From: Eric Blake <eblake@redhat.com>
Date: Wed, 2 Jun 2010 15:03:57 +0000 (-0600)
Subject: bitmap: reject zero-size bitmap
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=ce49cfb48ad5e9cac79819d0ccde4394c237af25;p=libvirt.git

bitmap: reject zero-size bitmap

* src/util/bitmap.c (virBitmapAlloc): Tighten sanity check.
---

diff --git a/src/util/bitmap.c b/src/util/bitmap.c
index 69094a5ffc..44edb4934e 100644
--- a/src/util/bitmap.c
+++ b/src/util/bitmap.c
@@ -1,6 +1,7 @@
 /*
  * bitmap.h: Simple bitmap operations
  *
+ * Copyright (C) 2010 Red Hat, Inc.
  * Copyright (C) 2010 Novell, Inc.
  *
  * This library is free software; you can redistribute it and/or
@@ -58,7 +59,7 @@ virBitmapPtr virBitmapAlloc(size_t size)
     virBitmapPtr bitmap;
     size_t sz;
 
-    if (SIZE_MAX - VIR_BITMAP_BITS_PER_UNIT < size)
+    if (SIZE_MAX - VIR_BITMAP_BITS_PER_UNIT < size || size == 0)
         return NULL;
 
     sz = (size + VIR_BITMAP_BITS_PER_UNIT - 1) /