Fix malloc check

src/exec.c

@@ -171,9 +171,9 @@ int execute(char *buffer, env_t *env, history_t *history)
             return BUILTINS[i].ptr(env, args, buffer);
     path = get_env_value(env, "PATH");
     full_bin_path = find_binary(path, args[0]);
-    U_DEBUG("Found bin [%s]\n", full_bin_path);
     if (full_bin_path == NULL)
         return (free((void *)args), RETURN_FAILURE);
+    U_DEBUG("Found bin [%s]\n", full_bin_path);
     status = launch_bin(full_bin_path, args, env, buffer);
     status_handler(status, history);
     free(full_bin_path);

ulib/mem/realloc.c

@@ -19,6 +19,8 @@ void *u_realloc(void *ptr, size_t actual_size, size_t new_size)
     if (!actual_size && !new_size)
         return NULL;
     new = malloc(new_size);
+    if (new == NULL)
+        return NULL;
     if (actual_size > 0 && new_size > 0)
         u_memcpy(new, ptr, actual_size);
     free(ptr);

ulib/str/strdup.c

@@ -16,6 +16,8 @@ char *u_strdup(char const *src)
     int len = u_strlen(src);
 
     dest = malloc(sizeof(char) * (len + 1));
+    if (dest == NULL)
+        return NULL;
     u_bzero(dest, len + 1);
     return u_strcpy(dest, src);
 }