asm-generic: make copy_from_user() zero the destination properly

[cascardo/linux.git] / include / asm-generic / uaccess.h

diff --git a/include/asm-generic/uaccess.h b/include/asm-generic/uaccess.h
index 1bfa602..04e21a4 100644 (file)
--- a/include/asm-generic/uaccess.h
+++ b/include/asm-generic/uaccess.h
@@ -257,11 +257,13 @@ extern int __get_user_bad(void) __attribute__((noreturn));
 static inline long copy_from_user(void *to,
                const void __user * from, unsigned long n)
 {
+       unsigned long res = n;
        might_fault();
-       if (access_ok(VERIFY_READ, from, n))
-               return __copy_from_user(to, from, n);
-       else
-               return n;
+       if (likely(access_ok(VERIFY_READ, from, n)))
+               res = __copy_from_user(to, from, n);
+       if (unlikely(res))
+               memset(to + (n - res), 0, res);
+       return res;
 }
 
 static inline long copy_to_user(void __user *to,