diff --git a/security/keys/encrypted-keys/encrypted.c b/security/keys/encrypted-keys/encrypted.c
index 220c2cf7bd42..45d5c5926d03 100644
--- a/security/keys/encrypted-keys/encrypted.c
+++ b/security/keys/encrypted-keys/encrypted.c
@@ -847,7 +847,7 @@ static int encrypted_update(struct key *key, struct key_preparsed_payload *prep)
 
 	if (test_bit(KEY_FLAG_NEGATIVE, &key->flags))
 		return -ENOKEY;
-	if (datalen <= 0 || datalen > 32767 || !data)
+	if (datalen <= 0 || datalen > 32767 || !prep->data)
 		return -EINVAL;
 
 	buf = kmalloc(datalen + 1, GFP_KERNEL);