fix: add null check in rmdir/unlinkat

close: #I4ATUC
Signed-off-by: NLeon Chan <chenwei26@huawei.com>

fs/vfs/fs_rmdir.c

@@ -111,6 +111,11 @@ int do_rmdir(int dirfd, const char *pathname)
   char             *name         = NULL;
   int               ret;
 
+  if (pathname == NULL)
+    {
+      return -EINVAL;
+    }
+
   /* Get relative path by dirfd*/
   ret = get_path_from_fd(dirfd, &relativepath);
   if (ret < 0)

fs/vfs/fs_unlink.c

@@ -192,9 +192,13 @@ extern int do_rmdir(int dirfd, const char *pathname);
 
 int unlinkat(int dirfd, const char *pathname, int flag)
 {
+  if (pathname == NULL)
+  {
+    return -EINVAL;
+  }
   /* Now flag only support 0 && AT_REMOVEDIR */
   if ((flag & ~AT_REMOVEDIR) != 0)
-    return VFS_ERROR;
+    return -EINVAL;
 
   if (flag & AT_REMOVEDIR)
     return do_rmdir(dirfd, pathname);