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| author | Michael S. Tsirkin <mst@redhat.com> | 2020-02-06 10:40:58 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-02-24 10:34:54 +0300 |
| commit | 55c549ea283cc3d681b41e9dd42b969cb480eeb9 (patch) | |
| tree | 4fb7182507635bf2d9726fbca610430583b74d2e /drivers/virtio | |
| parent | 3edf85591fb5d2738ed5daa3c8cc16332bb87eb9 (diff) | |
| download | linux-55c549ea283cc3d681b41e9dd42b969cb480eeb9.tar.xz | |
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>
Diffstat (limited to 'drivers/virtio')
| -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 14ac36ca8fbd..1afcbef397ab 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -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. |