diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c
index 586c5709dfb554e9ed0808170367ee94fe6e0304..34438981ddd805a8612bc6beabdb12c583f6cb67 100644
--- a/fs/efivarfs/super.c
+++ b/fs/efivarfs/super.c
@@ -90,6 +90,10 @@ static int efivarfs_d_compare(const struct dentry *dentry,
 {
 	int guid = len - EFI_VARIABLE_GUID_LEN;
 
+	/* Parallel lookups may produce a temporary invalid filename */
+	if (guid <= 0)
+		return 1;
+
 	if (name->len != len)
 		return 1;