[PATCH V4 1/9] vhost: don't set uaddr for invalid address
From: Jason Wang <jasowang@redhat.com>
Date: 2019-08-07 07:06:09
Subsystem:
the rest, virtio host (vhost) · Maintainers:
Linus Torvalds, "Michael S. Tsirkin", Jason Wang
We should not setup uaddr for the invalid address, otherwise we may
try to pin or prefetch mapping of wrong pages.
Fixes: 7f466032dc9e ("vhost: access vq metadata through kernel virtual address")
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
drivers/vhost/vhost.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 0536f8526359..488380a581dc 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c@@ -2082,7 +2082,8 @@ static long vhost_vring_set_num_addr(struct vhost_dev *d, } #if VHOST_ARCH_CAN_ACCEL_UACCESS - vhost_setup_vq_uaddr(vq); + if (r == 0) + vhost_setup_vq_uaddr(vq); if (d->mm) mmu_notifier_register(&d->mmu_notifier, d->mm);
--
2.18.1