linux-kernel - Re: [PATCH 2/2] hfsplus: fix potential refcnt problem of nls module

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Message-ID: <1524071461.2606.8.camel@dubeyko.com>
Date:   Wed, 18 Apr 2018 10:11:01 -0700
From:   Viacheslav Dubeyko <slava@...eyko.com>
To:     Chengguang Xu <cgxu519@....com>, linux-fsdevel@...r.kernel.org
Cc:     dhowells@...hat.com, kstewart@...uxfoundation.org,
        gregkh@...uxfoundation.org, tglx@...utronix.de,
        pombredanne@...b.com, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 2/2] hfsplus: fix potential refcnt problem of nls module

On Tue, 2018-04-17 at 15:05 +0800, Chengguang Xu wrote:
> When specifying nls option multiple times in a mount,
> current option parsing will cause inaccurate refcount of nls
> module. Hence, call unload_nls for previous one in this case.
> 
> Signed-off-by: Chengguang Xu <cgxu519@....com>


Looks good.

Reviewed-by: Vyacheslav Dubeyko <slava@...eyko.com>

Thanks,
Vyacheslav Dubeyko.


> ---
>  fs/hfsplus/options.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/hfsplus/options.c b/fs/hfsplus/options.c
> index 047e05c..068d4e2 100644
> --- a/fs/hfsplus/options.c
> +++ b/fs/hfsplus/options.c
> @@ -171,8 +171,10 @@ int hfsplus_parse_options(char *input, struct
> hfsplus_sb_info *sbi)
>  				return 0;
>  			}
>  			p = match_strdup(&args[0]);
> -			if (p)
> +			if (p) {
> +				unload_nls(sbi->nls);
>  				sbi->nls = load_nls(p);
> +			}
>  			if (!sbi->nls) {
>  				pr_err("unable to load nls mapping
> \"%s\"\n",
>  				       p);