From 28ce1b04ef2b818ccc64df656865ec20af2f35fc Mon Sep 17 00:00:00 2001
From: Niels Dossche <7771979+nielsdos@users.noreply.github.com>
Date: Fri, 17 Oct 2025 22:54:04 +0200
Subject: [PATCH] intl: Fix memory leak on error in locale_filter_matches()

Closes GH-20207.
---
 NEWS                             | 3 +++
 ext/intl/locale/locale_methods.c | 1 +
 2 files changed, 4 insertions(+)

diff --git a/NEWS b/NEWS
index 057d26c7d52e3..96dd99d8da89b 100644
--- a/NEWS
+++ b/NEWS
@@ -23,6 +23,9 @@ PHP                                                                        NEWS
   . Fixed bug GH-20070 (Return type violation in imagefilter when an invalid
     filter is provided). (Girgias)
 
+- Intl:
+  . Fix memory leak on error in locale_filter_matches(). (nielsdos)
+
 - LibXML:
   . Fix not thread safe schema/relaxng calls. (SpencerMalone, nielsdos)
 
diff --git a/ext/intl/locale/locale_methods.c b/ext/intl/locale/locale_methods.c
index 44ae9a901a56e..cc6437625e509 100644
--- a/ext/intl/locale/locale_methods.c
+++ b/ext/intl/locale/locale_methods.c
@@ -1301,6 +1301,7 @@ PHP_FUNCTION(locale_filter_matches)
 		/* canonicalize lang_tag */
 		can_lang_tag = get_icu_value_internal( lang_tag , LOC_CANONICALIZE_TAG , &result ,  0);
 		if( result <=0) {
+			zend_string_release_ex( can_loc_range, false );
 			intl_error_set( NULL, status,
 				"locale_filter_matches : unable to canonicalize lang_tag" , 0 );
 			RETURN_FALSE;