linux-kernel - [PATCH 3.12 119/119] openrisc: fix the fix of copy_from

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Message-Id: <f0cbef458ac3d7575397295568507a9b45d5a858.1475144721.git.jslaby@suse.cz>
Date:   Thu, 29 Sep 2016 12:25:55 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
        Al Viro <viro@...iv.linux.org.uk>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 119/119] openrisc: fix the fix of copy_from_user()

From: Guenter Roeck <linux@...ck-us.net>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

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@...iv.linux.org.uk>
Fixes: acb2505d0119 ("openrisc: fix copy_from_user()")
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 arch/openrisc/include/asm/uaccess.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/openrisc/include/asm/uaccess.h b/arch/openrisc/include/asm/uaccess.h
index 908c0904bdd6..d441480a4af4 100644
--- a/arch/openrisc/include/asm/uaccess.h
+++ b/arch/openrisc/include/asm/uaccess.h
@@ -276,7 +276,7 @@ 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;
-- 
2.10.0