vhost: fix the memory leak which will happen when memory_access_ok fails

We need to free newmem when vhost_set_memory() fails to complete.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index e36620272715e061f5e7f5ff502a8d527b34769c..da21ae9518260f8f66b75498ec04141a3ef0cf60 100644 (file)
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -337,8 +337,10 @@ static long vhost_set_memory(struct vhost_dev *d, struct vhost_memory __user *m)
                return -EFAULT;
        }
 
-       if (!memory_access_ok(d, newmem, vhost_has_feature(d, VHOST_F_LOG_ALL)))
+       if (!memory_access_ok(d, newmem, vhost_has_feature(d, VHOST_F_LOG_ALL))) {
+               kfree(newmem);
                return -EFAULT;
+       }
        oldmem = d->memory;
        rcu_assign_pointer(d->memory, newmem);
        synchronize_rcu();