linux-kernel - RE: [PATCH V4 linux-next RESEND 2] bfa: replace 2 kzalloc/copy_from_user by memdup

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Date:	Mon, 17 Nov 2014 05:11:46 +0000
From:	Anil Gurumurthy <Anil.Gurumurthy@...gic.com>
To:	Fabian Frederick <fabf@...net.be>,
	linux-kernel <linux-kernel@...r.kernel.org>
CC:	Joe Perches <joe@...ches.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Sudarsana Kalluru <Sudarsana.Kalluru@...gic.com>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	linux-scsi <linux-scsi@...r.kernel.org>
Subject: RE: [PATCH V4 linux-next RESEND 2] bfa: replace 2
 kzalloc/copy_from_user by memdup_user

Patch looks good. 
Thanks!
Acked-by: Anil Gurumurthy <anil.gurumurthy@...gic.com>

-----Original Message-----
From: Fabian Frederick [mailto:fabf@...net.be] 
Sent: 15 November 2014 00:20
To: linux-kernel
Cc: Joe Perches; Greg Kroah-Hartman; One Thousand Gnomes; Fabian Frederick; Anil Gurumurthy; Sudarsana Kalluru; James E.J. Bottomley; linux-scsi
Subject: [PATCH V4 linux-next RESEND 2] bfa: replace 2 kzalloc/copy_from_user by memdup_user

This patch also removes unnecessary printk(KERN_INFO

Signed-off-by: Fabian Frederick <fabf@...net.be>
---
V4: remove blank line after memdup_user
V3: memdup_user first argument is already void __user * (thanks to Joe Perches)
    typo in title
V2: Remove printk(KERN_INFO (suggested by Alan)

 drivers/scsi/bfa/bfad_debugfs.c | 30 ++++++------------------------
 1 file changed, 6 insertions(+), 24 deletions(-)

diff --git a/drivers/scsi/bfa/bfad_debugfs.c b/drivers/scsi/bfa/bfad_debugfs.c index 8e83d04..74a307c 100644
--- a/drivers/scsi/bfa/bfad_debugfs.c
+++ b/drivers/scsi/bfa/bfad_debugfs.c
@@ -260,18 +260,9 @@ bfad_debugfs_write_regrd(struct file *file, const char __user *buf,
 	unsigned long flags;
 	void *kern_buf;
 
-	kern_buf = kzalloc(nbytes, GFP_KERNEL);
-
-	if (!kern_buf) {
-		printk(KERN_INFO "bfad[%d]: Failed to allocate buffer\n",
-				bfad->inst_no);
-		return -ENOMEM;
-	}
-
-	if (copy_from_user(kern_buf, (void  __user *)buf, nbytes)) {
-		kfree(kern_buf);
-		return -ENOMEM;
-	}
+	kern_buf = memdup_user(buf, nbytes);
+	if (IS_ERR(kern_buf))
+		return PTR_ERR(kern_buf);
 
 	rc = sscanf(kern_buf, "%x:%x", &addr, &len);
 	if (rc < 2) {
@@ -336,18 +327,9 @@ bfad_debugfs_write_regwr(struct file *file, const char __user *buf,
 	unsigned long flags;
 	void *kern_buf;
 
-	kern_buf = kzalloc(nbytes, GFP_KERNEL);
-
-	if (!kern_buf) {
-		printk(KERN_INFO "bfad[%d]: Failed to allocate buffer\n",
-				bfad->inst_no);
-		return -ENOMEM;
-	}
-
-	if (copy_from_user(kern_buf, (void  __user *)buf, nbytes)) {
-		kfree(kern_buf);
-		return -ENOMEM;
-	}
+	kern_buf = memdup_user(buf, nbytes);
+	if (IS_ERR(kern_buf))
+		return PTR_ERR(kern_buf);
 
 	rc = sscanf(kern_buf, "%x:%x", &addr, &val);
 	if (rc < 2) {
--
1.9.3

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