linux-kernel - [PATCH] [SCSI] sg: Convert to kstrtoul_from

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Date:	Sun, 24 Jul 2011 11:13:49 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	linux-scsi@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	Doug Gilbert <dgilbert@...erlog.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexey Dobriyan <adobriyan@...il.com>
Subject: [PATCH] [SCSI] sg: Convert to kstrtoul_from_user()

Instead of open coding this function use kstrtoul_from_user()
directly.

Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
---
 drivers/scsi/sg.c |   25 +++++++++++--------------
 1 files changed, 11 insertions(+), 14 deletions(-)

diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 909ed9e..ce76d0c 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -2367,16 +2367,15 @@ static ssize_t
 sg_proc_write_adio(struct file *filp, const char __user *buffer,
 		   size_t count, loff_t *off)
 {
-	int num;
-	char buff[11];
+	int err;
+	unsigned long num;
 
 	if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 		return -EACCES;
-	num = (count < 10) ? count : 10;
-	if (copy_from_user(buff, buffer, num))
-		return -EFAULT;
-	buff[num] = '\0';
-	sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0;
+	err = kstrtoul_from_user(buffer, count, 0, &num);
+	if (err)
+		return err;
+	sg_allow_dio = num ? 1 : 0;
 	return count;
 }
 
@@ -2389,17 +2388,15 @@ static ssize_t
 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
 		     size_t count, loff_t *off)
 {
-	int num;
+	int err;
 	unsigned long k = ULONG_MAX;
-	char buff[11];
 
 	if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 		return -EACCES;
-	num = (count < 10) ? count : 10;
-	if (copy_from_user(buff, buffer, num))
-		return -EFAULT;
-	buff[num] = '\0';
-	k = simple_strtoul(buff, NULL, 10);
+
+	err = kstrtoul_from_user(buffer, count, 0, &k);
+	if (err)
+		return err;
 	if (k <= 1048576) {	/* limit "big buff" to 1 MB */
 		sg_big_buff = k;
 		return count;
-- 
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.

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