Patch "nfs_write_end(): fix handling of short copies" has been added to the 4.8-stable tree

Patch "nfs_write_end(): fix handling of short copies" has been added to the 4.8-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    nfs_write_end(): fix handling of short copies

to the 4.8-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     nfs_write_end-fix-handling-of-short-copies.patch
and it can be found in the queue-4.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From c0cf3ef5e0f47e385920450b245d22bead93e7ad Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Mon, 5 Sep 2016 21:42:32 -0400
Subject: nfs_write_end(): fix handling of short copies

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

commit c0cf3ef5e0f47e385920450b245d22bead93e7ad upstream.

What matters when deciding if we should make a page uptodate is
not how much we _wanted_ to copy, but how much we actually have
copied.  As it is, on architectures that do not zero tail on
short copy we can leave uninitialized data in page marked uptodate.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/nfs/file.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -397,7 +397,7 @@ static int nfs_write_end(struct file *fi
 	 */
 	if (!PageUptodate(page)) {
 		unsigned pglen = nfs_page_length(page);
-		unsigned end = offset + len;
+		unsigned end = offset + copied;
 
 		if (pglen == 0) {
 			zero_user_segments(page, 0, offset,


Patches currently in stable-queue which might be from viro@zeniv.linux.org.uk are

queue-4.8/sg_write-bsg_write-is-not-fit-to-be-called-under-kernel_ds.patch
queue-4.8/nfs_write_end-fix-handling-of-short-copies.patch