Patch "mm/memblock.c: reversed logic in memblock_discard()" has been added to the 4.9-stable tree

Patch "mm/memblock.c: reversed logic in memblock_discard()" has been added to the 4.9-stable tree

[gregkh]

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

    mm/memblock.c: reversed logic in memblock_discard()

to the 4.9-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-memblock.c-reversed-logic-in-memblock_discard.patch
and it can be found in the queue-4.9 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 91b540f98872a206ea1c49e4aa6ea8eed0886644 Mon Sep 17 00:00:00 2001
From: Pavel Tatashin <pasha.tatashin@oracle.com>
Date: Fri, 25 Aug 2017 15:55:46 -0700
Subject: mm/memblock.c: reversed logic in memblock_discard()

From: Pavel Tatashin <pasha.tatashin@oracle.com>

commit 91b540f98872a206ea1c49e4aa6ea8eed0886644 upstream.

In recently introduced memblock_discard() there is a reversed logic bug.
Memory is freed of static array instead of dynamically allocated one.

Link: http://lkml.kernel.org/r/1503511441-95478-2-git-send-email-pasha.tatashin@oracle.com
Fixes: 3010f876500f ("mm: discard memblock data later")
Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Reported-by: Woody Suwalski <terraluna977@gmail.com>
Tested-by: Woody Suwalski <terraluna977@gmail.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 mm/memblock.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -311,7 +311,7 @@ void __init memblock_discard(void)
 		__memblock_free_late(addr, size);
 	}
 
-	if (memblock.memory.regions == memblock_memory_init_regions) {
+	if (memblock.memory.regions != memblock_memory_init_regions) {
 		addr = __pa(memblock.memory.regions);
 		size = PAGE_ALIGN(sizeof(struct memblock_region) *
 				  memblock.memory.max);


Patches currently in stable-queue which might be from pasha.tatashin@oracle.com are

queue-4.9/mm-memblock.c-reversed-logic-in-memblock_discard.patch