linux-kernel - [PATCH 3.12 115/119] sparc32: fix copy_from

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Message-Id: <0ed3b0d5028684292100726687b725d541e5a34e.1475144721.git.jslaby@suse.cz>
Date:   Thu, 29 Sep 2016 12:25:51 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 115/119] sparc32: fix copy_from_user()

From: Al Viro <viro@...iv.linux.org.uk>

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

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

commit 917400cecb4b52b5cde5417348322bb9c8272fa6 upstream.

Acked-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 arch/sparc/include/asm/uaccess_32.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/sparc/include/asm/uaccess_32.h b/arch/sparc/include/asm/uaccess_32.h
index 53a28dd59f59..01f602858de1 100644
--- a/arch/sparc/include/asm/uaccess_32.h
+++ b/arch/sparc/include/asm/uaccess_32.h
@@ -265,8 +265,10 @@ static inline unsigned long copy_from_user(void *to, const void __user *from, un
 {
 	if (n && __access_ok((unsigned long) from, n))
 		return __copy_user((__force void __user *) to, from, n);
-	else
+	else {
+		memset(to, 0, n);
 		return n;
+	}
 }
 
 static inline unsigned long __copy_from_user(void *to, const void __user *from, unsigned long n)
-- 
2.10.0