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

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Date:   Mon, 5 Mar 2018 14:10:20 +0100
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     linux-crypto@...r.kernel.org,
        Brijesh Singh <brijesh.singh@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Gary Hook <gary.hook@....com>,
        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: [PATCH] crypto: ccp: Use memdup_user() rather than duplicating its
 implementation

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>
---
 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);
 
-- 
2.16.2