acpi, nfit: fix acpi_nfit_flush_probe() crash

We queue an on-stack work item to 'nfit_wq' and wait for it to complete
as part of a 'flush_probe' request. However, if the user cancels the
wait we need to make sure the item is flushed from the queue otherwise
we are leaving an out-of-scope stack address on the work list.

 BUG: unable to handle kernel paging request at ffffbcb3c72f7cd0
 IP: [<ffffffffa9413a7b>] __list_add+0x1b/0xb0
 [..]
 RIP: 0010:[<ffffffffa9413a7b>]  [<ffffffffa9413a7b>] __list_add+0x1b/0xb0
 RSP: 0018:ffffbcb3c7ba7c00  EFLAGS: 00010046
 [..]
 Call Trace:
  [<ffffffffa90bb11a>] insert_work+0x3a/0xc0
  [<ffffffffa927fdda>] ? seq_open+0x5a/0xa0
  [<ffffffffa90bb30a>] __queue_work+0x16a/0x460
  [<ffffffffa90bbb08>] queue_work_on+0x38/0x40
  [<ffffffffc0cf2685>] acpi_nfit_flush_probe+0x95/0xc0 [nfit]
  [<ffffffffc0cf25d0>] ? nfit_visible+0x40/0x40 [nfit]
  [<ffffffffa9571495>] wait_probe_show+0x25/0x60
  [<ffffffffa9546b30>] dev_attr_show+0x20/0x50

Fixes: 7ae0fa439faf ("nfit, libnvdimm: async region scrub workqueue")
Cc: <stable@vger.kernel.org>
Reviewed-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index 2f82b8eba360..7361d00818e2 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -2704,6 +2704,7 @@ static int acpi_nfit_flush_probe(struct nvdimm_bus_descriptor *nd_desc)
         struct acpi_nfit_desc *acpi_desc = to_acpi_nfit_desc(nd_desc);
         struct device *dev = acpi_desc->dev;
         struct acpi_nfit_flush_work flush;
+        int rc;
 
         /* bounce the device lock to flush acpi_nfit_add / acpi_nfit_notify */
         device_lock(dev);
@@ -2716,7 +2717,10 @@ static int acpi_nfit_flush_probe(struct nvdimm_bus_descriptor *nd_desc)
         INIT_WORK_ONSTACK(&flush.work, flush_probe);
         COMPLETION_INITIALIZER_ONSTACK(flush.cmp);
         queue_work(nfit_wq, &flush.work);
-        return wait_for_completion_interruptible(&flush.cmp);
+
+        rc = wait_for_completion_interruptible(&flush.cmp);
+        cancel_work_sync(&flush.work);
+        return rc;
 }
 
 static int acpi_nfit_clear_to_send(struct nvdimm_bus_descriptor *nd_desc,