linux-kernel - [PATCH v2] asm-generic: {get,put}_user ptr argument evaluate only 1 time

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Message-Id: <1437056199-2326-1-git-send-email-ysato@users.sourceforge.jp>
Date:	Thu, 16 Jul 2015 23:16:39 +0900
From:	Yoshinori Sato <ysato@...rs.sourceforge.jp>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] asm-generic: {get,put}_user ptr argument evaluate only 1 time

Current implemantation ptr argument evaluate 2 times.
It'll be an unexpected result.

Changes v2:
Add parenthesis to argument "x".

Signed-off-by: Yoshinori Sato <ysato@...rs.sourceforge.jp>
---
 include/asm-generic/uaccess.h | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/include/asm-generic/uaccess.h b/include/asm-generic/uaccess.h
index 72d8803..ba6ab80 100644
--- a/include/asm-generic/uaccess.h
+++ b/include/asm-generic/uaccess.h
@@ -163,9 +163,10 @@ static inline __must_check long __copy_to_user(void __user *to,
 
 #define put_user(x, ptr)					\
 ({								\
+	__typeof__((ptr)) __p = (ptr);				\
 	might_fault();						\
-	access_ok(VERIFY_WRITE, ptr, sizeof(*ptr)) ?		\
-		__put_user(x, ptr) :				\
+	access_ok(VERIFY_WRITE, __p, sizeof(*__p)) ?		\
+		__put_user((x), __p) :				\
 		-EFAULT;					\
 })
 
@@ -225,9 +226,10 @@ extern int __put_user_bad(void) __attribute__((noreturn));
 
 #define get_user(x, ptr)					\
 ({								\
+	__typeof__((ptr)) __p = (ptr);				\
 	might_fault();						\
-	access_ok(VERIFY_READ, ptr, sizeof(*ptr)) ?		\
-		__get_user(x, ptr) :				\
+	access_ok(VERIFY_READ, __p, sizeof(*__p)) ?		\
+		__get_user((x), __p) :				\
 		-EFAULT;					\
 })
 
-- 
2.1.4

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