linux-kernel - Re: [PATCH] isofs: fix potential memory leak in mount option parsing

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Message-ID: <20180416074811.4wqibq6woptzcwfh@quack2.suse.cz>
Date:   Mon, 16 Apr 2018 09:48:11 +0200
From:   Jan Kara <jack@...e.cz>
To:     Chengguang Xu <cgxu519@....com>
Cc:     jack@...e.cz, dhowells@...hat.com, elfring@...rs.sourceforge.net,
        viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] isofs: fix potential memory leak in mount option parsing

On Sat 14-04-18 20:16:06, Chengguang Xu wrote:
> When specifying string type mount option (e.g., iocharset)
> several times in a mount, current option parsing may
> cause memory leak. Hence, call kfree for previous one
> in this case. Meanwhile, check memory allocation result
> for it.
> 
> Signed-off-by: Chengguang Xu <cgxu519@....com>

Thanks. I've added the patch to my tree.

								Honza

> ---
>  fs/isofs/inode.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
> index bc258a4..ec3fba7 100644
> --- a/fs/isofs/inode.c
> +++ b/fs/isofs/inode.c
> @@ -394,7 +394,10 @@ static int parse_options(char *options, struct iso9660_options *popt)
>  			break;
>  #ifdef CONFIG_JOLIET
>  		case Opt_iocharset:
> +			kfree(popt->iocharset);
>  			popt->iocharset = match_strdup(&args[0]);
> +			if (!popt->iocharset)
> +				return 0;
>  			break;
>  #endif
>  		case Opt_map_a:
> -- 
> 1.8.3.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR