From 8f5ff877bf19076c49eda0b440ad16507ebd1fcf Mon Sep 17 00:00:00 2001 From: Al Viro Date: Mon, 5 Sep 2016 21:42:32 -0400 Subject: [PATCH] nfs_write_end(): fix handling of short copies 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 Signed-off-by: Greg Kroah-Hartman --- fs/nfs/file.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/nfs/file.c b/fs/nfs/file.c index ca699ddc11c1..e6a0d22315e9 100644 --- a/fs/nfs/file.c +++ b/fs/nfs/file.c @@ -397,7 +397,7 @@ 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, -- 2.43.0