diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c
index 834615f13f3e32f5f79498a109949ff77d301741..d79ca59370b6afe5553160a752d7a83483ef04a0 100644
--- a/fs/efivarfs/super.c
+++ b/fs/efivarfs/super.c
@@ -50,6 +50,10 @@ 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;