linux-kernel - Re: [PATCH] cgroup: Fix uninitialized variable warning

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:	Wed, 23 Dec 2015 16:35:19 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Ross Zwisler <ross.zwisler@...ux.intel.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Li Zefan <lizefan@...wei.com>,
	Daniel Wagner <daniel.wagner@...-carit.de>,
	Johannes Weiner <hannes@...xchg.org>, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org, Dave Jones <davej@...emonkey.org.uk>,
	kernel-team@...com, Aleksa Sarai <cyphar@...har.com>,
	Michal Hocko <mhocko@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Neil Horman <nhorman@...driver.com>
Subject: Re: [PATCH] cgroup: Fix uninitialized variable warning

Hello, Ross.

On Wed, Dec 23, 2015 at 02:30:40PM -0700, Ross Zwisler wrote:
>  static int mem_cgroup_can_attach(struct cgroup_taskset *tset)
>  {
>  	struct cgroup_subsys_state *css;
> -	struct mem_cgroup *memcg;
> +	struct mem_cgroup *memcg = NULL;

It's one thing to add spurious init to shut up gcc

> @@ -4805,7 +4805,7 @@ static int mem_cgroup_can_attach(struct cgroup_taskset *tset)
>  		p = leader;
>  		memcg = mem_cgroup_from_css(css);
>  	}
> -	if (!p)
> +	if (!p || !memcg)

and to another to add an additional processing on it.

Please note which gcc version you were using in the commit description
and mark the init with a comment.

Thanks.

-- 
tejun
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/