diff options
Diffstat (limited to 'drivers/vfio/vfio_main.c')
| -rw-r--r-- | drivers/vfio/vfio_main.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c index c37fc14599d0..be5e4ddd5901 100644 --- a/drivers/vfio/vfio_main.c +++ b/drivers/vfio/vfio_main.c @@ -492,6 +492,13 @@ int vfio_df_open(struct vfio_device_file *df) lockdep_assert_held(&device->dev_set->lock); + /* + * Only the group path allows the device to be opened multiple + * times. The device cdev path doesn't have a secure way for it. + */ + if (device->open_count != 0 && !df->group) + return -EINVAL; + device->open_count++; if (device->open_count == 1) { ret = vfio_df_device_first_open(df); |