netdev - Re: [PATCH net] rocker: move dereference before free

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] [day] [month] [year] [list]

Date:   Thu, 29 Jun 2017 14:19:47 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     dan.carpenter@...cle.com
Cc:     jiri@...nulli.us, arnd@...db.de, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH net] rocker: move dereference before free

From: Dan Carpenter <dan.carpenter@...cle.com>
Date: Wed, 28 Jun 2017 14:44:21 +0300

> My static checker complains that ofdpa_neigh_del() can sometimes free
> "found".   It just makes sense to use it first before deleting it.
> 
> Fixes: ecf244f753e0 ("rocker: fix maybe-uninitialized warning")
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

Applied, thanks.

> Most ref counting function use atomic_dec() but ofdpa_neigh_del() just
> uses normal decrement.  Are you sure this isn't racy?

A spinlock is held always when this counter is touched.