[PATCH] libnvdimm/dimm: Fix security capability detection for non-Intel NVDIMMs

[Dan Williams]

Kees reports a crash with the following signature...

 RIP: 0010:nvdimm_visible+0x79/0x80
 [..]
 Call Trace:
  internal_create_group+0xf4/0x380
  sysfs_create_groups+0x46/0xb0
  device_add+0x331/0x680
  nd_async_device_register+0x15/0x60
  async_run_entry_fn+0x38/0x100

...when starting a QEMU environment with "label-less" DIMM. Without
labels QEMU does not publish any DSM methods. Without defined methods
the NVDIMM_FAMILY type is not established and the nfit driver will skip
registering security operations.

In that case the security state should be initialized to a negative
value in __nvdimm_create() and nvdimm_visible() should skip
interrogating the specific ops. However, since 'enum
nvdimm_security_state' was only defined to contain positive values the
"if (nvdimm->sec.state < 0)" check always fails.

Define a negative error state to allow negative state values to be
handled as expected.

Fixes: f2989396553a ("acpi/nfit, libnvdimm: Introduce nvdimm_security_ops")
Cc: Dave Jiang <dave.jiang@xxxxxxxxx>
Reported-by: Kees Cook <keescook@xxxxxxxxxxxx>
Tested-by: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
 include/linux/libnvdimm.h |    1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index 5440f11b0907..7315977b64da 100644
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -160,6 +160,7 @@ static inline struct nd_blk_region_desc *to_blk_region_desc(
 }
 
 enum nvdimm_security_state {
+	NVDIMM_SECURITY_ERROR = -1,
 	NVDIMM_SECURITY_DISABLED,
 	NVDIMM_SECURITY_UNLOCKED,
 	NVDIMM_SECURITY_LOCKED,