Commit c0cf3ef5 authored Sep 05, 2016 by Al Viro

nfs_write_end(): fix handling of short copies



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.

Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

parent e5517c2a

fs/nfs/file.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -374,7 +374,7 @@ static int nfs_write_end(struct file file, struct address_space mapping,
		*/
		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,