From 306e4cbead22e2bb12f699d0072eb8d5b1bc6733 Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <tridge@samba.org>
Date: Wed, 23 Oct 2002 00:02:26 +0000
Subject: [PATCH] fixed a possible segv when dealing with a blank password
 (This used to be commit d5d0d0de50482ed16c594b1cc4cc113e2526a915)

---
 source3/libads/kerberos.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/source3/libads/kerberos.c b/source3/libads/kerberos.c
index b586d842262..bef2febaefd 100644
--- a/source3/libads/kerberos.c
+++ b/source3/libads/kerberos.c
@@ -40,8 +40,12 @@ kerb_prompter(krb5_context ctx, void *data,
 
 	memset(prompts[0].reply->data, 0, prompts[0].reply->length);
 	if (prompts[0].reply->length > 0) {
-		strncpy(prompts[0].reply->data, data, prompts[0].reply->length-1);
-		prompts[0].reply->length = strlen(prompts[0].reply->data);
+		if (data) {
+			strncpy(prompts[0].reply->data, data, prompts[0].reply->length-1);
+			prompts[0].reply->length = strlen(prompts[0].reply->data);
+		} else {
+			prompts[0].reply->length = 0;
+		}
 	}
 	return 0;
 }
-- 
2.34.1