linux-kernel - Re: [PATCH v2] fs: affs: fix a memory leak in affs

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Date:   Wed, 2 Oct 2019 11:59:40 -0500
From:   Navid Emamdoost <navid.emamdoost@...il.com>
To:     David Sterba <dsterba@...e.cz>
Cc:     Markus Elfring <Markus.Elfring@....de>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Deepa Dinamani <deepa.kernel@...il.com>,
        Jeff Layton <jlayton@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        David Sterba <dsterba@...e.com>,
        Navid Emamdoost <emamd001@....edu>, Kangjie Lu <kjlu@....edu>,
        Stephen McCamant <smccaman@....edu>,
        linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH v2] fs: affs: fix a memory leak in affs_remount

Thanks David,

On Wed, Oct 2, 2019 at 4:22 AM David Sterba <dsterba@...e.cz> wrote:
>
> On Mon, Sep 30, 2019 at 04:01:10PM -0500, Navid Emamdoost wrote:
> > In affs_remount if data is provided it is duplicated into new_opts.
> > The allocated memory for new_opts is only released if pare_options fail.
> > The release for new_opts is added.
>
> A variable that is allocated and freed without use should ring a bell to
> look closer at the code. There's a bit of history behind new_options,
> originally there was save/replace options on the VFS layer so the 'data'
> passed must not change (thus strdup), this got cleaned up in later
> patches. But not completely.
>
> There's no reason to do the strdup in cases where the filesystem does
> not need to reuse the 'data' again, because strsep would modify it
> directly.
>
> So new_opts should be removed.

I will send a new patch with the unused variable removed.


-- 
Navid.