netdev - Re: [PATCH net] net: sched: fix unbalance in the error path of tca_action

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 15 Feb 2018 20:05:16 +0100
From:   Davide Caratti <dcaratti@...hat.com>
To:     Jamal Hadi Salim <jhs@...atatu.com>, Jiri Pirko <jiri@...nulli.us>,
        Cong Wang <xiyou.wangcong@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net] net: sched: fix unbalance in the error path of
 tca_action_flush()

On Thu, 2018-02-15 at 10:31 -0500, Jamal Hadi Salim wrote:
> On 18-02-15 09:50 AM, Davide Caratti wrote:
> > When tca_action_flush() calls the action walk() and gets an error,
> > a successful call to nla_nest_start() is not followed by a call to
> > nla_nest_cancel(). It's harmless, as the skb is freed in the error
> > path - but it's worth to fix this unbalance.
> 
> Kind of pushing the boundaries saying this targets net tree - there is
> no bug you are fixing (as you say the sk is freed).
> Maybe it makes the code prettier ...

you are right, this fix is only cosmetic as long as the skb is no more
used after walk() returns an error. It just triggered the doubt to me
while I was reading the series that added support to ext_acks, and this is
the followup.

David, please apply to net-next (or drop it, at your convenience).

thank you in advance,
-- 
davide