From fc42ff0212430274fd0001a492024510822a73a2 Mon Sep 17 00:00:00 2001
From: Nicolas Williams <nico@twosigma.com>
Date: Mon, 17 Jan 2022 11:16:07 -0600
Subject: [PATCH] krb5: Fix NULL-deref in send_to_kdc

Coverity thinks `handle` in lib/krb5/send_to_kdc.c:krb5_sendto_context()
at 1241 can be NULL, leading to a NULL derefence in `get_next()`.  This
is an attempt to fix this by having `get_next()` check handle for NULL.
---
 lib/krb5/krbhst.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/krb5/krbhst.c b/lib/krb5/krbhst.c
index 9f0313f9a..925937a08 100644
--- a/lib/krb5/krbhst.c
+++ b/lib/krb5/krbhst.c
@@ -438,7 +438,7 @@ krb5_krbhst_get_addrinfo(krb5_context context, krb5_krbhst_info *host,
 static krb5_boolean
 get_next(struct krb5_krbhst_data *kd, krb5_krbhst_info **host)
 {
-    struct krb5_krbhst_info *hi = *kd->index;
+    struct krb5_krbhst_info *hi = kd ? *kd->index : NULL;
     if(hi != NULL) {
 	*host = hi;
 	kd->index = &(*kd->index)->next;