linux-kernel - Re: [PATCH] cgroup: Fix an error handling path in alloc_pagecache_max

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Message-ID: <20220523134823.lcbruwv5eodueoag@dev0025.ash9.facebook.com>
Date:   Mon, 23 May 2022 06:48:23 -0700
From:   David Vernet <void@...ifault.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     dan.carpenter@...cle.com, Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Shakeel Butt <shakeelb@...gle.com>,
        Muchun Song <songmuchun@...edance.com>,
        Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
        Shuah Khan <shuah@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        cgroups@...r.kernel.org, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH] cgroup: Fix an error handling path in
 alloc_pagecache_max_30M()

On Sun, May 22, 2022 at 04:18:51PM +0200, Christophe JAILLET wrote:
> If the first goto is taken, 'fd' is not opened yet (and is un-initialized).
> So a direct return is safer.
> 
> Fixes: c1a31a2f7a9c ("cgroup: fix racy check in alloc_pagecache_max_30M() helper function")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
>  tools/testing/selftests/cgroup/test_memcontrol.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/cgroup/test_memcontrol.c b/tools/testing/selftests/cgroup/test_memcontrol.c
> index c3d0d5f7b19c..8833359556f3 100644
> --- a/tools/testing/selftests/cgroup/test_memcontrol.c
> +++ b/tools/testing/selftests/cgroup/test_memcontrol.c
> @@ -448,7 +448,7 @@ static int alloc_pagecache_max_30M(const char *cgroup, void *arg)
>  	high = cg_read_long(cgroup, "memory.high");
>  	max = cg_read_long(cgroup, "memory.max");
>  	if (high != MB(30) && max != MB(30))
> -		goto cleanup;
> +		return -1;
>  
>  	fd = get_temp_fd();
>  	if (fd < 0)
> -- 
> 2.34.1
> 

Acked-by: David Vernet <void@...ifault.com>