[Intel-wired-lan] [PATCH net] idpf: handle NULL adev in idpf_idc_vdev_mtu_event

[David Carlier]

idpf_idc_vport_dev_ctrl(adapter, false) sets vport->vdev_info->adev
to NULL but keeps vport->vdev_info itself. An MTU change after that
calls idpf_idc_vdev_mtu_event(), which derefs vdev_info->adev for
device_lock() before reaching the (!adev || ...) check.

NULL-check vdev_info->adev before locking.

Fixes: ed6e1c8796a4 ("idpf: implement IDC vport aux driver MTU change handler")
Cc: sta...@vger.kernel.org
Signed-off-by: David Carlier <devne...@gmail.com>
---
 drivers/net/ethernet/intel/idpf/idpf_idc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/idpf/idpf_idc.c 
b/drivers/net/ethernet/intel/idpf/idpf_idc.c
index b7d6b08fc89e..3ba52a80d52f 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_idc.c
+++ b/drivers/net/ethernet/intel/idpf/idpf_idc.c
@@ -162,9 +162,12 @@ void idpf_idc_vdev_mtu_event(struct 
iidc_rdma_vport_dev_info *vdev_info,
 
        set_bit(event_type, event.type);
 
+       if (!vdev_info->adev)
+               return;
+
        device_lock(&vdev_info->adev->dev);
        adev = vdev_info->adev;
-       if (!adev || !adev->dev.driver)
+       if (!adev->dev.driver)
                goto unlock;
        iadrv = container_of(adev->dev.driver,
                             struct iidc_rdma_vport_auxiliary_drv,
-- 
2.53.0