linux-kernel - Re: [PATCH] (for review and testing first) Implement dynamic allocated array for pnp port/io resources

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Date:	Wed, 15 Aug 2007 17:16:45 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	trenn@...e.de
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	"Bjorn Helgaas" <bjorn.helgaas@...com>,
	"Jean Delvare" <khali@...ux-fr.org>, abelay@...ell.com,
	"Andi Kleen" <ak@...e.de>, linux-acpi <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH] (for review and testing first) Implement dynamic allocated array for pnp port/io resources

Hi Thomas,

On 8/15/07, Thomas Renninger <trenn@...e.de> wrote:
> +int pnp_port_alloc (struct pnp_resource_table *res)
> +{
> +       int ret = 0, i;
> +       if (res->allocated_ports == 0) {
> +               res->port_resource = kmalloc(sizeof(struct resource)
> +                                                 * PNP_ALLOC_PORTS,
> +                                                 GFP_KERNEL);

No need to use kmalloc() here. It's enough that you make sure
res->port_resource is NULL when res->allocated_ports is zero and
krealloc() will do the right thing.

On 8/15/07, Thomas Renninger <trenn@...e.de> wrote:
> +               if (!res->port_resource) {
> +                       ret = -ENOMEM;
> +                       goto out;
> +               }
> +       } else {
> +               res->port_resource = krealloc(res->port_resource,
> +                                           (sizeof(struct resource)
> +                                            * res->allocated_ports)
> +                                           +
> +                                           (sizeof(struct resource)
> +                                            * PNP_ALLOC_PORTS),
> +                                           GFP_KERNEL);

Assuming res->port_resource is non-NULL here and krealloc() fails,
you've leaked the originally allocated memory.

                                         Pekka
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