mn10300: copy_from_user() should zero on access_ok() failure...

commit ae7cc577ec2a4a6151c9e928fd1f595d953ecef1 upstream.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
[bwh: Backported to 3.2: include <linux/string.h> to get declaration of memset()]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/arch/mn10300/lib/usercopy.c b/arch/mn10300/lib/usercopy.c
index 7826e6c..a29c5dc 100644 (file)
--- a/arch/mn10300/lib/usercopy.c
+++ b/arch/mn10300/lib/usercopy.c
@@ -9,7 +9,8 @@
  * as published by the Free Software Foundation; either version
  * 2 of the Licence, or (at your option) any later version.
  */
-#include <asm/uaccess.h>
+#include <linux/string.h>
+#include <linux/uaccess.h>
 
 unsigned long
 __generic_copy_to_user(void *to, const void *from, unsigned long n)
@@ -24,6 +25,8 @@ __generic_copy_from_user(void *to, const void *from, unsigned long n)
 {
        if (access_ok(VERIFY_READ, from, n))
                __copy_user_zeroing(to, from, n);
+       else
+               memset(to, 0, n);
        return n;
 }