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vhost-vdpa: return -EFAULT on copy_to_user() failure

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The copy_to_user() function returns the number of bytes remaining to be
copied.  However, we need to return a negative error code, -EFAULT, to
the user.

Fixes: 87f4c217413a ("vhost-vdpa: introduce uAPI to get the number of virtqueue groups")
Fixes: e96ef636f154 ("vhost-vdpa: introduce uAPI to get the number of address spaces")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Message-Id: <YotG1vXKXXSayr63@kili>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
This commit is contained in:
Dan Carpenter 2022-05-23 11:33:26 +03:00 committed by Michael S. Tsirkin
parent 1f97b97850
commit f4a8686ec7
1 changed files with 5 additions and 3 deletions
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8
drivers/vhost/vdpa.c
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@ -609,11 +609,13 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep,
r = vhost_vdpa_get_vring_num(v, argp);
break;
case VHOST_VDPA_GET_GROUP_NUM:
r = copy_to_user(argp, &v->vdpa->ngroups,
sizeof(v->vdpa->ngroups));
if (copy_to_user(argp, &v->vdpa->ngroups,
sizeof(v->vdpa->ngroups)))
r = -EFAULT;
break;
case VHOST_VDPA_GET_AS_NUM:
r = copy_to_user(argp, &v->vdpa->nas, sizeof(v->vdpa->nas));
if (copy_to_user(argp, &v->vdpa->nas, sizeof(v->vdpa->nas)))
r = -EFAULT;
break;
case VHOST_SET_LOG_BASE:
case VHOST_SET_LOG_FD: