linux-kernel - Re: [PATCH] crypto: ccp: Use memdup_user() rather than duplicating its implementation

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Date:   Mon, 5 Mar 2018 13:41:02 -0600
From:   Gary R Hook <gary.hook@....com>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>,
        linux-crypto@...r.kernel.org,
        Brijesh Singh <brijesh.singh@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Tom Lendacky <thomas.lendacky@....com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org, kvm@...r.kernel.org,
        Borislav Petkov <bp@...e.de>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>
Subject: Re: [PATCH] crypto: ccp: Use memdup_user() rather than duplicating
 its implementation

On 03/05/2018 07:10 AM, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Mon, 5 Mar 2018 13:50:13 +0100
> 
> Reuse existing functionality from memdup_user() instead of keeping
> duplicate source code.
> 
> This issue was detected by using the Coccinelle software.
> 
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>

Acked-by: Gary R Hook <gary.hook@....com>

> ---
>   drivers/crypto/ccp/psp-dev.c | 15 +--------------
>   1 file changed, 1 insertion(+), 14 deletions(-)
> 
> diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c
> index fcfa5b1eae61..8255258cd040 100644
> --- a/drivers/crypto/ccp/psp-dev.c
> +++ b/drivers/crypto/ccp/psp-dev.c
> @@ -367,8 +367,6 @@ static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp)
>   
>   void *psp_copy_user_blob(u64 __user uaddr, u32 len)
>   {
> -	void *data;
> -
>   	if (!uaddr || !len)
>   		return ERR_PTR(-EINVAL);
>   
> @@ -376,18 +374,7 @@ void *psp_copy_user_blob(u64 __user uaddr, u32 len)
>   	if (len > SEV_FW_BLOB_MAX_SIZE)
>   		return ERR_PTR(-EINVAL);
>   
> -	data = kmalloc(len, GFP_KERNEL);
> -	if (!data)
> -		return ERR_PTR(-ENOMEM);
> -
> -	if (copy_from_user(data, (void __user *)(uintptr_t)uaddr, len))
> -		goto e_free;
> -
> -	return data;
> -
> -e_free:
> -	kfree(data);
> -	return ERR_PTR(-EFAULT);
> +	return memdup_user((void __user *)(uintptr_t)uaddr, len);
>   }
>   EXPORT_SYMBOL_GPL(psp_copy_user_blob);
>   
>