From 26eb3c7ccfabf3642c7af149a29bf5b4d0600ac8 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: Willy Tarreau --- 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 a87a44f8411..f8bd4ea2a89 100644 --- a/fs/nfs/file.c +++ b/fs/nfs/file.c @@ -419,7 +419,7 @@ 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, -- 2.20.1