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| author | Michael S. Tsirkin <mst@redhat.com> | 2020-02-06 10:40:58 +0300 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2020-02-06 11:40:26 +0300 |
| commit | 6e9826e77249355c09db6ba41cd3f84e89f4b614 (patch) | |
| tree | 4834849240c6ba8f5fc5be47f3bfd378b40be720 /drivers/virtio/virtio_balloon.c | |
| parent | 782e067dba52de989a445f1bfa4bb770abb34480 (diff) | |
| download | linux-6e9826e77249355c09db6ba41cd3f84e89f4b614.tar.xz | |
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>
Diffstat (limited to 'drivers/virtio/virtio_balloon.c')
| -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 8e400ece9273..2457c54b6185 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -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. |