linux-kernel - [PATCH] ptp: use memdup

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1463746862-23815-1-git-send-email-falakreyaz@gmail.com>
Date:	Fri, 20 May 2016 17:51:02 +0530
From:	Muhammad Falak R Wani <falakreyaz@...il.com>
To:	Richard Cochran <richardcochran@...il.com>
Cc:	netdev@...r.kernel.org (open list:PTP HARDWARE CLOCK SUPPORT),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] ptp: use memdup_user().

Use memdup_user to duplicate a memory region from user-space to
kernel-space, instead of open coding using kmalloc & copy_from_user.

Signed-off-by: Muhammad Falak R Wani <falakreyaz@...il.com>
---
 drivers/ptp/ptp_chardev.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c
index 579fd65..0b1ac6b 100644
--- a/drivers/ptp/ptp_chardev.c
+++ b/drivers/ptp/ptp_chardev.c
@@ -208,14 +208,9 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
 		break;
 
 	case PTP_SYS_OFFSET:
-		sysoff = kmalloc(sizeof(*sysoff), GFP_KERNEL);
-		if (!sysoff) {
-			err = -ENOMEM;
-			break;
-		}
-		if (copy_from_user(sysoff, (void __user *)arg,
-				   sizeof(*sysoff))) {
-			err = -EFAULT;
+		sysoff = memdup_user((void __user *)arg, sizeof(*sysoff));
+		if (IS_ERR(sysoff)) {
+			err = PTR_ERR(sysoff);
 			break;
 		}
 		if (sysoff->n_samples > PTP_MAX_SAMPLES) {
-- 
1.9.1