tree df134b1c01cd6385afe7ff7171eb722063de6b4b
parent 68e58a294fb26f692697179e3f3ecf88dd8cb97c
author Mike Snitzer <snitzer@redhat.com> 1316989577 +0100
committer Alasdair G Kergon <agk@redhat.com> 1316989577 +0100

dm table: avoid crash if integrity profile changes

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>
Cc: stable@kernel.org # 2.6.39