tree 6ac67a645d42fa2730eb6b8f8a71ea078c5c676c
parent 7f3b5ef8184a929f56293d6c7a88f426c7b74558
author Mike Snitzer <snitzer@redhat.com> 1316989577 +0100
committer Greg Kroah-Hartman <gregkh@suse.de> 1318799693 -0700

dm table: avoid crash if integrity profile changes

commit 876fbba1db4a377f050a2bb49b474c7527b2995d upstream.

Commit a63a5cf (dm: improve block integrity support) introduced a
two-phase initialization of a DM device's integrity profile.  This
patch avoids dereferencing a NULL 'template_disk' pointer in
blk_integrity_register() if there is an integrity profile mismatch in
dm_table_set_integrity().

This can occur if the integrity profiles for stacked devices in a DM
table are changed between the call to dm_table_prealloc_integrity() and
dm_table_set_integrity().

Reported-by: Zdenek Kabelac <zkabelac@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>