IB/mlx5: Fix mlx5_ib_alloc_mr error flow

ibmr.device is being set only after ib_alloc_mr() is
(successfully) complete. Therefore, in case mlx5_core_create_mkey()
return with error, the error flow calls mlx5_free_priv_descs()
which uses ibmr.device (which doesn't exist yet), causing
a NULL dereference oops.

To fix this, the IB device should be set in the mr struct earlier
stage (e.g. prior to calling mlx5_core_create_mkey()).

Fixes: 8a187ee ("IB/mlx5: Support the new memory registration API")
Signed-off-by: Max Gurtovoy <[email protected]>
Signed-off-by: Nitzan Carmi <[email protected]>
Signed-off-by: Leon Romanovsky <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>

drivers/infiniband/hw/mlx5/mr.c

@@ -1637,6 +1637,7 @@ struct ib_mr *mlx5_ib_alloc_mr(struct ib_pd *pd,
 	MLX5_SET(mkc, mkc, access_mode, mr->access_mode);
 	MLX5_SET(mkc, mkc, umr_en, 1);
 
+	mr->ibmr.device = pd->device;
 	err = mlx5_core_create_mkey(dev->mdev, &mr->mmkey, in, inlen);
 	if (err)
 		goto err_destroy_psv;