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bitmap: reject zero-size bitmap

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* src/util/bitmap.c (virBitmapAlloc): Tighten sanity check.
This commit is contained in:
Eric Blake 2010-06-02 09:03:57 -06:00
parent fa6da6608a
commit ce49cfb48a
1 changed files with 2 additions and 1 deletions
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3
src/util/bitmap.c
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@ -1,6 +1,7 @@
/* /*
* bitmap.h: Simple bitmap operations * bitmap.h: Simple bitmap operations
* *
* Copyright (C) 2010 Red Hat, Inc.
* Copyright (C) 2010 Novell, Inc. * Copyright (C) 2010 Novell, Inc.
* *
* This library is free software; you can redistribute it and/or * This library is free software; you can redistribute it and/or
@ -58,7 +59,7 @@ virBitmapPtr virBitmapAlloc(size_t size)
virBitmapPtr bitmap; virBitmapPtr bitmap;
size_t sz; 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; return NULL;
sz = (size + VIR_BITMAP_BITS_PER_UNIT - 1) / sz = (size + VIR_BITMAP_BITS_PER_UNIT - 1) /