In vfio_device_open(), vfio_container_device_register() is always called
when open_count == 1. On error, vfio_device_container_unregister() is
only called when open_count == 1 and close_device is set. This leaks a
registration for devices without a close_device implementation.
In vfio_device_fops_release(), vfio_device_container_unregister() is
called unconditionally. This can cause a device to be unregistered
multiple times.
Treating container device registration/unregistration uniformly (always
when open_count == 1) fixes both issues.
Fixes: ce4b4657ff18 ("vfio: Replace the DMA unmapping notifier with a callback")
Signed-off-by: Anthony DeRossi <ajderossi@xxxxxxxxx>
---
drivers/vfio/vfio_main.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c
index 2d168793d4e1..9a4af880e941 100644
--- a/drivers/vfio/vfio_main.c
+++ b/drivers/vfio/vfio_main.c
@@ -801,8 +801,9 @@ static struct file *vfio_device_open(struct vfio_device *device)
err_close_device:
mutex_lock(&device->dev_set->lock);
mutex_lock(&device->group->group_lock);
- if (device->open_count == 1 && device->ops->close_device) {
- device->ops->close_device(device);
+ if (device->open_count == 1) {
+ if (device->ops->close_device)
+ device->ops->close_device(device);
vfio_device_container_unregister(device);
}
@@ -1017,10 +1018,12 @@ static int vfio_device_fops_release(struct inode *inode, struct file *filep)
mutex_lock(&device->dev_set->lock);
vfio_assert_device_open(device);
mutex_lock(&device->group->group_lock);
- if (device->open_count == 1 && device->ops->close_device)
- device->ops->close_device(device);
+ if (device->open_count == 1) {
+ if (device->ops->close_device)
+ device->ops->close_device(device);
- vfio_device_container_unregister(device);
+ vfio_device_container_unregister(device);
+ }
mutex_unlock(&device->group->group_lock);
device->open_count--;
if (device->open_count == 0)
--
2.37.4
