Patch "mm/frame_vector.c: release a semaphore in 'get_vaddr_frames()'" has been added to the 4.14-stable tree

Patch "mm/frame_vector.c: release a semaphore in 'get_vaddr_frames()'" 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/frame_vector.c: release a semaphore in 'get_vaddr_frames()'

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-frame_vector.c-release-a-semaphore-in-get_vaddr_frames.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 foo@baz Wed Feb 28 16:23:28 CET 2018
From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Date: Thu, 14 Dec 2017 15:33:08 -0800
Subject: mm/frame_vector.c: release a semaphore in 'get_vaddr_frames()'

From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>


[ Upstream commit 1f704fd0d14043e76e80f6b8b2251b9b2cedcca6 ]

A semaphore is acquired before this check, so we must release it before
leaving.

Link: http://lkml.kernel.org/r/20171211211009.4971-1-christophe.jaillet@wanadoo.fr
Fixes: b7f0554a56f2 ("mm: fail get_vaddr_frames() for filesystem-dax mappings")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: David Sterba <dsterba@suse.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 mm/frame_vector.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/mm/frame_vector.c
+++ b/mm/frame_vector.c
@@ -62,8 +62,10 @@ int get_vaddr_frames(unsigned long start
 	 * get_user_pages_longterm() and disallow it for filesystem-dax
 	 * mappings.
 	 */
-	if (vma_is_fsdax(vma))
-		return -EOPNOTSUPP;
+	if (vma_is_fsdax(vma)) {
+		ret = -EOPNOTSUPP;
+		goto out;
+	}
 
 	if (!(vma->vm_flags & (VM_IO | VM_PFNMAP))) {
 		vec->got_ref = true;


Patches currently in stable-queue which might be from christophe.jaillet@wanadoo.fr are

queue-4.14/mdio-sun4i-fix-a-memory-leak.patch
queue-4.14/mm-frame_vector.c-release-a-semaphore-in-get_vaddr_frames.patch