linux-kernel - [PATCH 1/2] misc: xilinx_sdfec: Use memdup_user() rather than duplicating its implementation

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Message-ID: <f6f8f94b-295f-48f5-902e-3d6d4052d76b@web.de>
Date:   Tue, 5 Nov 2019 19:54:30 +0100
From:   Markus Elfring <Markus.Elfring@....de>
To:     linux-arm-kernel@...ts.infradead.org,
        Arnd Bergmann <arnd@...db.de>,
        Derek Kiernan <derek.kiernan@...inx.com>,
        Dragan Cvetic <dragan.cvetic@...inx.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michal Simek <michal.simek@...inx.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH 1/2] misc: xilinx_sdfec: Use memdup_user() rather than
 duplicating its implementation

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Tue, 5 Nov 2019 19:09:15 +0100

Reuse existing functionality from memdup_user() instead of keeping
duplicate source code.

Generated by: scripts/coccinelle/api/memdup_user.cocci

Fixes: 20ec628e8007ec75c2f884e00004f39eab6289b5 ("misc: xilinx_sdfec: Add ability to configure LDPC")
Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/misc/xilinx_sdfec.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/misc/xilinx_sdfec.c b/drivers/misc/xilinx_sdfec.c
index 11835969e982..a622fcf4954a 100644
--- a/drivers/misc/xilinx_sdfec.c
+++ b/drivers/misc/xilinx_sdfec.c
@@ -649,14 +649,9 @@ static int xsdfec_add_ldpc(struct xsdfec_dev *xsdfec, void __user *arg)
 	struct xsdfec_ldpc_params *ldpc;
 	int ret, n;

-	ldpc = kzalloc(sizeof(*ldpc), GFP_KERNEL);
-	if (!ldpc)
-		return -ENOMEM;
-
-	if (copy_from_user(ldpc, arg, sizeof(*ldpc))) {
-		ret = -EFAULT;
-		goto err_out;
-	}
+	ldpc = memdup_user(arg, sizeof(*ldpc));
+	if (IS_ERR(ldpc))
+		return PTR_ERR(ldpc);

 	if (xsdfec->config.code == XSDFEC_TURBO_CODE) {
 		ret = -EIO;
--
2.24.0