nios2: fix __get_user()

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

Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/arch/nios2/include/asm/uaccess.h b/arch/nios2/include/asm/uaccess.h
index 2b4b9e9..0ab8232 100644 (file)
--- a/arch/nios2/include/asm/uaccess.h
+++ b/arch/nios2/include/asm/uaccess.h
@@ -142,7 +142,7 @@ 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)
@@ -169,7 +169,7 @@ 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;                                                       \