fix null pointer dereference errors

Change-Id: I82a849afe9f432a1084ad2505ce88b1fe4d3d3af

kadmin/rpc.c

@@ -758,6 +758,16 @@ process_stream(krb5_context contextp,
     reply = krb5_storage_emem();
     dreply = krb5_storage_emem();
 
+    if (msg == NULL || reply == NULL || dreply == NULL) {
+	if (msg != NULL)
+	    krb5_storage_free(mem);
+	if (reply != NULL)
+	    krb5_storage_free(reply);
+	if (dreply != NULL)
+	    krb5_storage_free(dreply);
+	return krb5_enomem(contextp);
+    }
+
     /*
      * First packet comes partly from the caller
      */

lib/gssapi/mech/gss_export_sec_context.c

@@ -34,8 +34,8 @@ gss_export_sec_context(OM_uint32 *minor_status,
     gss_buffer_t interprocess_token)
 {
 	OM_uint32 major_status;
-	struct _gss_context *ctx = (struct _gss_context *) *context_handle;
+	struct _gss_context *ctx;
-	gssapi_mech_interface m = ctx->gc_mech;
+	gssapi_mech_interface m;
 	gss_buffer_desc buf;
 
 	*minor_status = 0;

lib/kadm5/log.c

@@ -1688,6 +1688,9 @@ kadm5_log_nop(kadm5_server_context *context, enum kadm_nop_type nop_type)
         return errno;
 
     sp = krb5_storage_emem();
+    if (sp == NULL)
+	return krb5_enomem(context->context);
+
     ret = kadm5_log_preamble(context, sp, kadm_nop, off == 0 ? 0 : vno + 1);
     if (ret)
         goto out;

lib/kadm5/marshall.c

@@ -380,6 +380,8 @@ _kadm5_marshal_params(krb5_context context,
 		      krb5_data *out)
 {
     krb5_storage *sp = krb5_storage_emem();
+    if (sp == NULL)
+	return krb5_enomem(context);
 
     krb5_store_int32(sp, params->mask & (KADM5_CONFIG_REALM));
 

lib/krb5/fcache.c

@@ -541,6 +541,8 @@ fcc_initialize(krb5_context context,
     {
 	krb5_storage *sp;
 	sp = krb5_storage_emem();
+	if (sp == NULL)
+	    return krb5_enomem(context);
 	krb5_storage_set_eof_code(sp, KRB5_CC_END);
 	if(context->fcache_vno != 0)
 	    f->version = context->fcache_vno;
@@ -625,6 +627,8 @@ fcc_store_cred(krb5_context context,
 	krb5_storage *sp;
 
 	sp = krb5_storage_emem();
+	if (sp == NULL)
+	    return krb5_enomem(context);
 	krb5_storage_set_eof_code(sp, KRB5_CC_END);
 	storage_set_flags(context, sp, FCACHE(id)->version);
 	ret = krb5_store_creds(sp, creds);