Patch "libnvdimm, pfn: fix uuid validation" has been added to the 4.5-stable tree

Patch "libnvdimm, pfn: fix uuid validation" has been added to the 4.5-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    libnvdimm, pfn: fix uuid validation

to the 4.5-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     libnvdimm-pfn-fix-uuid-validation.patch
and it can be found in the queue-4.5 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From e5670563f588ed1c0603819350c0f02cec23f5c5 Mon Sep 17 00:00:00 2001
From: Dan Williams <dan.j.williams@intel.com>
Date: Thu, 7 Apr 2016 19:59:27 -0700
Subject: libnvdimm, pfn: fix uuid validation

From: Dan Williams <dan.j.williams@intel.com>

commit e5670563f588ed1c0603819350c0f02cec23f5c5 upstream.

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.

Reported-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/nvdimm/pfn_devs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/nvdimm/pfn_devs.c
+++ b/drivers/nvdimm/pfn_devs.c
@@ -315,7 +315,7 @@ int nd_pfn_validate(struct nd_pfn *nd_pf
 	} 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)) {


Patches currently in stable-queue which might be from dan.j.williams@intel.com are

queue-4.5/libnvdimm-pfn-fix-uuid-validation.patch
queue-4.5/libnvdimm-fix-smart-data-retrieval.patch