linux-kernel - Re: [PATCH] Drivers: hv: Fix bad pointer dereference in hv_get_partition

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Message-ID: <Z_NhlDk2YpptYtxe@liuwe-devbox-ubuntu-v2.tail21d00.ts.net>
Date: Mon, 7 Apr 2025 05:24:36 +0000
From: Wei Liu <wei.liu@...nel.org>
To: Nuno Das Neves <nunodasneves@...ux.microsoft.com>
Cc: linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
	wei.liu@...nel.org, kys@...rosoft.com, haiyangz@...rosoft.com,
	mhklinux@...look.com, decui@...rosoft.com
Subject: Re: [PATCH] Drivers: hv: Fix bad pointer dereference in
 hv_get_partition_id

On Tue, Apr 01, 2025 at 10:32:17AM -0700, Nuno Das Neves wrote:
> 'output' is already a pointer to the output argument, it should be
> passed directly to hv_do_hypercall() without the '&' operator.
> 
> Signed-off-by: Nuno Das Neves <nunodasneves@...ux.microsoft.com>

Applied to hyperv-fixes. Thanks.

> ---
> This patch is a fixup for:
> e96204e5e96e hyperv: Move hv_current_partition_id to arch-generic code
> 
>  drivers/hv/hv_common.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c
> index b3b11be11650..a7d7494feaca 100644
> --- a/drivers/hv/hv_common.c
> +++ b/drivers/hv/hv_common.c
> @@ -307,7 +307,7 @@ void __init hv_get_partition_id(void)
>  
>  	local_irq_save(flags);
>  	output = *this_cpu_ptr(hyperv_pcpu_input_arg);
> -	status = hv_do_hypercall(HVCALL_GET_PARTITION_ID, NULL, &output);
> +	status = hv_do_hypercall(HVCALL_GET_PARTITION_ID, NULL, output);
>  	pt_id = output->partition_id;
>  	local_irq_restore(flags);
>  
> -- 
> 2.34.1
>