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virtio/vhost: minor fixes

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This fixes two minor bugs: error handling in vhost,
 and capability processing in virtio.
 
 Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

Pull minor virtio/vhost fixes from Michael Tsirkin:
 "This fixes two minor bugs: error handling in vhost, and capability
  processing in virtio"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
  vhost: fix error path in vhost_init_used()
  virtio-pci: read the right virtio_pci_notify_cap field
This commit is contained in:
Linus Torvalds 2016-03-03 11:07:32 -08:00
commit f4bd982208
2 changed files with 12 additions and 5 deletions
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15
drivers/vhost/vhost.c
View file

@ -1156,6 +1156,8 @@ int vhost_init_used(struct vhost_virtqueue *vq)
{
__virtio16 last_used_idx;
int r;
bool is_le = vq->is_le;
if (!vq->private_data) {
vq->is_le = virtio_legacy_is_little_endian();
return 0;
@ -1165,15 +1167,20 @@ int vhost_init_used(struct vhost_virtqueue *vq)
r = vhost_update_used_flags(vq);
if (r)
return r;
goto err;
vq->signalled_used_valid = false;
if (!access_ok(VERIFY_READ, &vq->used->idx, sizeof vq->used->idx))
return -EFAULT;
if (!access_ok(VERIFY_READ, &vq->used->idx, sizeof vq->used->idx)) {
r = -EFAULT;
goto err;
}
r = __get_user(last_used_idx, &vq->used->idx);
if (r)
return r;
goto err;
vq->last_used_idx = vhost16_to_cpu(vq, last_used_idx);
return 0;
err:
vq->is_le = is_le;
return r;
}
EXPORT_SYMBOL_GPL(vhost_init_used);

2
drivers/virtio/virtio_pci_modern.c
View file

@ -679,7 +679,7 @@ int virtio_pci_modern_probe(struct virtio_pci_device *vp_dev)
pci_read_config_dword(pci_dev,
notify + offsetof(struct virtio_pci_notify_cap,
cap.length),
cap.offset),
&notify_offset);
/* We don't know how many VQs we'll map, ahead of the time.