Commit 6e9826e7 authored Feb 06, 2020 by Michael S. Tsirkin

virtio_balloon: prevent pfn array overflow



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>

parent 782e067d

drivers/virtio/virtio_balloon.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -158,6 +158,8 @@ 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.

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