1 files changed, 49 insertions, 2 deletions

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 8b5a1b33d0fe..94701ff3a23a 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -212,6 +212,45 @@ static int vhost_worker(void *data)
 	}
 }
 
+/* Helper to allocate iovec buffers for all vqs. */
+static long vhost_dev_alloc_iovecs(struct vhost_dev *dev)
+{
+	int i;
+	for (i = 0; i < dev->nvqs; ++i) {
+		dev->vqs[i].indirect = kmalloc(sizeof *dev->vqs[i].indirect *
+					       UIO_MAXIOV, GFP_KERNEL);
+		dev->vqs[i].log = kmalloc(sizeof *dev->vqs[i].log * UIO_MAXIOV,
+					  GFP_KERNEL);
+		dev->vqs[i].heads = kmalloc(sizeof *dev->vqs[i].heads *
+					    UIO_MAXIOV, GFP_KERNEL);
+
+		if (!dev->vqs[i].indirect || !dev->vqs[i].log ||
+			!dev->vqs[i].heads)
+			goto err_nomem;
+	}
+	return 0;
+err_nomem:
+	for (; i >= 0; --i) {
+		kfree(dev->vqs[i].indirect);
+		kfree(dev->vqs[i].log);
+		kfree(dev->vqs[i].heads);
+	}
+	return -ENOMEM;
+}
+
+static void vhost_dev_free_iovecs(struct vhost_dev *dev)
+{
+	int i;
+	for (i = 0; i < dev->nvqs; ++i) {
+		kfree(dev->vqs[i].indirect);
+		dev->vqs[i].indirect = NULL;
+		kfree(dev->vqs[i].log);
+		dev->vqs[i].log = NULL;
+		kfree(dev->vqs[i].heads);
+		dev->vqs[i].heads = NULL;
+	}
+}
+
 long vhost_dev_init(struct vhost_dev *dev,
 		    struct vhost_virtqueue *vqs, int nvqs)
 {
@@ -229,6 +268,9 @@ long vhost_dev_init(struct vhost_dev *dev,
 	dev->worker = NULL;
 
 	for (i = 0; i < dev->nvqs; ++i) {
+		dev->vqs[i].log = NULL;
+		dev->vqs[i].indirect = NULL;
+		dev->vqs[i].heads = NULL;
 		dev->vqs[i].dev = dev;
 		mutex_init(&dev->vqs[i].mutex);
 		vhost_vq_reset(dev, dev->vqs + i);
@@ -295,6 +337,10 @@ static long vhost_dev_set_owner(struct vhost_dev *dev)
 	if (err)
 		goto err_cgroup;
 
+	err = vhost_dev_alloc_iovecs(dev);
+	if (err)
+		goto err_cgroup;
+
 	return 0;
 err_cgroup:
 	kthread_stop(worker);
@@ -345,6 +391,7 @@ void vhost_dev_cleanup(struct vhost_dev *dev)
 			fput(dev->vqs[i].call);
 		vhost_vq_reset(dev, dev->vqs + i);
 	}
+	vhost_dev_free_iovecs(dev);
 	if (dev->log_ctx)
 		eventfd_ctx_put(dev->log_ctx);
 	dev->log_ctx = NULL;
@@ -372,7 +419,7 @@ static int log_access_ok(void __user *log_base, u64 addr, unsigned long sz)
 	/* Make sure 64 bit math will not overflow. */
 	if (a > ULONG_MAX - (unsigned long)log_base ||
 	    a + (unsigned long)log_base > ULONG_MAX)
-		return -EFAULT;
+		return 0;
 
 	return access_ok(VERIFY_WRITE, log_base + a,
 			 (sz + VHOST_PAGE_SIZE * 8 - 1) / VHOST_PAGE_SIZE / 8);
@@ -957,7 +1004,7 @@ static int get_indirect(struct vhost_dev *dev, struct vhost_virtqueue *vq,
 	}
 
 	ret = translate_desc(dev, indirect->addr, indirect->len, vq->indirect,
-			     ARRAY_SIZE(vq->indirect));
+			     UIO_MAXIOV);
 	if (unlikely(ret < 0)) {
 		vq_err(vq, "Translation failure %d in indirect.\n", ret);
 		return ret;