linux-kernel - Re: [PATCH] cifs: Use kcalloc instead of kzalloc to allocate array

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Message-ID: <20111205142703.697a52c6@corrin.poochiereds.net>
Date:	Mon, 5 Dec 2011 14:27:03 -0500
From:	Jeff Layton <jlayton@...ba.org>
To:	Thomas Meyer <thomas@...3r.de>
Cc:	linux-cifs@...r.kernel.org, samba-technical@...ts.samba.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cifs: Use kcalloc instead of kzalloc to allocate array

On Tue, 29 Nov 2011 22:08:00 +0100
Thomas Meyer <thomas@...3r.de> wrote:

> The advantage of kcalloc is, that will prevent integer overflows which could
> result from the multiplication of number of elements and size and it is also
> a bit nicer to read.
> 
> The semantic patch that makes this change is available
> in https://lkml.org/lkml/2011/11/25/107
> 
> Signed-off-by: Thomas Meyer <thomas@...3r.de>
> ---
> 
> diff -u -p a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
> --- a/fs/cifs/cifssmb.c 2011-11-13 11:07:56.343959560 +0100
> +++ b/fs/cifs/cifssmb.c 2011-11-28 19:47:15.006997976 +0100
> @@ -2140,7 +2140,7 @@ cifs_async_writev(struct cifs_writedata
>  		goto async_writev_out;
>  
>  	/* 1 iov per page + 1 for header */
> -	iov = kzalloc((wdata->nr_pages + 1) * sizeof(*iov), GFP_NOFS);
> +	iov = kcalloc(wdata->nr_pages + 1, sizeof(*iov), GFP_NOFS);
>  	if (iov == NULL) {
>  		rc = -ENOMEM;
>  		goto async_writev_out;
> --
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Looks correct.

Reviewed-by: Jeff Layton <jlayton@...ba.org>
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