From: Joe Thornber <ejt@redhat.com>
Date: Thu, 10 Dec 2015 14:37:53 +0000 (+0000)
Subject: dm btree: fix bufio buffer leaks in dm_btree_del() error path
X-Git-Tag: v3.2.75~25
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=715b56f753f736b6b701e402f22e8d5a41471f1b;p=pandora-kernel.git

dm btree: fix bufio buffer leaks in dm_btree_del() error path

commit ed8b45a3679eb49069b094c0711b30833f27c734 upstream.

If dm_btree_del()'s call to push_frame() fails, e.g. due to
btree_node_validator finding invalid metadata, the dm_btree_del() error
path must unlock all frames (which have active dm-bufio buffers) that
were pushed onto the del_stack.

Otherwise, dm_bufio_client_destroy() will BUG_ON() because dm-bufio
buffers have leaked, e.g.:
  device-mapper: bufio: leaked buffer 3, hold count 1, list 0

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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