tree 4c062e5a5eb0c470ff686b741d85814ba66a593a
parent 3725a269815ba6dbb415feddc47da5af7d1fac58
author Ignacy Gawędzki <ignacy.gawedzki@green-communications.fr> 1422986718 +0100
committer David S. Miller <davem@davemloft.net> 1423110372 -0800

cls_api.c: Fix dumping of non-existing actions' stats.

In tcf_exts_dump_stats(), ensure that exts->actions is not empty before
accessing the first element of that list and calling tcf_action_copy_stats()
on it.  This fixes some random segvs when adding filters of type "basic" with
no particular action.

This also fixes the dumping of those "no-action" filters, which more often
than not made calls to tcf_action_copy_stats() fail and consequently netlink
attributes added by the caller to be removed by a call to nla_nest_cancel().

Fixes: 33be62715991 ("net_sched: act: use standard struct list_head")
Signed-off-by: Ignacy Gawędzki <ignacy.gawedzki@green-communications.fr>
Acked-by: Cong Wang <cwang@twopensource.com>
Signed-off-by: David S. Miller <davem@davemloft.net>