6,11 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 
+## [12.0.3] - WIP
+### Fixed
+- `[](<foo<bar>)` is no longer a valid link.
+
+
 ## [12.0.2] - 2020-10-23
 ### Fixed
 - Three pipes (`|\n|\n|`) are no longer rendered as a table with no columns, #724.
@@ -534,6 +539,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Renamed presets folder (configs -> presets).
 
 
+[12.0.3]: https://github.com/markdown-it/markdown-it/compare/12.0.2...12.0.3
 [12.0.2]: https://github.com/markdown-it/markdown-it/compare/12.0.1...12.0.2
 [12.0.1]: https://github.com/markdown-it/markdown-it/compare/12.0.0...12.0.1
 [12.0.0]: https://github.com/markdown-it/markdown-it/compare/11.0.1...12.0.0

lib/helpers/parse_link_destination.js

@@ -22,6 +22,7 @@ module.exports = function parseLinkDestination(str, pos, max) {
     while (pos < max) {
       code = str.charCodeAt(pos);
       if (code === 0x0A /* \n */) { return result; }
+      if (code === 0x3C /* < */) { return result; }
       if (code === 0x3E /* > */) {
         result.pos = pos + 1;
         result.str = unescapeAll(str.slice(start + 1, pos));

test/fixtures/markdown-it/commonmark_extras.txt

@@ -255,6 +255,18 @@ List item terminating quote should not be paragraph continuation
 </ol>
 .
 
+
+Link destination cannot contain '<'
+.
+[](<foo<bar>)
+
+[](<foo\<bar>)
+.
+<p>[](&lt;foo<bar>)</p>
+<p><a href="foo%3Cbar"></a></p>
+.
+
+
 Coverage. Directive can terminate paragraph.
 .
 a