[libvirt] [PATCH] util.c (virGetUserEnt): don't use a negative value as allocation size

[Jim Meyering <jim@xxxxxxxxxxxx>]

Not a big deal, but reporting a failed sysconf call will make
this far easier to diagnose than reporting an unwarranted OOM.

>From 2bf48c9414cac791f03228ff15590414ec617f22 Mon Sep 17 00:00:00 2001
From: Jim Meyering <meyering@xxxxxxxxxx>
Date: Thu, 28 Jan 2010 13:37:05 +0100
Subject: [PATCH] util.c (virGetUserEnt): don't use a negative value as allocation size

* src/util/util.c (virGetUserEnt): In the unlikely event that
sysconf(_SC_GETPW_R_SIZE_MAX) fails, don't use -1 as the size in
the subsequent allocation.
---
 src/util/util.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/src/util/util.c b/src/util/util.c
index 0ce5026..701581d 100644
--- a/src/util/util.c
+++ b/src/util/util.c
@@ -2317,7 +2317,13 @@ static char *virGetUserEnt(virConnectPtr conn,
     char *ret;
     struct passwd pwbuf;
     struct passwd *pw = NULL;
-    size_t strbuflen = sysconf(_SC_GETPW_R_SIZE_MAX);
+    long val = sysconf(_SC_GETPW_R_SIZE_MAX);
+    size_t strbuflen = val;
+
+    if (val < 0) {
+        virReportSystemError(conn, errno, "%s", _("sysconf failed"));
+        return NULL;
+    }

     if (VIR_ALLOC_N(strbuf, strbuflen) < 0) {
         virReportOOMError(conn);
--
1.7.0.rc0.170.g7207c

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