libnvdimm, region: fix flush hint detection crash

In the case where a dimm does not have any associated flush hints the
ndrd->flush_wpq array may be uninitialized leading to crashes with the
following signature:

 BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
 IP: region_visible+0x10f/0x160 [libnvdimm]

 Call Trace:
  internal_create_group+0xbe/0x2f0
  sysfs_create_groups+0x40/0x80
  device_add+0x2d8/0x650
  nd_async_device_register+0x12/0x40 [libnvdimm]
  async_run_entry_fn+0x39/0x170
  process_one_work+0x212/0x6c0
  ? process_one_work+0x197/0x6c0
  worker_thread+0x4e/0x4a0
  kthread+0x10c/0x140
  ? process_one_work+0x6c0/0x6c0
  ? kthread_create_on_node+0x60/0x60
  ret_from_fork+0x31/0x40

Cc: <stable@vger.kernel.org>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Fixes: f284a4f23752 ("libnvdimm: introduce nvdimm_flush() and nvdimm_has_flush()")
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index 8de5a04644a1671d4be0f83cb42032b4dc384e3a..24abceda986adb02bd4b16901f3cd75ac17433c3 100644 (file)
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -1000,17 +1000,20 @@ EXPORT_SYMBOL_GPL(nvdimm_flush);
  */
 int nvdimm_has_flush(struct nd_region *nd_region)
 {
-       struct nd_region_data *ndrd = dev_get_drvdata(&nd_region->dev);
        int i;
 
        /* no nvdimm == flushing capability unknown */
        if (nd_region->ndr_mappings == 0)
                return -ENXIO;
 
-       for (i = 0; i < nd_region->ndr_mappings; i++)
-               /* flush hints present, flushing required */
-               if (ndrd_get_flush_wpq(ndrd, i, 0))
+       for (i = 0; i < nd_region->ndr_mappings; i++) {
+               struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+               struct nvdimm *nvdimm = nd_mapping->nvdimm;
+
+               /* flush hints present / available */
+               if (nvdimm->num_flush)
                        return 1;
+       }
 
        /*
         * The platform defines dimm devices without hints, assume