[PATCH 4.19 009/267] arch/openrisc: Fix issues with access_ok()

[Greg Kroah-Hartman]

From: Stafford Horne <shorne@xxxxxxxxx>

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@xxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Reported-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Stafford Horne <shorne@xxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Miles Chen <miles.chen@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 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