linux-kernel - Re: [Drbd-dev] [PATCH 2/5] drivers/block: Correct NULL test

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Date:	Mon, 4 Jan 2010 12:09:35 +0100
From:	Philipp Reisner <philipp.reisner@...bit.com>
To:	drbd-dev@...ts.linbit.com, linux-kernel@...r.kernel.org
Cc:	Julia Lawall <julia@...u.dk>, kernel-janitors@...r.kernel.org
Subject: Re: [Drbd-dev] [PATCH 2/5] drivers/block: Correct NULL test

Hi,

The patch titeled "drivers/block: Correct NULL test" is in the
git://git.drbd.org/linux-2.6-drbd.git for-jens tree and will
flow upstream from there.

-Phil

Full quote:
> From: Julia Lawall <julia@...u.dk>
> 
> Test the just-allocated value for NULL rather than some other value.
> 
> The semantic patch that makes this change is as follows:
> (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @@
> expression x,y;
> statement S;
> @@
> 
> x = \(kmalloc\|kcalloc\|kzalloc\)(...);
> (
> if ((x) == NULL) S
> 
> if (
> -   y
> +   x
>        == NULL)
>  S
> )
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>
> 
> ---
>  drivers/block/drbd/drbd_receiver.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff -u -p a/drivers/block/drbd/drbd_receiver.c
>  b/drivers/block/drbd/drbd_receiver.c ---
>  a/drivers/block/drbd/drbd_receiver.c
> +++ b/drivers/block/drbd/drbd_receiver.c
> @@ -3944,7 +3944,7 @@ static int drbd_do_auth(struct drbd_conf
>  	}
> 
>  	right_response = kmalloc(resp_size, GFP_NOIO);
> -	if (response == NULL) {
> +	if (right_response == NULL) {
>  		dev_err(DEV, "kmalloc of right_response failed\n");
>  		rv = 0;
>  		goto fail;
--
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