[PATCH 3.18 20/29] userns; Correct the comment in map_write

[Greg Kroah-Hartman]

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

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

From: Eric W. Biederman <ebied...@xmission.com>

commit 36476beac4f8ca9dc7722790b2e8ef0e8e51034e upstream.

It is important that all maps are less than PAGE_SIZE
or else setting the last byte of the buffer to '0'
could write off the end of the allocated storage.

Correct the misleading comment.

Signed-off-by: "Eric W. Biederman" <ebied...@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 kernel/user_namespace.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -643,7 +643,7 @@ static ssize_t map_write(struct file *fi
        if (!page)
                goto out;
 
-       /* Only allow <= page size writes at the beginning of the file */
+       /* Only allow < page size writes at the beginning of the file */
        ret = -EINVAL;
        if ((*ppos != 0) || (count >= PAGE_SIZE))
                goto out;