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<title>[51107] trunk/src/wp-includes: Widgets: Prevent infinite loop in PHP8+ if the URL for the widget instance is incorrectly defined</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/51107">51107</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/51107","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>jorbin</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2021-06-08 19:34:28 +0000 (Tue, 08 Jun 2021)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Widgets: Prevent infinite loop in PHP8+ if the URL for the widget instance is incorrectly defined
This checks to make sure $link isn't empty before attempting to manipulate it. A simple test to demonstrate this can be seen at https://3v4l.org/PgSZg. Unit tests for both what already works and what is fixed by this change.
Props hellofromTonya, dd32, peterwilsoncc.
Fixes <a href="https://core.trac.wordpress.org/ticket/53278">#53278</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludeswidgetsclasswpwidgetrssphp">trunk/src/wp-includes/widgets/class-wp-widget-rss.php</a></li>
<li><a href="#trunksrcwpincludeswidgetsphp">trunk/src/wp-includes/widgets.php</a></li>
</ul>
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<h3>Diff</h3>
<a id="trunksrcwpincludeswidgetsclasswpwidgetrssphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/widgets/class-wp-widget-rss.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/widgets/class-wp-widget-rss.php 2021-06-08 18:52:55 UTC (rev 51106)
+++ trunk/src/wp-includes/widgets/class-wp-widget-rss.php 2021-06-08 19:34:28 UTC (rev 51107)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -50,7 +50,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> $url = ! empty( $instance['url'] ) ? $instance['url'] : '';
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- while ( stristr( $url, 'http' ) !== $url ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ while ( ! empty( $url ) && stristr( $url, 'http' ) !== $url ) {
</ins><span class="cx" style="display: block; padding: 0 10px"> $url = substr( $url, 1 );
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -74,7 +74,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> $title = strip_tags( $rss->get_title() );
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> $link = strip_tags( $rss->get_permalink() );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- while ( stristr( $link, 'http' ) !== $link ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ while ( ! empty( $link ) && stristr( $link, 'http' ) !== $link ) {
</ins><span class="cx" style="display: block; padding: 0 10px"> $link = substr( $link, 1 );
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span></span></pre></div>
<a id="trunksrcwpincludeswidgetsphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/widgets.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/widgets.php 2021-06-08 18:52:55 UTC (rev 51106)
+++ trunk/src/wp-includes/widgets.php 2021-06-08 19:34:28 UTC (rev 51107)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1565,7 +1565,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> echo '<ul>';
</span><span class="cx" style="display: block; padding: 0 10px"> foreach ( $rss->get_items( 0, $items ) as $item ) {
</span><span class="cx" style="display: block; padding: 0 10px"> $link = $item->get_link();
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- while ( stristr( $link, 'http' ) !== $link ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ while ( ! empty( $link ) && stristr( $link, 'http' ) !== $link ) {
</ins><span class="cx" style="display: block; padding: 0 10px"> $link = substr( $link, 1 );
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> $link = esc_url( strip_tags( $link ) );
</span></span></pre>
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