Patch "mm: fix invalid node in alloc_migrate_target()" has been added to the 4.4-stable tree

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

mm: fix invalid node in alloc_migrate_target()

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:
mm-fix-invalid-node-in-alloc_migrate_target.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 <[email protected]> know about it.

From: Xishi Qiu <[email protected]>
Date: Fri, 1 Apr 2016 14:31:20 -0700
Subject: mm: fix invalid node in alloc_migrate_target()

From: Xishi Qiu <[email protected]>

commit 6f25a14a7053b69917e2ebea0d31dd444cd31fd5 upstream.

It is incorrect to use next_node to find a target node, it will return MAX_NUMNODES or invalid node. This will lead to crash in buddy system allocation.

---
 mm/page_isolation.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

@@ -283,11 +283,11 @@ struct page *alloc_migrate_target(struct
 	 * now as a simple work-around, we use the next node for destination.
 	 */
 	if (PageHuge(page)) {
-		nodemask_t src = nodemask_of_node(page_to_nid(page));
-		nodemask_t dst;
-		nodes_complement(dst, src);
+		int node = next_online_node(page_to_nid(page));
+		if (node == MAX_NUMNODES)
+			node = first_online_node;
 		return alloc_huge_page_node(page_hstate(compound_head(page)),
-					    next_node(page_to_nid(page), dst));
+					    node);
 	}
 
 	if (PageHighMem(page))

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/mm-fix-invalid-node-in-alloc_migrate_target.patch