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virBitmapNewQuiet: Don't fail on unlikely overflow scenario

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Modify the condition which would make virBitmapNewQuiet fail to possibly
overallocate by 1 rather than failing.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Peter Krempa 2020-10-01 16:52:30 +02:00
parent 6d6480c462
commit bbeab0479c
1 changed files with 8 additions and 6 deletions
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14
src/util/virbitmap.c
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@ -55,8 +55,7 @@ struct _virBitmap {
*
* Allocate a bitmap capable of containing @size bits.
*
* Returns a pointer to the allocated bitmap or NULL if memory cannot be
* allocated. Does not report libvirt errors.
* Returns a pointer to the allocated bitmap.
*/
virBitmapPtr
virBitmapNewQuiet(size_t size)
@ -64,10 +63,13 @@ virBitmapNewQuiet(size_t size)
virBitmapPtr bitmap;
size_t sz;
if (SIZE_MAX - VIR_BITMAP_BITS_PER_UNIT < size)
return NULL;
sz = VIR_DIV_UP(size, VIR_BITMAP_BITS_PER_UNIT);
if (SIZE_MAX - VIR_BITMAP_BITS_PER_UNIT < size) {
/* VIR_DIV_UP would overflow, let's overallocate by 1 entry instead of
* the potential overflow */
sz = (size / VIR_BITMAP_BITS_PER_UNIT) + 1;
} else {
sz = VIR_DIV_UP(size, VIR_BITMAP_BITS_PER_UNIT);
}
bitmap = g_new0(virBitmap, 1);