[PATCH] isdn/hysdn: Convert to kstrtoul_from_user

[PATCH] isdn/hysdn: Convert to kstrtoul_from_user

[Peter Huewe]

This patch replaces the code for getting an number from a
userspace buffer by a simple call to kstroul_from_user.
This makes it easier to read and less error prone.

Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
---
 drivers/isdn/hysdn/hysdn_proclog.c |   10 +---------
 1 files changed, 1 insertions(+), 9 deletions(-)

diff --git a/drivers/isdn/hysdn/hysdn_proclog.c b/drivers/isdn/hysdn/hysdn_proclog.c
index ba91333..88e4f0e 100644
--- a/drivers/isdn/hysdn/hysdn_proclog.c
+++ b/drivers/isdn/hysdn/hysdn_proclog.c
@@ -156,17 +156,9 @@ static ssize_t
 hysdn_log_write(struct file *file, const char __user *buf, size_t count, loff_t *off)
 {
 	int rc;
-	unsigned char valbuf[128];
 	hysdn_card *card = file->private_data;
 
-	if (count > (sizeof(valbuf) - 1))
-		count = sizeof(valbuf) - 1;	/* limit length */
-	if (copy_from_user(valbuf, buf, count))
-		return (-EFAULT);	/* copy failed */
-
-	valbuf[count] = 0;	/* terminating 0 */
-
-	rc = kstrtoul(valbuf, 0, &card->debug_flags);
+	rc = kstrtoul_from_user(buf, count, 0, &card->debug_flags);
 	if (rc < 0)
 		return rc;
 	hysdn_addlog(card, "debug set to 0x%lx", card->debug_flags);
-- 
1.7.3.4

Re: [PATCH] isdn/hysdn: Convert to kstrtoul_from_user

[David Miller]

From: Peter Huewe <peterhuewe@gmx.de>
Date: Sun, 15 Apr 2012 01:42:59 +0200

> This patch replaces the code for getting an number from a
> userspace buffer by a simple call to kstroul_from_user.
> This makes it easier to read and less error prone.
> 
> Signed-off-by: Peter Huewe <peterhuewe@gmx.de>

Applied to net-next, thanks a lot.