linux-kernel - [RFC PATCH 2/8] sg_new_write(): replace access_ok() + __copy_from_user() with copy_from

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Message-Id: <20191017193925.25539-2-viro@ZenIV.linux.org.uk>
Date:   Thu, 17 Oct 2019 20:39:19 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     linux-scsi@...r.kernel.org
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>
Subject: [RFC PATCH 2/8] sg_new_write(): replace access_ok() + __copy_from_user() with copy_from_user()

From: Al Viro <viro@...iv.linux.org.uk>

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 drivers/scsi/sg.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 634460421ce4..026628aa556d 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -763,11 +763,7 @@ sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
 		sg_remove_request(sfp, srp);
 		return -EMSGSIZE;
 	}
-	if (!access_ok(hp->cmdp, hp->cmd_len)) {
-		sg_remove_request(sfp, srp);
-		return -EFAULT;	/* protects following copy_from_user()s + get_user()s */
-	}
-	if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
+	if (copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
 		sg_remove_request(sfp, srp);
 		return -EFAULT;
 	}
-- 
2.11.0