libnvdimm, pmem: fix a NULL pointer BUG in nd_pmem_notify
authorToshi Kani <toshi.kani@hpe.com>
Tue, 25 Apr 2017 23:04:13 +0000 (17:04 -0600)
committerDan Williams <dan.j.williams@intel.com>
Fri, 28 Apr 2017 19:46:47 +0000 (12:46 -0700)
commitb2518c78ce76896f0f8f7940bf02104b227e1709
tree9b8cfee35090df0d14df0e9e4ad20f3ff1d53cdc
parentab630891ce0eb83dc6c37971b35b228fc9e225ca
libnvdimm, pmem: fix a NULL pointer BUG in nd_pmem_notify

The following BUG was observed when nd_pmem_notify() was called
for a BTT device.  The use of a pmem_device pointer is not valid
with BTT.

 BUG: unable to handle kernel NULL pointer dereference at 0000000000000030
 IP: nd_pmem_notify+0x30/0xf0 [nd_pmem]
 Call Trace:
  nd_device_notify+0x40/0x50
  child_notify+0x10/0x20
  device_for_each_child+0x50/0x90
  nd_region_notify+0x20/0x30
  nd_device_notify+0x40/0x50
  nvdimm_region_notify+0x27/0x30
  acpi_nfit_scrub+0x341/0x590 [nfit]
  process_one_work+0x197/0x450
  worker_thread+0x4e/0x4a0
  kthread+0x109/0x140

Fix nd_pmem_notify() by setting nd_region and badblocks pointers
properly for BTT.

Cc: <stable@vger.kernel.org>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Fixes: 719994660c24 ("libnvdimm: async notification support")
Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
drivers/nvdimm/pmem.c