[PATCH -next] misc: xilinx_sdfec: Use memdup_user() as a cleanup

From: Zou Wei <zou_wei@huawei.com>
To: <derek.kiernan@xilinx.com>, <dragan.cvetic@xilinx.com>,
	<arnd@arndb.de>, <gregkh@linuxfoundation.org>,
	<michal.simek@xilinx.com>
Cc: Zou Wei <zou_wei@huawei.com>,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH -next] misc: xilinx_sdfec: Use memdup_user() as a cleanup
Date: Wed, 22 Apr 2020 10:58:50 +0800	[thread overview]
Message-ID: <1587524330-119776-1-git-send-email-zou_wei@huawei.com> (raw)

Fix coccicheck warning which recommends to use memdup_user().

This patch fixes the following coccicheck warnings:

drivers/misc/xilinx_sdfec.c:652:8-15: WARNING opportunity for memdup_user

Fixes: 20ec628e8007 ("misc: xilinx_sdfec: Add ability to configure LDPC")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zou Wei <zou_wei@huawei.com>
---
 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 71bbaa5..7a75894 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;
-- 
2.6.2


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