From bdc1681cdf1ab6a65fa935a2b3f8fc63b20c54ea Mon Sep 17 00:00:00 2001 From: Rusty Russell Date: Mon, 17 Mar 2008 22:58:15 -0500 Subject: [PATCH] virtio: handle > 2 billion page balloon targets If the host asks for a huge target towards_target() can overflow, and we up oops as we try to release more pages than we have. The simple fix is to use a 64-bit value. Signed-off-by: Rusty Russell --- drivers/virtio/virtio_balloon.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c index c8a4332d1132..0b3efc31ee6d 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -152,7 +152,7 @@ static void virtballoon_changed(struct virtio_device *vdev) wake_up(&vb->config_change); } -static inline int towards_target(struct virtio_balloon *vb) +static inline s64 towards_target(struct virtio_balloon *vb) { u32 v; __virtio_config_val(vb->vdev, @@ -176,7 +176,7 @@ static int balloon(void *_vballoon) set_freezable(); while (!kthread_should_stop()) { - int diff; + s64 diff; try_to_freeze(); wait_event_interruptible(vb->config_change, -- 2.20.1