# Pastebin h9KhBy3L
commit 562507c55da86e6cac4beacea128c36db8c37cc4
Author: Arnd Bergmann <arnd@arndb.de>
Date:   Mon Feb 14 15:48:14 2022 +0100

    nds32: fix access_ok() checks in get/put_user
    
    The get_user()/put_user() functions are meant to check for
    access_ok(), while the __get_user()/__put_user() functions
    don't.
    
    This broke in 4.19 for nds32, when it gained an extraneous
    check in __get_user(), but lost the check it needs in
    __put_user().
    
    Fixes: 487913ab18c2 ("nds32: Extract the checking and getting pointer to a macro")
    Cc: stable@vger.kernel.org @ v4.19+
    Signed-off-by: Arnd Bergmann <arnd@arndb.de>

diff --git a/arch/nds32/include/asm/uaccess.h b/arch/nds32/include/asm/uaccess.h
index 9dffd30d87b5..377548d4451a 100644
--- a/arch/nds32/include/asm/uaccess.h
+++ b/arch/nds32/include/asm/uaccess.h
@@ -54,9 +54,7 @@ extern int fixup_exception(struct pt_regs *regs);
  * versions are void (ie, don't return a value as such).
  */
 
-#define get_user	__get_user					\
-
-#define __get_user(x, ptr)						\
+#define get_user(x, ptr)						\
 ({									\
 	long __gu_err = 0;						\
 	__get_user_check((x), (ptr), __gu_err);				\
@@ -69,6 +67,14 @@ extern int fixup_exception(struct pt_regs *regs);
 	(void)0;							\
 })
 
+#define __get_user(x, ptr)						\
+({									\
+	long __gu_err = 0;						\
+	const __typeof__(*(ptr)) __user *__p = (ptr);			\
+	__get_user_err((x), __p, (__gu_err));				\
+	__gu_err;							\
+})
+
 #define __get_user_check(x, ptr, err)					\
 ({									\
 	const __typeof__(*(ptr)) __user *__p = (ptr);			\
@@ -149,12 +155,18 @@ do {									\
 		: "r"(addr), "i"(-EFAULT)				\
 		: "cc")
 
-#define put_user	__put_user					\
+#define put_user(x, ptr)						\
+({									\
+	long __pu_err = 0;						\
+	__put_user_check((x), (ptr), __pu_err);				\
+	__pu_err;							\
+})
 
 #define __put_user(x, ptr)						\
 ({									\
 	long __pu_err = 0;						\
-	__put_user_err((x), (ptr), __pu_err);				\
+	__typeof__(*(ptr)) __user *__p = (ptr);				\
+	__put_user_err((x), __p, __pu_err);				\
 	__pu_err;							\
 })