[PATCH 4.14 005/190] arch/openrisc: Fix issues with access_ok()

Greg Kroah-Hartman
2020-06-19T16:40:10Z

From: Stafford Horne <shorne@gmail.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@roeck-us.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Stafford Horne <shorne@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Miles Chen <miles.chen@mediatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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