From: Guenter Roeck <linux@roeck-us.net>
Date: Sat, 17 Sep 2016 19:57:24 +0000 (-0700)
Subject: openrisc: fix the fix of copy_from_user()
X-Git-Tag: v3.2.84~22
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=commitdiff_plain;h=801cbc88bdfa268dcd888163e2983c802cbc853a

openrisc: fix the fix of copy_from_user()

commit 8e4b72054f554967827e18be1de0e8122e6efc04 upstream.

Since commit acb2505d0119 ("openrisc: fix copy_from_user()"),
copy_from_user() returns the number of bytes requested, not the
number of bytes not copied.

Cc: Al Viro <viro@zeniv.linux.org.uk>
Fixes: acb2505d0119 ("openrisc: fix copy_from_user()")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

diff --git a/arch/openrisc/include/asm/uaccess.h b/arch/openrisc/include/asm/uaccess.h
index 0bcc64803dc1..1acfe52f6929 100644
--- a/arch/openrisc/include/asm/uaccess.h
+++ b/arch/openrisc/include/asm/uaccess.h
@@ -277,7 +277,7 @@ copy_from_user(void *to, const void *from, unsigned long n)
 	unsigned long res = n;
 
 	if (likely(access_ok(VERIFY_READ, from, n)))
-		n = __copy_tofrom_user(to, from, n);
+		res = __copy_tofrom_user(to, from, n);
 	if (unlikely(res))
 		memset(to + (n - res), 0, res);
 	return res;