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nfs_write_end(): fix handling of short copies

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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>
This commit is contained in:
Al Viro 2016-09-05 21:42:32 -04:00 committed by Greg Kroah-Hartman
parent fc6cb9c303
commit b775b86a5f
1 changed files with 1 additions and 1 deletions
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fs/nfs/file.c
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@ -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,