linux-kernel - [PATCH 4/4] vmci_host: get rid of pointless access

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Message-Id: <20200509234557.1124086-20-viro@ZenIV.linux.org.uk>
Date:   Sun, 10 May 2020 00:45:57 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     linux-kernel@...r.kernel.org
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 4/4] vmci_host: get rid of pointless access_ok()

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

get_user_pages_fast() doesn't need the caller to check that.
NB: reachable only from ioctl(2) and only under USER_DS

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 drivers/misc/vmw_vmci/vmci_host.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/misc/vmw_vmci/vmci_host.c b/drivers/misc/vmw_vmci/vmci_host.c
index ce16d6b99295..2d8328d928d5 100644
--- a/drivers/misc/vmw_vmci/vmci_host.c
+++ b/drivers/misc/vmw_vmci/vmci_host.c
@@ -233,8 +233,6 @@ static int vmci_host_setup_notify(struct vmci_ctx *context,
 	 * about the size.
 	 */
 	BUILD_BUG_ON(sizeof(bool) != sizeof(u8));
-	if (!access_ok((void __user *)uva, sizeof(u8)))
-		return VMCI_ERROR_GENERIC;
 
 	/*
 	 * Lock physical page backing a given user VA.
-- 
2.11.0