diff --git a/check_failure.sh b/check_failure.sh
new file mode 100755
index 0000000..f7e0411
--- /dev/null
+++ b/check_failure.sh
@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+
+set -xuo pipefail
+
+for FAIL_AFTER in `seq 1 1000`
+do
+	cc -ggdb -Wall -Wextra -Werror -D FAIL_AFTER=$FAIL_AFTER *.c
+	valgrind -q --leak-check=full ./a.out get_next_line.c
+done
diff --git a/get_next_line.c b/get_next_line.c
index 85fac13..eab5155 100644
--- a/get_next_line.c
+++ b/get_next_line.c
@@ -6,13 +6,28 @@
 /*   By: kcolin <marvin@42.fr>                      +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/10/23 20:32:46 by kcolin            #+#    #+#             */
-/*   Updated: 2024/10/31 17:30:56 by kcolin           ###   ########.fr       */
+/*   Updated: 2024/11/01 12:14:49 by kcolin           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #include "get_next_line.h"
 #include <stdlib.h>
 
+/*
+static int num_allocs = 0;
+
+static void *xmalloc(size_t size)
+{
+    if (FAIL_AFTER > 0 && num_allocs++ >= FAIL_AFTER)
+    {
+        return 0;
+    }
+    return malloc(size);
+}
+
+#define malloc(x) xmalloc(x)
+*/
+
 char	*ft_strchr(const char *s, int c)
 {
 	size_t	i;
@@ -92,7 +107,10 @@ char	*ft_strjoin_free_s1(char const *s1, char const *s2)
 	len = ft_strlen(s1) + ft_strlen(s2) + 1;
 	out = malloc(len);
 	if (out == NULL)
+	{
+		free((void *)s1);
 		return (NULL);
+	}
 	ft_strlcpy(out, s1, len);
 	ft_strlcat(out, s2, len);
 	free((void *)s1);
@@ -149,7 +167,10 @@ char	*get_next_line(int fd)
 	}
 	read_buffer = malloc((BUFFER_SIZE + 1) * sizeof(char));
 	if (read_buffer == NULL)
+	{
+		free(buffer);
 		return (NULL);
+	}
 	num_bytes_read = 1;
 	while (num_bytes_read != 0)
 	{