virtio_balloon: prevent pfn array overflow

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[ 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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Michael S. Tsirkin 2020-02-06 02:40:58 -05:00 • committed by Greg Kroah-Hartman

parent 0c98725892

commit 2e8420b46f

1 changed files with 2 additions and 0 deletions

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drivers/virtio/virtio_balloon.c

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