linux-kernel - [PATCH 3/5] mm/vmalloc: Initialize VA's list node after unlink

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Date:   Tue,  7 Jun 2022 11:34:47 +0200
From:   "Uladzislau Rezki (Sony)" <urezki@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Uladzislau Rezki <urezki@...il.com>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>
Subject: [PATCH 3/5] mm/vmalloc: Initialize VA's list node after unlink

A vmap_area can travel between different places. For example
attached/detached to/from different rb-trees. In order to
prevent fancy bugs, initialize a VA's list node after it is
removed from the list, so it pairs with VA's rb_node which
is also initialized.

There is no functional change as a result of this patch.

Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
---
 mm/vmalloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 745e89eb6ca1..82771e555273 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -978,7 +978,7 @@ __unlink_va(struct vmap_area *va, struct rb_root *root, bool augment)
 	else
 		rb_erase(&va->rb_node, root);
 
-	list_del(&va->list);
+	list_del_init(&va->list);
 	RB_CLEAR_NODE(&va->rb_node);
 }
 
-- 
2.30.2