# Re: \[PATCH 3/8\] vhost: vringh: use krealloc\_array()

- From: Michael S. Tsirkin \<mst@redhat.com\>
- Date: 2020-10-27 15:56:56 
- List: netdev
- Page: https://ratatoskr.run/netdev/2020/10/6152858
- Thread: https://ratatoskr.run/linux-media/2020/10/6151361/t.md

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

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

Acked-by: Michael S. Tsirkin <mst@redhat.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

```