linux-kernel - Re: [PATCH] platform/x86/amd/pmf: Fix memory leak in amd_pmf_get_pb

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Date: Tue, 23 Jan 2024 20:07:53 +0530
From: Shyam Sundar S K <Shyam-sundar.S-k@....com>
To: Cong Liu <liucong2@...inos.cn>, Hans de Goede <hdegoede@...hat.com>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] platform/x86/amd/pmf: Fix memory leak in
 amd_pmf_get_pb_data()

Hi,

On 1/23/2024 06:41, Cong Liu wrote:
> amd_pmf_get_pb_data() will allocate memory for the policy buffer,
> but does not free it if copy_from_user() fails. This leads to a memory
> leak.

Thank you for the fix and looks good to me (just a valid Fixes tag is
missing.)

Fixes: 10817f28e533 ("platform/x86/amd/pmf: Add capability to sideload
of policy binary")
Reviewed-by: Shyam Sundar S K <Shyam-sundar.S-k@....com>

Thanks,
Shyam

> 
> Signed-off-by: Cong Liu <liucong2@...inos.cn>
> ---
>  drivers/platform/x86/amd/pmf/tee-if.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/platform/x86/amd/pmf/tee-if.c b/drivers/platform/x86/amd/pmf/tee-if.c
> index 502ce93d5cdd..f8c0177afb0d 100644
> --- a/drivers/platform/x86/amd/pmf/tee-if.c
> +++ b/drivers/platform/x86/amd/pmf/tee-if.c
> @@ -298,8 +298,10 @@ static ssize_t amd_pmf_get_pb_data(struct file *filp, const char __user *buf,
>  	if (!new_policy_buf)
>  		return -ENOMEM;
>  
> -	if (copy_from_user(new_policy_buf, buf, length))
> +	if (copy_from_user(new_policy_buf, buf, length)) {
> +		kfree(new_policy_buf);
>  		return -EFAULT;
> +	}
>  
>  	kfree(dev->policy_buf);
>  	dev->policy_buf = new_policy_buf;