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Message-Id: <d7a9ffa0e56b2d5dd24fb9949c4d045111515aa5.1475144721.git.jslaby@suse.cz>
Date: Thu, 29 Sep 2016 12:25:40 +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 3.12 104/119] blackfin: 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 8f035983dd826d7e04f67b28acf8e2f08c347e41 upstream.
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
arch/blackfin/include/asm/uaccess.h | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/arch/blackfin/include/asm/uaccess.h b/arch/blackfin/include/asm/uaccess.h
index 57701c3b8a59..a992a788409c 100644
--- a/arch/blackfin/include/asm/uaccess.h
+++ b/arch/blackfin/include/asm/uaccess.h
@@ -177,11 +177,12 @@ static inline int bad_user_access_length(void)
static inline unsigned long __must_check
copy_from_user(void *to, const void __user *from, unsigned long n)
{
- if (access_ok(VERIFY_READ, from, n))
+ if (likely(access_ok(VERIFY_READ, from, n))) {
memcpy(to, (const void __force *)from, n);
- else
- return n;
- return 0;
+ return 0;
+ }
+ memset(to, 0, n);
+ return n;
}
static inline unsigned long __must_check
--
2.10.0
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