From 008440e3ad4b72f5048d1b1f6f5ed894fdc5ad08 Mon Sep 17 00:00:00 2001 From: Jarek Poplawski Date: Tue, 30 Jun 2009 12:47:19 -0700 Subject: [PATCH] ipv4: Fix fib_trie rebalancing, part 3 Alas current delaying of freeing old tnodes by RCU in trie_rebalance is still not enough because we can free a top tnode before updating a t->trie pointer. Reported-by: Pawel Staszewski Tested-by: Pawel Staszewski Signed-off-by: Jarek Poplawski Signed-off-by: David S. Miller --- net/ipv4/fib_trie.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c index 012cf5a68581..00a54b246dfe 100644 --- a/net/ipv4/fib_trie.c +++ b/net/ipv4/fib_trie.c @@ -1021,6 +1021,9 @@ static void trie_rebalance(struct trie *t, struct tnode *tn) (struct node *)tn, wasfull); tp = node_parent((struct node *) tn); + if (!tp) + rcu_assign_pointer(t->trie, (struct node *)tn); + tnode_free_flush(); if (!tp) break; -- 2.30.2