linux-kernel - [PATCH] libnvdimm, pfn: fix uuid validation

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Date:	Tue, 29 Mar 2016 11:28:09 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	linux-nvdimm@...ts.01.org
Cc:	Jeff Moyer <jmoyer@...hat.com>, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: [PATCH] libnvdimm, pfn: fix uuid validation

If we detect a namespace has a stale info block in the init path, we
should overwrite with the latest configuration.  In fact, we already
return -ENODEV when the parent uuid is invalid, the same should be done
for the 'self' uuid.  Otherwise we can get into a condition where
userspace is unable to reconfigure the pfn-device without directly /
manually invalidating the info block.

Cc: <stable@...r.kernel.org>
Reported-by: Jeff Moyer <jmoyer@...hat.com>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
 drivers/nvdimm/pfn_devs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c
index 254d3bc13f70..e071e214feba 100644
--- a/drivers/nvdimm/pfn_devs.c
+++ b/drivers/nvdimm/pfn_devs.c
@@ -376,7 +376,7 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn)
 	} else {
 		/* from init we validate */
 		if (memcmp(nd_pfn->uuid, pfn_sb->uuid, 16) != 0)
-			return -EINVAL;
+			return -ENODEV;
 	}
 
 	if (nd_pfn->align > nvdimm_namespace_capacity(ndns)) {