linux-kernel - [PATCH] tty: vt: use memdup

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Message-ID: <20151219184533.GA7305@platform-Vostro-3546>
Date:	Sun, 20 Dec 2015 00:15:33 +0530
From:	Rahul Pathak <rahulpathaklinux@...il.com>
To:	gregkh@...uxfoundation.org, jslaby@...e.com,
	samuel.thibault@...-lyon.org, pavel@....cz,
	dmitry.torokhov@...il.com, linux-kernel@...r.kernel.org
Subject: [PATCH] tty: vt: use memdup_user to reuse the code

Fixing coccicheck warning which recommends to use memdup_user instead
to reimplement its code, using memdup_user simplifies the code

./drivers/tty/vt/keyboard.c:1709:9-16: WARNING opportunity for memdup_user
./drivers/tty/vt/keyboard.c:1752:9-16: WARNING opportunity for memdup_user

Signed-off-by: Rahul Pathak <rahulpathaklinux@...il.com>
---
 drivers/tty/vt/keyboard.c | 28 ++++++++--------------------
 1 file changed, 8 insertions(+), 20 deletions(-)

diff --git a/drivers/tty/vt/keyboard.c b/drivers/tty/vt/keyboard.c
index 6f0336f..ec05360 100644
--- a/drivers/tty/vt/keyboard.c
+++ b/drivers/tty/vt/keyboard.c
@@ -1706,16 +1706,10 @@ int vt_do_diacrit(unsigned int cmd, void __user *udp, int perm)
 			return -EINVAL;
 
 		if (ct) {
-			dia = kmalloc(sizeof(struct kbdiacr) * ct,
-								GFP_KERNEL);
-			if (!dia)
-				return -ENOMEM;
-
-			if (copy_from_user(dia, a->kbdiacr,
-					sizeof(struct kbdiacr) * ct)) {
-				kfree(dia);
-				return -EFAULT;
-			}
+			dia = memdup_user(a->kbdiacr,
+					sizeof(struct kbdiacr) * ct);
+			if (IS_ERR(dia))
+				return PTR_ERR(dia);
 		}
 
 		spin_lock_irqsave(&kbd_event_lock, flags);
@@ -1749,16 +1743,10 @@ int vt_do_diacrit(unsigned int cmd, void __user *udp, int perm)
 			return -EINVAL;
 
 		if (ct) {
-			buf = kmalloc(ct * sizeof(struct kbdiacruc),
-								GFP_KERNEL);
-			if (buf == NULL)
-				return -ENOMEM;
-
-			if (copy_from_user(buf, a->kbdiacruc,
-					ct * sizeof(struct kbdiacruc))) {
-				kfree(buf);
-				return -EFAULT;
-			}
+			buf = memdup_user(a->kbdiacruc,
+					sizeof(struct kbdiacruc) * ct);
+			if (IS_ERR(buf))
+				return PTR_ERR(buf);
 		} 
 		spin_lock_irqsave(&kbd_event_lock, flags);
 		if (ct)
-- 
2.1.4

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