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>
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@ -157,6 +157,8 @@ static void set_page_pfns(struct virtio_balloon *vb,
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{
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{
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unsigned int i;
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unsigned int i;
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BUILD_BUG_ON(VIRTIO_BALLOON_PAGES_PER_PAGE > VIRTIO_BALLOON_ARRAY_PFNS_MAX);
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/*
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/*
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* Set balloon pfns pointing at this page.
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* Set balloon pfns pointing at this page.
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* Note that the first pfn points at start of the page.
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* Note that the first pfn points at start of the page.
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