diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c
index 3626816b174ad7c53b0b40d4efa990c044d85204..f57fc217c46b77940257f86b43cdfa52590d6cb0 100644
--- a/fs/efivarfs/super.c
+++ b/fs/efivarfs/super.c
@@ -47,6 +47,10 @@ 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;