From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit aace880feea38875fbc919761b77e5732a3659ef upstream.
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
arch/parisc/include/asm/uaccess.h | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/arch/parisc/include/asm/uaccess.h b/arch/parisc/include/asm/uaccess.h
index e0a82358517e..9bbddafb0da3 100644
--- a/arch/parisc/include/asm/uaccess.h
+++ b/arch/parisc/include/asm/uaccess.h
@@ -9,6 +9,8 @@
#include <asm/errno.h>
#include <asm-generic/uaccess-unaligned.h>
+#include <linux/string.h>
+
#define VERIFY_READ 0
#define VERIFY_WRITE 1
@@ -246,13 +248,14 @@ static inline unsigned long __must_check copy_from_user(void *to,
unsigned long n)
{
int sz = __compiletime_object_size(to);
- int ret = -EFAULT;
+ unsigned long ret = n;
if (likely(sz == -1 || !__builtin_constant_p(n) || sz >= n))
ret = __copy_from_user(to, from, n);
else
copy_from_user_overflow();
-
+ if (unlikely(ret))
+ memset(to + (n - ret), 0, ret);
return ret;
}
--
2.10.0
--
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