fix memleak due to missing pthread_attr_destroy()-call

Closes GH-14510

NEWS

@@ -10,6 +10,8 @@ PHP                                                                        NEWS
     values during Generator->throw()). (Bob)
   . Fixed bug GH-14456 (Attempting to initialize class with private constructor
     calls destructor). (Girgias)
+  . Fixed bug GH-14510 (memleak due to missing pthread_attr_destroy()-call).
+    (Florian Engelhardt)
 
 - BCMatch:
   . Fixed bug (bcpowmod() with mod = -1 returns 1 when it must be 0). (Girgias)

Zend/zend_call_stack.c

@@ -124,6 +124,7 @@ static bool zend_call_stack_get_linux_pthread(zend_call_stack *stack)
 
 	error = pthread_attr_getstack(&attr, &addr, &max_size);
 	if (error) {
+		pthread_attr_destroy(&attr);
 		return false;
 	}
 
@@ -133,6 +134,7 @@ static bool zend_call_stack_get_linux_pthread(zend_call_stack *stack)
 		/* In glibc prior to 2.8, addr and size include the guard pages */
 		error = pthread_attr_getguardsize(&attr, &guard_size);
 		if (error) {
+			pthread_attr_destroy(&attr);
 			return false;
 		}
 
@@ -144,6 +146,8 @@ static bool zend_call_stack_get_linux_pthread(zend_call_stack *stack)
 	stack->base = (int8_t*)addr + max_size;
 	stack->max_size = max_size;
 
+	pthread_attr_destroy(&attr);
+
 	return true;
 }
 # else /* defined(HAVE_PTHREAD_GETATTR_NP) && defined(HAVE_PTHREAD_ATTR_GETSTACK) */