Re: [PATCH] usb: iowarrior: replace kmalloc with kmalloc_array

From: Gustavo A. R. Silva
Date: Thu Aug 23 2018 - 14:07:10 EST


Hi,

Please, drop this.

I'll align GFP_KERNEL and send v2.

Thanks
--
Gustavo

On 8/23/18 12:31 PM, Gustavo A. R. Silva wrote:
> A common flaw in the kernel is integer overflow during memory allocation
> size calculations. In an effort to reduce the frequency of these bugs,
> kmalloc_array was implemented, which allocates memory for an array,
> while at the same time detects integer overflow.
>
> This patch replaces cases of:
>
> kmalloc(a * b, gfp)
>
> with:
> kmalloc_array(a * b, gfp)
>
> Signed-off-by: Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>
> ---
> drivers/usb/misc/iowarrior.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/usb/misc/iowarrior.c b/drivers/usb/misc/iowarrior.c
> index c2991b8..7a22400 100644
> --- a/drivers/usb/misc/iowarrior.c
> +++ b/drivers/usb/misc/iowarrior.c
> @@ -808,7 +808,7 @@ static int iowarrior_probe(struct usb_interface *interface,
> dev->int_in_endpoint->bInterval);
> /* create an internal buffer for interrupt data from the device */
> dev->read_queue =
> - kmalloc(((dev->report_size + 1) * MAX_INTERRUPT_BUFFER),
> + kmalloc_array(dev->report_size + 1, MAX_INTERRUPT_BUFFER,
> GFP_KERNEL);
> if (!dev->read_queue)
> goto error;
>