Unchecked return value in ipa-getkeytab

krb5_init_context return value was not checked. This could lead
to unhandled error issues.

This patch moves the Kerberos context initialization to the
branch where it is needed and handles the error value in a way
that allows program exit in a standard way deallocating all
resources.

https://fedorahosted.org/freeipa/ticket/721

1 files changed, 15 insertions, 3 deletions

diff --git a/ipa-client/ipa-getkeytab.c b/ipa-client/ipa-getkeytab.c
index 8f108de4a..e4c7b0e2b 100644
--- a/ipa-client/ipa-getkeytab.c
+++ b/ipa-client/ipa-getkeytab.c
@@ -76,18 +76,31 @@ static int ldap_sasl_interact(LDAP *ld, unsigned flags, void *priv_data, void *s
 	krb5_principal princ = (krb5_principal)priv_data;
 	krb5_context krbctx;
 	char *outname = NULL;
+	krb5_error_code krberr;
 
 	if (!ld) return LDAP_PARAM_ERROR;
 
-	krb5_init_context(&krbctx);
-
 	for (in = sit; in && in->id != SASL_CB_LIST_END; in++) {
 		switch(in->id) {
 		case SASL_CB_USER:
+			krberr = krb5_init_context(&krbctx);
+
+			if (krberr) {
+				fprintf(stderr, _("Kerberos context initialization failed\n"));
+				in->result = NULL;
+				in->len = 0;
+				ret = LDAP_LOCAL_ERROR;
+				break;
+			}
+
 			krb5_unparse_name(krbctx, princ, &outname);
+
 			in->result = outname;
 			in->len = strlen(outname);
 			ret = LDAP_SUCCESS;
+
+			krb5_free_context(krbctx);
+
 			break;
 		case SASL_CB_GETREALM:
 			in->result = princ->realm.data;
@@ -100,7 +113,6 @@ static int ldap_sasl_interact(LDAP *ld, unsigned flags, void *priv_data, void *s
 			ret = LDAP_OTHER;
 		}
 	}
-	krb5_free_context(krbctx);
 	return ret;
 }