[PATCH] Fix vhost-user buffer over-read on ram hot-unplug

[Raphael Norwitz]

The VHOST_USER_PROTOCOL_F_CONFIGURE_MEM_SLOTS vhost-user protocol
feature introduced a shadow-table, used by the backend to dynamically
determine how a vdev's memory regions have changed since the last
vhost_user_set_mem_table() call. On hot-remove, a memmove() operation
is used to overwrite the removed shadow region descriptor(s). The size
parameter of this memmove was off by 1 such that if a VM with a backend
supporting the VHOST_USER_PROTOCOL_F_CONFIGURE_MEM_SLOTS filled it's
shadow-table (by performing the maximum number of supported hot-add
operatons) and attempted to remove the last region, Qemu would read an
out of bounds value and potentially crash.

This change fixes the memmove() bounds such that this erroneous read can
never happen.

Signed-off-by: Peter Turschmid <peter.turschm@nutanix.com>
Signed-off-by: Raphael Norwitz <raphael.norwitz@nutanix.com>
---
 hw/virtio/vhost-user.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c
index 3123121..d7e2423 100644
--- a/hw/virtio/vhost-user.c
+++ b/hw/virtio/vhost-user.c
@@ -672,7 +672,7 @@ static int send_remove_regions(struct vhost_dev *dev,
         memmove(&u->shadow_regions[shadow_reg_idx],
                 &u->shadow_regions[shadow_reg_idx + 1],
                 sizeof(struct vhost_memory_region) *
-                (u->num_shadow_regions - shadow_reg_idx));
+                (u->num_shadow_regions - shadow_reg_idx - 1));
         u->num_shadow_regions--;
     }
 
-- 
1.8.3.1