Patch "acpi, nfit, libnvdimm: fix interleave set cookie calculation (64-bit comparison)" has been added to the 4.4-stable tree

[<gregkh@linuxfoundation.org>]

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

    acpi, nfit, libnvdimm: fix interleave set cookie calculation (64-bit comparison)

to the 4.4-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:
     acpi-nfit-libnvdimm-fix-interleave-set-cookie-calculation-64-bit-comparison.patch
and it can be found in the queue-4.4 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 b03b99a329a14b7302f37c3ea6da3848db41c8c5 Mon Sep 17 00:00:00 2001
From: Dan Williams <dan.j.williams@intel.com>
Date: Mon, 27 Mar 2017 21:53:38 -0700
Subject: acpi, nfit, libnvdimm: fix interleave set cookie calculation (64-bit comparison)

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

commit b03b99a329a14b7302f37c3ea6da3848db41c8c5 upstream.

While reviewing the -stable patch for commit 86ef58a4e35e "nfit,
libnvdimm: fix interleave set cookie calculation" Ben noted:

    "This is returning an int, thus it's effectively doing a 32-bit
     comparison and not the 64-bit comparison you say is needed."

Update the compare operation to be immune to this integer demotion problem.

Cc: Nicholas Moulin <nicholas.w.moulin@linux.intel.com>
Fixes: 86ef58a4e35e ("nfit, libnvdimm: fix interleave set cookie calculation")
Reported-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/acpi/nfit.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/acpi/nfit.c
+++ b/drivers/acpi/nfit.c
@@ -979,7 +979,11 @@ static int cmp_map(const void *m0, const
 	const struct nfit_set_info_map *map0 = m0;
 	const struct nfit_set_info_map *map1 = m1;
 
-	return map0->region_offset - map1->region_offset;
+	if (map0->region_offset < map1->region_offset)
+		return -1;
+	else if (map0->region_offset > map1->region_offset)
+		return 1;
+	return 0;
 }
 
 /* Retrieve the nth entry referencing this spa */


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

queue-4.4/acpi-nfit-libnvdimm-fix-interleave-set-cookie-calculation-64-bit-comparison.patch
queue-4.4/libnvdimm-fix-reconfig_mutex-mmap_sem-and-jbd2_handle-lockdep-splat.patch