linux-kernel - [PATCH] powerpc/nvram: use memdup

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Date:   Sat, 29 Apr 2017 09:45:13 +0800
From:   Geliang Tang <geliangtang@...il.com>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Kees Cook <keescook@...omium.org>
Cc:     Geliang Tang <geliangtang@...il.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH] powerpc/nvram: use memdup_user

Use memdup_user() helper instead of open-coding to simplify the code.

Signed-off-by: Geliang Tang <geliangtang@...il.com>
---
 arch/powerpc/kernel/nvram_64.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/arch/powerpc/kernel/nvram_64.c b/arch/powerpc/kernel/nvram_64.c
index eae61b0..496d639 100644
--- a/arch/powerpc/kernel/nvram_64.c
+++ b/arch/powerpc/kernel/nvram_64.c
@@ -792,21 +792,17 @@ static ssize_t dev_nvram_write(struct file *file, const char __user *buf,
 	count = min_t(size_t, count, size - *ppos);
 	count = min(count, PAGE_SIZE);
 
-	ret = -ENOMEM;
-	tmp = kmalloc(count, GFP_KERNEL);
-	if (!tmp)
-		goto out;
-
-	ret = -EFAULT;
-	if (copy_from_user(tmp, buf, count))
+	tmp = memdup_user(buf, count);
+	if (IS_ERR(tmp)) {
+		ret = PTR_ERR(tmp);
 		goto out;
+	}
 
 	ret = ppc_md.nvram_write(tmp, count, ppos);
 
-out:
 	kfree(tmp);
+out:
 	return ret;
-
 }
 
 static long dev_nvram_ioctl(struct file *file, unsigned int cmd,
-- 
2.9.3