[PATCH 4.13 39/53] bio_copy_user_iov(): dont ignore ->iov_offset

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

4.13-stable review patch.  If anyone has any objections, please let me know.

------------------

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

commit 1cfd0ddd82232804e03f3023f6a58b50dfef0574 upstream.

Since "block: support large requests in blk_rq_map_user_iov" we
started to call it with partially drained iter; that works fine
on the write side, but reads create a copy of iter for completion
time.  And that needs to take the possibility of ->iov_iter != 0
into account...

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

---
 block/bio.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/block/bio.c
+++ b/block/bio.c
@@ -1235,8 +1235,8 @@ struct bio *bio_copy_user_iov(struct req
 	 */
 	bmd->is_our_pages = map_data ? 0 : 1;
 	memcpy(bmd->iov, iter->iov, sizeof(struct iovec) * iter->nr_segs);
-	iov_iter_init(&bmd->iter, iter->type, bmd->iov,
-			iter->nr_segs, iter->count);
+	bmd->iter = *iter;
+	bmd->iter.iov = bmd->iov;
 
 	ret = -ENOMEM;
 	bio = bio_kmalloc(gfp_mask, nr_pages);