linux-kernel - [PATCH 4.14 069/183] libnvdimm, pfn: Fix over-trim in trim_pfn

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Date:   Fri, 22 Mar 2019 12:14:57 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Wei Yang <richardw.yang@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>
Subject: [PATCH 4.14 069/183] libnvdimm, pfn: Fix over-trim in trim_pfn_device()

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Wei Yang <richardw.yang@...ux.intel.com>

commit f101ada7da6551127d192c2f1742c1e9e0f62799 upstream.

When trying to see whether current nd_region intersects with others,
trim_pfn_device() has already calculated the *size* to be expanded to
SECTION size.

Do not double append 'adjust' to 'size' when calculating whether the end
of a region collides with the next pmem region.

Fixes: ae86cbfef381 "libnvdimm, pfn: Pad pfn namespaces relative to other regions"
Cc: <stable@...r.kernel.org>
Signed-off-by: Wei Yang <richardw.yang@...ux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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
@@ -618,7 +618,7 @@ static void trim_pfn_device(struct nd_pf
 	if (region_intersects(start, size, IORESOURCE_SYSTEM_RAM,
 				IORES_DESC_NONE) == REGION_MIXED
 			|| !IS_ALIGNED(end, nd_pfn->align)
-			|| nd_region_conflict(nd_region, start, size + adjust))
+			|| nd_region_conflict(nd_region, start, size))
 		*end_trunc = end - phys_pmem_align_down(nd_pfn, end);
 }