[libvirt] [PATCH] interface_conf.c: don't use a negative value as allocation size

[Jim Meyering]

Here's one way to solve this.
Another would be to change the way virXPathNodeSet works, but
there are several other uses of it.

>From 75108240911a1ad943e0bde8ba9ade92ea216f60 Mon Sep 17 00:00:00 2001
From: Jim Meyering <meyering at redhat.com>
Date: Tue, 2 Feb 2010 20:54:01 +0100
Subject: [PATCH] interface_conf.c: don't use a negative value as allocation size

* src/conf/interface_conf.c (virInterfaceDefParseProtoIPv4): If
virXPathNodeSet returns -1, indicate failure by returning -1 right away.
(virInterfaceDefParseProtoIPv6): Likewise.
---
 src/conf/interface_conf.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/src/conf/interface_conf.c b/src/conf/interface_conf.c
index 8a17ed6..510df81 100644
--- a/src/conf/interface_conf.c
+++ b/src/conf/interface_conf.c
@@ -1,9 +1,9 @@
 /*
  * interface_conf.c: interfaces XML handling
  *
- * Copyright (C) 2006-2009 Red Hat, Inc.
+ * Copyright (C) 2006-2010 Red Hat, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
@@ -318,10 +318,12 @@ virInterfaceDefParseProtoIPv4(virConnectPtr conn, virInterfaceProtocolDefPtr def
         if (ret != 0)
            return(ret);
     }

     nIpNodes = virXPathNodeSet(conn, "./ip", ctxt, &ipNodes);
+    if (nIpNodes < 0)
+        return -1;
     if (ipNodes == NULL)
         return 0;

     if (VIR_ALLOC_N(def->ips, nIpNodes) < 0) {
         virReportOOMError(conn);
@@ -375,10 +377,12 @@ virInterfaceDefParseProtoIPv6(virConnectPtr conn, virInterfaceProtocolDefPtr def
         if (ret != 0)
            return(ret);
     }

     nIpNodes = virXPathNodeSet(conn, "./ip", ctxt, &ipNodes);
+    if (nIpNodes < 0)
+        return -1;
     if (ipNodes == NULL)
         return 0;

     if (VIR_ALLOC_N(def->ips, nIpNodes) < 0) {
         virReportOOMError(conn);
--
1.7.0.rc1.167.gdb08