virtio_blk: Fix a slient kernel panic

We do a lot of memory allocation in function init_vq, and don't handle
the allocation failure properly. Then this function will return 0,
although initialization fails due to lacking memory. At that moment,
kernel will panic in guest machine, if virtio is used to drive disk.

To fix this bug, we should take care of allocation failure, and return
correct value to let caller know what happen.

Tested-by: Chao Fan <fanc.fnst@cn.fujitsu.com>
Signed-off-by: Minfei Huang <mnghuan@gmail.com>
Signed-off-by: Minfei Huang <minfei.hmf@alibaba-inc.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 1523e05c46fc95b29c47af3b51ebdc9f93af9029..93b1aaa5ba3be26d5de4d0a7b461ecc2fe7beb61 100644 (file)
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -391,22 +391,16 @@ static int init_vq(struct virtio_blk *vblk)
                num_vqs = 1;
 
        vblk->vqs = kmalloc(sizeof(*vblk->vqs) * num_vqs, GFP_KERNEL);
-       if (!vblk->vqs) {
-               err = -ENOMEM;
-               goto out;
-       }
+       if (!vblk->vqs)
+               return -ENOMEM;
 
        names = kmalloc(sizeof(*names) * num_vqs, GFP_KERNEL);
-       if (!names)
-               goto err_names;
-
        callbacks = kmalloc(sizeof(*callbacks) * num_vqs, GFP_KERNEL);
-       if (!callbacks)
-               goto err_callbacks;
-
        vqs = kmalloc(sizeof(*vqs) * num_vqs, GFP_KERNEL);
-       if (!vqs)
-               goto err_vqs;
+       if (!names || !callbacks || !vqs) {
+               err = -ENOMEM;
+               goto out;
+       }
 
        for (i = 0; i < num_vqs; i++) {
                callbacks[i] = virtblk_done;
@@ -417,7 +411,7 @@ static int init_vq(struct virtio_blk *vblk)
        /* Discover virtqueues and write information to configuration.  */
        err = vdev->config->find_vqs(vdev, num_vqs, vqs, callbacks, names);
        if (err)
-               goto err_find_vqs;
+               goto out;
 
        for (i = 0; i < num_vqs; i++) {
                spin_lock_init(&vblk->vqs[i].lock);
@@ -425,16 +419,12 @@ static int init_vq(struct virtio_blk *vblk)
        }
        vblk->num_vqs = num_vqs;
 
- err_find_vqs:
+out:
        kfree(vqs);
- err_vqs:
        kfree(callbacks);
- err_callbacks:
        kfree(names);
- err_names:
        if (err)
                kfree(vblk->vqs);
- out:
        return err;
 }