IB/core: Nullify ib_uobject during allocation

Currently, we initialize all fields of ib_uobject straight after
allocation. Therefore, a kmalloc was sufficient. Since ib_uobject
could be embedded in a type specific structure, we nullify it to
spare programmer errors.

Fixes: 3832125624b7 ('IB/core: Add support for idr types')
Signed-off-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/core/rdma_core.c

@@ -84,7 +84,7 @@ static int uverbs_try_lock_object(struct ib_uobject *uobj, bool exclusive)
 static struct ib_uobject *alloc_uobj(struct ib_ucontext *context,
 				     const struct uverbs_obj_type *type)
 {
-	struct ib_uobject *uobj = kmalloc(type->obj_size, GFP_KERNEL);
+	struct ib_uobject *uobj = kzalloc(type->obj_size, GFP_KERNEL);
 
 	if (!uobj)
 		return ERR_PTR(-ENOMEM);