linux-kernel - Re: [PATCH] drivers/acpi: fix memory leak in acpi_device_set

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Message-Id: <200909040923.03457.bjorn.helgaas@hp.com>
Date:	Fri, 4 Sep 2009 09:23:02 -0600
From:	Bjorn Helgaas <bjorn.helgaas@...com>
To:	Xiaotian Feng <dfeng@...hat.com>
Cc:	len.brown@...el.com, rui.zhang@...el.com, yakui.zhao@...el.com,
	ak@...ux.intel.com, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers/acpi: fix memory leak in acpi_device_set_id

On Friday 04 September 2009 01:00:19 am Xiaotian Feng wrote:
> In acpi_device_set_id, if cid_list is allocated by ACPI_ALLOCATE_ZEROED,
> it is never freed. This patch fixes the memory leak. 

There are several recent changes to this code that remove this leak.
The current acpi-test version:

http://git.kernel.org/?p=linux/kernel/git/lenb/linux-acpi-2.6.git;a=blob;f=drivers/acpi/scan.c;h=e218ec5c6be046171e08a0f2d95a751aee2a9aec;hb=test

does not have the leak, as far as I can tell, because it doesn't have
the cid_list kmalloc().

If it's a serious issue, your patch might be appropriate for -stable,
but I don't think we'll need it in 2.6.32.

Bjorn

> Signed-off-by: Xiaotian Feng <dfeng@...hat.com>
> ---
>  drivers/acpi/scan.c |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> index 781435d..a0102ad 100644
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> @@ -1010,6 +1010,7 @@ static void acpi_device_set_id(struct acpi_device *device,
>  	struct acpi_compatible_id_list *cid_list = NULL;
>  	const char *cid_add = NULL;
>  	acpi_status status;
> +	int free_cid_list = 0;
>  
>  	switch (type) {
>  	case ACPI_BUS_TYPE_DEVICE:
> @@ -1098,6 +1099,7 @@ static void acpi_device_set_id(struct acpi_device *device,
>  				kfree(buffer.pointer);
>  				return;
>  			} else {
> +				free_cid_list = 1;
>  				cid_list->count = 0;
>  				cid_list->size = size;
>  			}
> @@ -1124,6 +1126,8 @@ static void acpi_device_set_id(struct acpi_device *device,
>  			printk(KERN_ERR PREFIX "Memory allocation error\n");
>  	}
>  
> +	if (free_cid_list)
> +		ACPI_FREE(cid_list);
>  	kfree(buffer.pointer);
>  }
>  


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