linux-kernel - Re: [PATCH] fs: reiserfs: free new_opts in reiserfs

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Date:   Wed, 27 Oct 2021 11:46:44 +0200
From:   Jan Kara <jack@...e.cz>
To:     Dongliang Mu <mudongliangabcd@...il.com>
Cc:     Yu Kuai <yukuai3@...wei.com>, Jan Kara <jack@...e.cz>,
        Miklos Szeredi <mszeredi@...hat.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        David Howells <dhowells@...hat.com>,
        reiserfs-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fs: reiserfs: free new_opts in reiserfs_remount

On Wed 27-10-21 11:39:25, Dongliang Mu wrote:
> Since the commit c3d98ea08291 ("VFS: Don't use save/replace_mount_options
> if not using generic_show_options") eliminates replace_mount_options
> in reiserfs, but did not handle the allocated new_opts,
> it will cause memory leak in the reiserfs_remount.
> 
> Fix this by freeing new_opts in the reiserfs_remount temporarily.
> 
> Fixes: c3d98ea08291 ("VFS: Don't use save/replace_mount_options if not using generic_show_options")
> Signed-off-by: Dongliang Mu <mudongliangabcd@...il.com>

Thanks for the patch but I can see that new_opts is not actually used at
all in reiserfs_remount() so we should perhaps just remove them (including
kstrdup() et al).

								Honza

> ---
>  fs/reiserfs/super.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c
> index 58481f8d63d5..b36865c8b66a 100644
> --- a/fs/reiserfs/super.c
> +++ b/fs/reiserfs/super.c
> @@ -1594,6 +1594,7 @@ static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
>  	}
>  
>  out_ok_unlocked:
> +	kfree(new_opts);
>  	return 0;
>  
>  out_err_unlock:
> -- 
> 2.25.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR