From b9f705758a4faaf86532bddf6ea3c50d6778ba42 Mon Sep 17 00:00:00 2001 From: Chris Metcalf Date: Tue, 13 Jan 2015 14:41:20 -0500 Subject: [PATCH] tile: enable sparse checks for get/put_user Add an extra intermediate variable to __get_user and __put_user to give sparse an opportunity to detect mismatches. Reviewed-by: Michael S. Tsirkin Signed-off-by: Chris Metcalf --- arch/tile/include/asm/uaccess.h | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) diff --git a/arch/tile/include/asm/uaccess.h b/arch/tile/include/asm/uaccess.h index b81b24a8489b..f41cb53cf645 100644 --- a/arch/tile/include/asm/uaccess.h +++ b/arch/tile/include/asm/uaccess.h @@ -210,14 +210,16 @@ extern int __get_user_bad(void) #define __get_user(x, ptr) \ ({ \ int __ret; \ + typeof(x) _x; \ __chk_user_ptr(ptr); \ switch (sizeof(*(ptr))) { \ - case 1: __get_user_1(x, ptr, __ret); break; \ - case 2: __get_user_2(x, ptr, __ret); break; \ - case 4: __get_user_4(x, ptr, __ret); break; \ - case 8: __get_user_8(x, ptr, __ret); break; \ + case 1: __get_user_1(_x, ptr, __ret); break; \ + case 2: __get_user_2(_x, ptr, __ret); break; \ + case 4: __get_user_4(_x, ptr, __ret); break; \ + case 8: __get_user_8(_x, ptr, __ret); break; \ default: __ret = __get_user_bad(); break; \ } \ + (x) = (typeof(*(ptr))) _x; \ __ret; \ }) @@ -289,12 +291,13 @@ extern int __put_user_bad(void) #define __put_user(x, ptr) \ ({ \ int __ret; \ + typeof(*(ptr)) _x = (x); \ __chk_user_ptr(ptr); \ switch (sizeof(*(ptr))) { \ - case 1: __put_user_1(x, ptr, __ret); break; \ - case 2: __put_user_2(x, ptr, __ret); break; \ - case 4: __put_user_4(x, ptr, __ret); break; \ - case 8: __put_user_8(x, ptr, __ret); break; \ + case 1: __put_user_1(_x, ptr, __ret); break; \ + case 2: __put_user_2(_x, ptr, __ret); break; \ + case 4: __put_user_4(_x, ptr, __ret); break; \ + case 8: __put_user_8(_x, ptr, __ret); break; \ default: __ret = __put_user_bad(); break; \ } \ __ret; \