From a56d5b396b7fbdae140440314a3bf6f9bba2ab65 Mon Sep 17 00:00:00 2001
From: Francesco <inbox@francescorocca.me>
Date: Mon, 16 Mar 2026 23:10:36 +0100
Subject: [PATCH] refactor(stack): add missing mtx unlock

---
 stack/mystack.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/stack/mystack.c b/stack/mystack.c
index 6241d2e..8db7774 100644
--- a/stack/mystack.c
+++ b/stack/mystack.c
@@ -21,6 +21,7 @@ stack_s *stack_new(size_t initial_capacity, size_t element_size) {
 	/* Allocate the vec data */
 	stack->data = vec_new(initial_capacity, element_size);
 	if (stack->data == NULL) {
+		mtx_destroy(&stack->lock);
 		free(stack);
 		return NULL;
 	}
@@ -71,7 +72,14 @@ void *stack_top(stack_s *stack) {
 		return NULL;
 	}
 
-	void *elem = vec_get(stack->data, stack->data->size - 1);
+	size_t size = vec_size(stack->data);
+	if (size == 0) {
+		mtx_unlock(&stack->lock);
+
+		return NULL;
+	}
+
+	void *elem = vec_get(stack->data, size - 1);
 
 	mtx_unlock(&stack->lock);
 
@@ -84,5 +92,6 @@ void stack_free(stack_s *stack) {
 	}
 
 	vec_free(stack->data);
+	mtx_destroy(&stack->lock);
 	free(stack);
 }