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Message-ID: <762b7c68-5ae3-b27e-1018-b930de61b99e@redhat.com>
Date: Wed, 23 Nov 2022 09:41:06 +0100
From: Eric Auger <eric.auger@...hat.com>
To: Hanjun Guo <guohanjun@...wei.com>,
Alex Williamson <alex.williamson@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
Sinan Kaya <okaya@...eaurora.org>
Subject: Re: [PATCH] vfio/platform: Remove the ACPI buffer memory to fix
memory leak
Hi,
On 11/22/22 12:29, Hanjun Guo wrote:
> The ACPI buffer memory (buffer.pointer) returned by acpi_evaluate_object()
> is not used after the call of _RST method, so it leads to memory leak.
>
> For the calling of ACPI _RST method, we don't need to pass a buffer
> for acpi_evaluate_object(), we can just pass NULL and remove the ACPI
> buffer memory in vfio_platform_acpi_call_reset(), then we don't need to
> free the memory and no memory leak.
>
> Fixes: d30daa33ec1d ("vfio: platform: call _RST method when using ACPI")
> Signed-off-by: Hanjun Guo <guohanjun@...wei.com>
> ---
> drivers/vfio/platform/vfio_platform_common.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
> index 55dc4f4..1a0a238 100644
> --- a/drivers/vfio/platform/vfio_platform_common.c
> +++ b/drivers/vfio/platform/vfio_platform_common.c
> @@ -72,12 +72,11 @@ static int vfio_platform_acpi_call_reset(struct vfio_platform_device *vdev,
> const char **extra_dbg)
> {
> #ifdef CONFIG_ACPI
> - struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
> struct device *dev = vdev->device;
> acpi_handle handle = ACPI_HANDLE(dev);
> acpi_status acpi_ret;
>
> - acpi_ret = acpi_evaluate_object(handle, "_RST", NULL, &buffer);
> + acpi_ret = acpi_evaluate_object(handle, "_RST", NULL, NULL);
> if (ACPI_FAILURE(acpi_ret)) {
> if (extra_dbg)
> *extra_dbg = acpi_format_exception(acpi_ret);
Reviewed-by: Eric Auger <eric.auger@...hat.com>
Thank you for the fix!
Eric
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