linux-kernel - [PATCH 3.10 085/319] blackfin: fix copy_from

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Message-Id: <1486322486-8024-56-git-send-email-w@1wt.eu>
Date:   Sun,  5 Feb 2017 20:21:12 +0100
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Al Viro <viro@...iv.linux.org.uk>, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 085/319] blackfin: fix copy_from_user()

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

commit 8f035983dd826d7e04f67b28acf8e2f08c347e41 upstream.

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Willy Tarreau <w@....eu>
---
 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 57701c3..a992a78 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
-- 
2.8.0.rc2.1.gbe9624a