Patch "mm: Fix memory size alignment in devm_memremap_pages_release()" has been added to the 4.14-stable tree

Patch "mm: Fix memory size alignment in devm_memremap_pages_release()" has been added to the 4.14-stable tree

[gregkh]

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

    mm: Fix memory size alignment in devm_memremap_pages_release()

to the 4.14-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:
     mm-fix-memory-size-alignment-in-devm_memremap_pages_release.patch
and it can be found in the queue-4.14 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 10a0cd6e4932b5078215b1ec2c896597eec0eff9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20H=2E=20Sch=C3=B6nherr?= <jschoenh@amazon.de>
Date: Fri, 19 Jan 2018 16:27:54 -0800
Subject: mm: Fix memory size alignment in devm_memremap_pages_release()
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Jan H. Schönherr <jschoenh@amazon.de>

commit 10a0cd6e4932b5078215b1ec2c896597eec0eff9 upstream.

The functions devm_memremap_pages() and devm_memremap_pages_release() use
different ways to calculate the section-aligned amount of memory. The
latter function may use an incorrect size if the memory region is small
but straddles a section border.

Use the same code for both.

Cc: <stable@vger.kernel.org>
Fixes: 5f29a77cd957 ("mm: fix mixed zone detection in devm_memremap_pages")
Signed-off-by: Jan H. Schönherr <jschoenh@amazon.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 kernel/memremap.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -301,7 +301,8 @@ static void devm_memremap_pages_release(
 
 	/* pages are dead and unused, undo the arch mapping */
 	align_start = res->start & ~(SECTION_SIZE - 1);
-	align_size = ALIGN(resource_size(res), SECTION_SIZE);
+	align_size = ALIGN(res->start + resource_size(res), SECTION_SIZE)
+		- align_start;
 
 	mem_hotplug_begin();
 	arch_remove_memory(align_start, align_size);


Patches currently in stable-queue which might be from jschoenh@amazon.de are

queue-4.14/mm-fix-memory-size-alignment-in-devm_memremap_pages_release.patch