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authorMichael S. Tsirkin <mst@redhat.com>2020-02-06 10:40:58 +0300
committerMichael S. Tsirkin <mst@redhat.com>2020-02-06 11:40:26 +0300
commit6e9826e77249355c09db6ba41cd3f84e89f4b614 (patch)
tree4834849240c6ba8f5fc5be47f3bfd378b40be720 /drivers/virtio
parent782e067dba52de989a445f1bfa4bb770abb34480 (diff)
downloadlinux-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')
-rw-r--r--drivers/virtio/virtio_balloon.c2
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.