linux-kernel - Re: [PATCH] gfs2: Fix error path kobject memory leak

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Date:   Mon, 13 May 2019 09:14:05 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     "Tobin C. Harding" <tobin@...nel.org>
Cc:     Bob Peterson <rpeterso@...hat.com>,
        Andreas Gruenbacher <agruenba@...hat.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>, cluster-devel@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gfs2: Fix error path kobject memory leak

On Mon, May 13, 2019 at 01:32:13PM +1000, Tobin C. Harding wrote:
> If a call to kobject_init_and_add() fails we must call kobject_put()
> otherwise we leak memory.
> 
> Function always calls kobject_init_and_add() which always calls
> kobject_init().
> 
> It is safe to leave object destruction up to the kobject release
> function and never free it manually.
> 
> Remove call to kfree() and always call kobject_put() in the error path.
> 
> Signed-off-by: Tobin C. Harding <tobin@...nel.org>
> ---
> 
> Is it ok to send patches during the merge window?
> 
> Applies on top of Linus' mainline tag: v5.1
> 
> Happy to rebase if there are conflicts.
> 
> thanks,
> Tobin.
> 
>  fs/gfs2/sys.c | 7 +------
>  1 file changed, 1 insertion(+), 6 deletions(-)
> 
> diff --git a/fs/gfs2/sys.c b/fs/gfs2/sys.c
> index 1787d295834e..98586b139386 100644
> --- a/fs/gfs2/sys.c
> +++ b/fs/gfs2/sys.c
> @@ -661,8 +661,6 @@ int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
>  	if (error)
>  		goto fail_reg;
>  
> -	sysfs_frees_sdp = 1; /* Freeing sdp is now done by sysfs calling
> -				function gfs2_sbd_release. */

You should also delete this variable at the top of the function, as it
is now only set once there and never used.

With that:

Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>