1 files changed, 5 insertions, 2 deletions

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 58146457bf97..ed3c4e7c1008 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -648,7 +648,10 @@ int __kvm_set_memory_region(struct kvm *kvm,
                 goto out;
         if (mem->guest_phys_addr & (PAGE_SIZE - 1))
                 goto out;
-        if (user_alloc && (mem->userspace_addr & (PAGE_SIZE - 1)))
+        /* We can read the guest memory with __xxx_user() later on. */
+        if (user_alloc &&
+            ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
+             !access_ok(VERIFY_WRITE, mem->userspace_addr, mem->memory_size)))
                 goto out;
         if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
                 goto out;
@@ -1283,7 +1286,7 @@ int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
         addr = gfn_to_hva(kvm, gfn);
         if (kvm_is_error_hva(addr))
                 return -EFAULT;
-        r = copy_from_user(data, (void __user *)addr + offset, len);
+        r = __copy_from_user(data, (void __user *)addr + offset, len);
         if (r)
                 return -EFAULT;
         return 0;