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Commit 55c549ea authored by Michael S. Tsirkin's avatar Michael S. Tsirkin Committed by Greg Kroah-Hartman
Browse files

virtio_balloon: prevent pfn array overflow 



[ Upstream commit 6e9826e77249355c09db6ba41cd3f84e89f4b614 ]

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: default avatarMichael S. Tsirkin <mst@redhat.com>
Reviewed-by: default avatarDavid Hildenbrand <david@redhat.com>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 3edf8559

drivers/virtio/virtio_balloon.c

+2 −0
Original line number Diff line number Diff line
@@ -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.