diff --git a/common/password.c b/common/password.c
index 0cb79b8..43c5e0c 100644
--- a/common/password.c
+++ b/common/password.c
@@ -288,6 +288,10 @@
 		hash_len = PBKDF2_LENGTH;
 	} else {
 		d = digest_alloc(PASSWD_SUM);
+		if (!d) {
+			pr_err("No such digest: %s\n", PASSWD_SUM);
+			return -ENOENT;
+		}
 
 		hash_len = digest_length(d);
 	}