linux-kernel - [PATCH 4.14 005/190] arch/openrisc: Fix issues with access

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Date:   Fri, 19 Jun 2020 16:30:50 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Stafford Horne <shorne@...il.com>,
        Miles Chen <miles.chen@...iatek.com>
Subject: [PATCH 4.14 005/190] arch/openrisc: Fix issues with access_ok()

From: Stafford Horne <shorne@...il.com>

commit 9cb2feb4d21d97386eb25c7b67e2793efcc1e70a upstream.

The commit 594cc251fdd0 ("make 'user_access_begin()' do 'access_ok()'")
exposed incorrect implementations of access_ok() macro in several
architectures.  This change fixes 2 issues found in OpenRISC.

OpenRISC was not properly using parenthesis for arguments and also using
arguments twice.  This patch fixes those 2 issues.

I test booted this patch with v5.0-rc1 on qemu and it's working fine.

Cc: Guenter Roeck <linux@...ck-us.net>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Reported-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Stafford Horne <shorne@...il.com>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Miles Chen <miles.chen@...iatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/openrisc/include/asm/uaccess.h |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/arch/openrisc/include/asm/uaccess.h
+++ b/arch/openrisc/include/asm/uaccess.h
@@ -58,8 +58,12 @@
 /* Ensure that addr is below task's addr_limit */
 #define __addr_ok(addr) ((unsigned long) addr < get_fs())
 
-#define access_ok(type, addr, size) \
-	__range_ok((unsigned long)addr, (unsigned long)size)
+#define access_ok(type, addr, size)						\
+({ 									\
+	unsigned long __ao_addr = (unsigned long)(addr);		\
+	unsigned long __ao_size = (unsigned long)(size);		\
+	__range_ok(__ao_addr, __ao_size);				\
+})
 
 /*
  * These are the main single-value transfer routines.  They automatically