linux-kernel - [PATCH] mpt3sas: downgrade full copy_from_user to access

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Date:   Tue, 19 Sep 2017 23:11:11 -0400
From:   Meng Xu <mengxu.gatech@...il.com>
To:     sathya.prakash@...adcom.com, chaitra.basappa@...adcom.com,
        suganath-prabu.subramani@...adcom.com, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com, MPT-FusionLinux.pdl@...adcom.com,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     meng.xu@...ech.edu, sanidhya@...ech.edu, taesoo@...ech.edu,
        Meng Xu <mengxu.gatech@...il.com>
Subject: [PATCH] mpt3sas: downgrade full copy_from_user to access_ok check

Since right after the user copy, we are going to
memset(&karg, 0, sizeof(karg)), I guess an access_ok check is enough?

Signed-off-by: Meng Xu <mengxu.gatech@...il.com>
---
 drivers/scsi/mpt3sas/mpt3sas_ctl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/mpt3sas/mpt3sas_ctl.c b/drivers/scsi/mpt3sas/mpt3sas_ctl.c
index bdffb69..b363d2d 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_ctl.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_ctl.c
@@ -1065,7 +1065,7 @@ _ctl_getiocinfo(struct MPT3SAS_ADAPTER *ioc, void __user *arg)
 {
 	struct mpt3_ioctl_iocinfo karg;
 
-	if (copy_from_user(&karg, arg, sizeof(karg))) {
+	if (!access_ok(VERIFY_READ, arg, sizeof(karg))) {
 		pr_err("failure at %s:%d/%s()!\n",
 		    __FILE__, __LINE__, __func__);
 		return -EFAULT;
-- 
2.7.4