linux-kernel - Re: [PATCH] [resend] ACPI: Fix memory leak in acpi_bind

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Date:	Mon, 15 Oct 2012 14:01:27 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Jesper Juhl <jj@...osbits.net>
Cc:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Len Brown <lenb@...nel.org>
Subject: Re: [PATCH] [resend] ACPI: Fix memory leak in acpi_bind_one() (fwd)

On Mon, 2012-10-15 at 20:51 +0200, Jesper Juhl wrote:
> Ok, so I had a little problem with my mail servers clock that caused the 
> mail below to be timestamped a few years in the past, so I assume noone 
> saw it - thus, resending.
> 
> -- 
> Jesper Juhl <jj@...osbits.net>       http://www.chaosbits.net/
> Don't top-post http://www.catb.org/jargon/html/T/top-post.html
> Plain text mails only, please.
> 
> 
> ---------- Forwarded message ----------
> Date: Sun, 9 Nov 2008 14:38:30 +0100 (CET)
> From: Jesper Juhl <jj@...osbits.net>
> To: linux-acpi@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org, Len Brown <lenb@...nel.org>
> Subject: [PATCH] ACPI: Fix memory leak in acpi_bind_one()
> 
> Memory is allocated with kzalloc() and assigned to
> 'physical_node'. Then 'physical_node->node_id' is initialized with a
> call to 'find_first_zero_bit()', if that results in a value greater
> than ACPI_MAX_PHYSICAL_NODE we'll end up jumping to the 'err:' label
> and there leave the function and let 'physical_node' go out of scope
> and leak the memory we allocated.
> This patch fixes the leak by simply freeing the unused/unneeded memory
> pointed to by 'physical_node' just before we jump to 'err:'.
> 
> Signed-off-by: Jesper Juhl <jj@...osbits.net>

Looks good.

Reviewed-by: Toshi Kani <toshi.kani@...com>

-Toshi

> ---
>  drivers/acpi/glue.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
> index d1a2d74..0837308 100644
> --- a/drivers/acpi/glue.c
> +++ b/drivers/acpi/glue.c
> @@ -159,6 +159,7 @@ static int acpi_bind_one(struct device *dev, acpi_handle handle)
>  	if (physical_node->node_id >= ACPI_MAX_PHYSICAL_NODE) {
>  		retval = -ENOSPC;
>  		mutex_unlock(&acpi_dev->physical_node_lock);
> +		kfree(physical_node);
>  		goto err;
>  	}
>  
> -- 
> 1.7.1
> 
> 


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