diff options
| author |   Mike Snitzer <snitzer@redhat.com> | 2018-03-12 20:30:43 -0400 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2018-03-13 15:09:56 -0400 |
| commit | c37366742baa2bb3225be507d283baef151c5f8a (patch) | |
| tree | 9526b900d1fe467562bf53d368703a2a3ee8450a /drivers | |
| parent | Linux 4.16-rc5 (diff) | |
| download | linux-dev-c37366742baa2bb3225be507d283baef151c5f8a.tar.xz linux-dev-c37366742baa2bb3225be507d283baef151c5f8a.zip | |
dm mpath: fix uninitialized 'pg_init_wait' waitqueue_head NULL pointer
Initialize all the scsi_dh related 'struct multipath' members regardless
of whether a scsi_dh is in use or not.
The subtle (and fragile) SCSI-assuming legacy code clearly needs further
decoupling from non-SCSI (and/or developer understanding).
Fixes: 8d47e65948dd ("dm mpath: remove unnecessary NVMe branching in favor of scsi_dh checks")
Reported-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/md/dm-mpath.c | 21 |
1 files changed, 10 insertions, 11 deletions
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c index 3fde9e9faddd..87c404eebe9f 100644 --- a/drivers/md/dm-mpath.c +++ b/drivers/md/dm-mpath.c @@ -223,6 +223,16 @@ static int alloc_multipath_stage2(struct dm_target *ti, struct multipath *m) dm_table_set_type(ti->table, m->queue_mode); + /* + * Init fields that are only used when a scsi_dh is attached + * - must do this unconditionally (really doesn't hurt non-SCSI uses) + */ + set_bit(MPATHF_QUEUE_IO, &m->flags); + atomic_set(&m->pg_init_in_progress, 0); + atomic_set(&m->pg_init_count, 0); + m->pg_init_delay_msecs = DM_PG_INIT_DELAY_DEFAULT; + init_waitqueue_head(&m->pg_init_wait); + return 0; } @@ -331,7 +341,6 @@ static void __switch_pg(struct multipath *m, struct priority_group *pg) set_bit(MPATHF_PG_INIT_REQUIRED, &m->flags); set_bit(MPATHF_QUEUE_IO, &m->flags); } else { - /* FIXME: not needed if no scsi_dh is attached */ clear_bit(MPATHF_PG_INIT_REQUIRED, &m->flags); clear_bit(MPATHF_QUEUE_IO, &m->flags); } @@ -823,16 +832,6 @@ retain: */ kfree(m->hw_handler_name); m->hw_handler_name = attached_handler_name; - - /* - * Init fields that are only used when a scsi_dh is attached - */ - if (!test_and_set_bit(MPATHF_QUEUE_IO, &m->flags)) { - atomic_set(&m->pg_init_in_progress, 0); - atomic_set(&m->pg_init_count, 0); - m->pg_init_delay_msecs = DM_PG_INIT_DELAY_DEFAULT; - init_waitqueue_head(&m->pg_init_wait); - } } } |