From: Xishi Qiu <qiuxishi@xxxxxxxxxx>
Subject: mm: fix invalid node in alloc_migrate_target()
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.
Fixes: c8721bbbdd36 ("mm: memory-hotplug: enable memory hotplug to handle hugepage")
Signed-off-by: Xishi Qiu <qiuxishi@xxxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Acked-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Cc: Joonsoo Kim <js1304@xxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: "Laura Abbott" <lauraa@xxxxxxxxxxxxxx>
Cc: Hui Zhu <zhuhui@xxxxxxxxxx>
Cc: Wang Xiaoqiang <wangxq10@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_isolation.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff -puN mm/page_isolation.c~mm-fix-invalid-node-in-alloc_migrate_target mm/page_isolation.c
--- a/mm/page_isolation.c~mm-fix-invalid-node-in-alloc_migrate_target
+++ a/mm/page_isolation.c
@@ -289,11 +289,11 @@ 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))
_
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html