Reorder XML-RPC initialization in ipa-join to avoid segfault.

There were a number of code paths where we would try to call
xmlrpc_env_clean() without having first called xmlrpc_env_init()
Re-order the code so we always initialize the XML-RPC client first.

I also noticed a place where the return value of strdup() was not
being checked for NULL.

https://fedorahosted.org/freeipa/ticket/3275

1 files changed, 12 insertions, 7 deletions

diff --git a/ipa-client/ipa-join.c b/ipa-client/ipa-join.c
index 4c371131..64b4c0ac 100644
--- a/ipa-client/ipa-join.c
+++ b/ipa-client/ipa-join.c
@@ -735,6 +735,13 @@ unenroll_host(const char *server, const char *hostname, const char *ktname, int
     char * url = NULL;
     char * user_agent = NULL;
 
+    /* Start up our XML-RPC client library. */
+    xmlrpc_client_init(XMLRPC_CLIENT_NO_FLAGS, NAME, VERSION);
+
+    xmlrpc_env_init(&env);
+
+    xmlrpc_client_setup_global_const(&env);
+
     if (server) {
         ipaserver = strdup(server);
     } else {
@@ -755,6 +762,11 @@ unenroll_host(const char *server, const char *hostname, const char *ktname, int
         host = strdup(hostname);
     }
 
+    if (NULL == host) {
+        rval = 3;
+        goto cleanup;
+    }
+
     if (NULL == strstr(host, ".")) {
         if (!quiet)
             fprintf(stderr, _("The hostname must be fully-qualified: %s\n"),
@@ -846,13 +858,6 @@ unenroll_host(const char *server, const char *hostname, const char *ktname, int
     ccache = NULL;
     putenv("KRB5CCNAME=MEMORY:ipa-join");
 
-    /* Start up our XML-RPC client library. */
-    xmlrpc_client_init(XMLRPC_CLIENT_NO_FLAGS, NAME, VERSION);
-
-    xmlrpc_env_init(&env);
-
-    xmlrpc_client_setup_global_const(&env);
-
 #if 1
     ret = asprintf(&url, "https://%s:443/ipa/xml", ipaserver);
 #else