diff options
| author | Michael S. Tsirkin <mst@redhat.com> | 2020-02-06 02:40:58 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-02-24 08:37:03 +0100 |
| commit | 77912b69a989629c72922df67d27bcabdd80832a (patch) | |
| tree | c68fd22bceb20173f86329f9055dbb18a7b9ffc9 | |
| parent | 9c80ae9650820f1f9578bc7289ddb6983a3b9651 (diff) | |
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: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/virtio/virtio_balloon.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c index c962d9b370c6..d2c4eb9efd70 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -157,6 +157,8 @@ 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. |