https://bugzilla.wikimedia.org/show_bug.cgi?id=59124

Bryan Davis <bda...@wikimedia.org> changed:

           What    |Removed                     |Added
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                 CC|                            |bda...@wikimedia.org

--- Comment #2 from Bryan Davis <bda...@wikimedia.org> ---
Within Linker::formatComment, the $comment parameter that is ultimately
returned passes through three different method calls that utilize
preg_replace_callback:

* Sanitizer::escapeHtmlAllowEntities
* Linker::formatAutocomments
* Linker::formatLinksInComment

preg_replace_callback is documented to return null on error in in no case is
the return value checked.

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