On Mon, Nov 27, 2017 at 11:11 AM, Jakub Kicinski
<jakub.kicin...@netronome.com> wrote:
> When cls_bpf offload was added it seemed like a good idea to
> call cls_bpf_delete_prog() instead of extending the error
> handling path, since the software state is fully initialized
> at that point. This handling of errors without jumping to
> the end of the function is error prone, as proven by later
> commit missing that extra call to __cls_bpf_delete_prog().
>
> __cls_bpf_delete_prog() is now expected to be invoked with
> a reference on exts->net or the field zeroed out. The call
> on the offload's error patch does not fullfil this requirement,
> leading to each error stealing a reference on net namespace.
>
> Create a function undoing what cls_bpf_set_parms() did and
> use it from __cls_bpf_delete_prog() and the error path.
>
> Fixes: aae2c35ec892 ("cls_bpf: use tcf_exts_get_net() before call_rcu()")
> Signed-off-by: Jakub Kicinski <jakub.kicin...@netronome.com>
> Reviewed-by: Simon Horman <simon.hor...@netronome.com>
Acked-by: Cong Wang <xiyou.wangc...@gmail.com>
Thanks.
