linux-kernel - [PATCH] staging: lustre: replace kzalloc with copy_from_user with memdup

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Date:	Tue, 31 Mar 2015 15:10:33 +0000
From:	"Dhere, Chaitanya (C.)" <cvijaydh@...teon.com>
To:	"oleg.drokin@...el.com" <oleg.drokin@...el.com>,
	"andreas.dilger@...el.com" <andreas.dilger@...el.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
	"jinshan.xiong@...el.com" <jinshan.xiong@...el.com>,
	"aybuke.147@...il.com" <aybuke.147@...il.com>,
	"john.hammond@...el.com" <john.hammond@...el.com>,
	"Julia.Lawall@...6.fr" <Julia.Lawall@...6.fr>
CC:	"HPDD-discuss@...ts.01.org" <HPDD-discuss@...ts.01.org>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] staging: lustre: replace kzalloc with copy_from_user with
 memdup_user

This patch replaces kzalloc and copy_from_user with memdup_user call
This change was detected with coccinelle tool

Signed-off-by: Chaitanya Dhere <cvijaydh@...teon.com>
---
 drivers/staging/lustre/lustre/llite/file.c |   11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/staging/lustre/lustre/llite/file.c b/drivers/staging/lustre/lustre/llite/file.c
index 85e74d1..85b5567 100644
--- a/drivers/staging/lustre/lustre/llite/file.c
+++ b/drivers/staging/lustre/lustre/llite/file.c
@@ -2368,14 +2368,9 @@ ll_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 		struct hsm_state_set	*hss;
 		int			 rc;
 
-		hss = kzalloc(sizeof(*hss), GFP_NOFS);
-		if (!hss)
-			return -ENOMEM;
-
-		if (copy_from_user(hss, (char *)arg, sizeof(*hss))) {
-			OBD_FREE_PTR(hss);
-			return -EFAULT;
-		}
+		hss = memdup_user((char *)arg, sizeof(*hss));
+		if (IS_ERR(hss))
+			return PTR_ERR(hss);
 
 		rc = ll_hsm_state_set(inode, hss);
 
-- 
1.7.9.5
--
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