krb5 commit: Add duplicate check to kadm5_create_policy()

https://github.com/krb5/krb5/commit/311f433cba0dba5cd88a837c0369295bc43d305e
commit 311f433cba0dba5cd88a837c0369295bc43d305e
Author: Greg Hudson <[email protected]>
Date:   Fri Apr 16 02:25:21 2021 -0400

    Add duplicate check to kadm5_create_policy()
    
    For symmetry with kadm5_create_principal_3(), check for an existing
    policy in kadm5_create_policy() and return KADM5_DUP if one is found.
    
    ticket: 9003 (new)

 src/lib/kadm5/srv/svr_policy.c |   10 +++++++++-
 1 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/src/lib/kadm5/srv/svr_policy.c b/src/lib/kadm5/srv/svr_policy.c
index d7940ef..9569e24 100644
--- a/src/lib/kadm5/srv/svr_policy.c
+++ b/src/lib/kadm5/srv/svr_policy.c
@@ -59,7 +59,7 @@ kadm5_ret_t
 kadm5_create_policy(void *server_handle, kadm5_policy_ent_t entry, long mask)
 {
     kadm5_server_handle_t handle = server_handle;
-    osa_policy_ent_rec  pent;
+    osa_policy_ent_rec  pent, *check_pol;
     int                 ret;
     char                *p;
 
@@ -80,6 +80,14 @@ kadm5_create_policy(void *server_handle, kadm5_policy_ent_t entry, long mask)
             return ret;
     }
 
+    ret = krb5_db_get_policy(handle->context, entry->policy, &check_pol);
+    if (!ret) {
+        krb5_db_free_policy(handle->context, check_pol);
+        return KADM5_DUP;
+    } else if (ret != KRB5_KDB_NOENTRY) {
+        return ret;
+    }
+
     memset(&pent, 0, sizeof(pent));
     pent.name = entry->policy;
     p = entry->policy;