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virtio_balloon: prevent pfn array overflow 

[ Upstream commit 6e9826e772 ]

Make sure, at build time, that pfn array is big enough to hold a single
page.  It happens to be true since the PAGE_SHIFT value at the moment is
20, which is 1M - exactly 256 4K balloon pages.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Michael S. Tsirkin 2020-02-06 02:40:58 -05:00 committed by Greg Kroah-Hartman
parent 3edf85591f
commit 55c549ea28
1 changed files with 2 additions and 0 deletions
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2
drivers/virtio/virtio_balloon.c
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@ -126,6 +126,8 @@ static void set_page_pfns(struct virtio_balloon *vb,
{
unsigned int i;
BUILD_BUG_ON(VIRTIO_BALLOON_PAGES_PER_PAGE > VIRTIO_BALLOON_ARRAY_PFNS_MAX);
/*
* Set balloon pfns pointing at this page.
* Note that the first pfn points at start of the page.