diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c
index d12a21b2dd9d..0f3d3d96599b 100644
--- a/fs/efivarfs/super.c
+++ b/fs/efivarfs/super.c
@@ -46,6 +46,10 @@ 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;