tree 6314746d47174913ec5994754b73e5e5baa2a2b4
parent 248022ffae3f641fd618b571e2a10bde37b1f148
author Keith Busch <kbusch@kernel.org> 1657035906 -0700
committer Keith Busch <kbusch@kernel.org> 1657639736 -0700

block: fix leaking page ref on truncated direct io

The size being added to a bio from an iov is aligned to a block size
after the pages were gotten. If the new aligned size truncates the last
page, its reference was being leaked. Ensure all pages that were not
added to the bio have their reference released.

Since this essentially requires doing the same that bio_put_pages(), and
there was only one caller for that function, this patch makes the
put_page() loop common for everyone.

Fixes: b1a000d3b8ec5 ("block: relax direct io memory alignment")
Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Keith Busch <kbusch@kernel.org>