From dbac61a3f2afac562efa51b0a196ed71b6b8d109 Mon Sep 17 00:00:00 2001 From: "Gustavo A. R. Silva" Date: Mon, 10 Jul 2017 15:47:23 -0700 Subject: [PATCH] mm/memory_hotplug.c: add NULL check to avoid potential NULL pointer dereference The NULL check at line 1226: if (!pgdat), implies that pointer pgdat might be NULL. rollback_node_hotadd() dereferences this pointer. Add NULL check to avoid a potential NULL pointer dereference. Addresses-Coverity-ID: 1369133 Link: http://lkml.kernel.org/r/20170530212436.GA6195@embeddedgus Signed-off-by: Gustavo A. R. Silva Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/memory_hotplug.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index f79aac7..7b1311a 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1268,7 +1268,7 @@ register_fail: error: /* rollback pgdat allocation and others */ - if (new_pgdat) + if (new_pgdat && pgdat) rollback_node_hotadd(nid, pgdat); memblock_remove(start, size); -- 2.7.4