From 37afae0787ab76c99da1a08d52fdd4f5bdc694e4 Mon Sep 17 00:00:00 2001
From: Niels Dossche <7771979+nielsdos@users.noreply.github.com>
Date: Sun, 20 Apr 2025 22:57:58 +0200
Subject: [PATCH] Fix GH-17403: Potential deadlock when putenv fails

---
 ext/standard/basic_functions.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ext/standard/basic_functions.c b/ext/standard/basic_functions.c
index 99d92af167f0e..d2a99fccc95fe 100644
--- a/ext/standard/basic_functions.c
+++ b/ext/standard/basic_functions.c
@@ -849,6 +849,7 @@ PHP_FUNCTION(putenv)
 #endif
 		RETURN_TRUE;
 	} else {
+		tsrm_env_unlock();
 		free(pe.putenv_string);
 		zend_string_release(pe.key);
 #ifdef PHP_WIN32