From: Vitaly Mayatskikh <v.mayatskih@gmail.com>
Date: Fri, 22 Sep 2017 05:18:39 +0000 (-0400)
Subject: fix unbalanced page refcounting in bio_map_user_iov
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9ff5d8fe36745867da8a028b3ea58629f7546155;p=pandora-kernel.git

fix unbalanced page refcounting in bio_map_user_iov

commit 95d78c28b5a85bacbc29b8dba7c04babb9b0d467 upstream.

bio_map_user_iov and bio_unmap_user do unbalanced pages refcounting if
IO vector has small consecutive buffers belonging to the same page.
bio_add_pc_page merges them into one, but the page reference is never
dropped.

Signed-off-by: Vitaly Mayatskikh <v.mayatskih@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
[bwh: Backported to 3.2: adjust filename]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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