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[PATCH 3.2 121/152] sparc32: fix copy_from_user()

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  [PATCH 3.2 121/152] sparc32: fix copy_from_user() Ben Hutchings <ben@decadent.org.uk> - 2016-11-14 03:20 +0100

#1520824 — [PATCH 3.2 121/152] sparc32: fix copy_from_user()

3.2.84-rc1 review patch.  If anyone has any objections, please let me know.

------------------

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

commit 917400cecb4b52b5cde5417348322bb9c8272fa6 upstream.

Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 arch/sparc/include/asm/uaccess_32.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/arch/sparc/include/asm/uaccess_32.h
+++ b/arch/sparc/include/asm/uaccess_32.h
@@ -264,8 +264,10 @@ static inline unsigned long copy_from_us
 {
 	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)

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