From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 20 Aug 2016 20:39:01 +0000 (-0400)
Subject: nios2: fix __get_user()
X-Git-Tag: firefly_0821_release~176^2~4^2~28^2~25
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=ba45b3ff27474fd540d6efa66c62f7d53c17b073;p=firefly-linux-kernel-4.4.55.git

nios2: fix __get_user()

commit 2e29f50ad5e23db37dde9be71410d95d50241ecd upstream.

a) should not leave crap on fault
b) should _not_ require access_ok() in any cases.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/arch/nios2/include/asm/uaccess.h b/arch/nios2/include/asm/uaccess.h
index caa51ff85a3c..ebac5bbfc340 100644
--- a/arch/nios2/include/asm/uaccess.h
+++ b/arch/nios2/include/asm/uaccess.h
@@ -139,7 +139,7 @@ extern long strnlen_user(const char __user *s, long n);
 
 #define __get_user_unknown(val, size, ptr, err) do {			\
 	err = 0;							\
-	if (copy_from_user(&(val), ptr, size)) {			\
+	if (__copy_from_user(&(val), ptr, size)) {			\
 		err = -EFAULT;						\
 	}								\
 	} while (0)
@@ -166,7 +166,7 @@ do {									\
 	({								\
 	long __gu_err = -EFAULT;					\
 	const __typeof__(*(ptr)) __user *__gu_ptr = (ptr);		\
-	unsigned long __gu_val;						\
+	unsigned long __gu_val = 0;					\
 	__get_user_common(__gu_val, sizeof(*(ptr)), __gu_ptr, __gu_err);\
 	(x) = (__force __typeof__(x))__gu_val;				\
 	__gu_err;							\