netdev - Re: [PATCH 3/8] vhost: vringh: use krealloc

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Date:   Tue, 27 Oct 2020 11:28:40 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Gustavo Padovan <gustavo@...ovan.org>,
        Christian König <christian.koenig@....com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Tony Luck <tony.luck@...el.com>,
        James Morse <james.morse@....com>,
        Robert Richter <rric@...nel.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Jason Wang <jasowang@...hat.com>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, linux-media@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
        linux-kernel@...r.kernel.org, linux-edac@...r.kernel.org,
        linux-gpio@...r.kernel.org, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-mm@...ck.org, alsa-devel@...a-project.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH 3/8] vhost: vringh: use krealloc_array()

On Tue, Oct 27, 2020 at 01:17:20PM +0100, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> 
> Use the helper that checks for overflows internally instead of manually
> calculating the size of the new array.
> 
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>

No problem with the patch, it does introduce some symmetry in the code.

Acked-by: Michael S. Tsirkin <mst@...hat.com>



> ---
>  drivers/vhost/vringh.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/vhost/vringh.c b/drivers/vhost/vringh.c
> index 8bd8b403f087..08a0e1c842df 100644
> --- a/drivers/vhost/vringh.c
> +++ b/drivers/vhost/vringh.c
> @@ -198,7 +198,8 @@ static int resize_iovec(struct vringh_kiov *iov, gfp_t gfp)
>  
>  	flag = (iov->max_num & VRINGH_IOV_ALLOCATED);
>  	if (flag)
> -		new = krealloc(iov->iov, new_num * sizeof(struct iovec), gfp);
> +		new = krealloc_array(iov->iov, new_num,
> +				     sizeof(struct iovec), gfp);
>  	else {
>  		new = kmalloc_array(new_num, sizeof(struct iovec), gfp);
>  		if (new) {
> -- 
> 2.29.1