From: Ignacy Gawędzki <ignacy.gawedzki@green-communications.fr>
Date: Tue, 3 Feb 2015 18:05:18 +0000 (+0100)
Subject: cls_api.c: Fix dumping of non-existing actions' stats.
X-Git-Tag: fixes-v4.0-rc1~200^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b057df24a7536cce6c372efe9d0e3d1558afedf4;p=pandora-kernel.git

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>
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