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authorJarek Poplawski <jarkao2@gmail.com>2009-06-15 02:31:29 -0700
committerDavid S. Miller <davem@davemloft.net>2009-06-15 02:31:29 -0700
commite0f7cb8c8cc6cccce28d2ce39ad8c60d23c3799f (patch)
tree204963b92fd4cdd8a73cd133ef36360c0d47014f /fs
parent3c4bdc4bd4af791a72147b6ebc29553808f53cea (diff)
ipv4: Fix fib_trie rebalancing
While doing trie_rebalance(): resize(), inflate(), halve() RCU free tnodes before updating their parents. It depends on RCU delaying the real destruction, but if RCU readers start after call_rcu() and before parent update they could access freed memory. It is currently prevented with preempt_disable() on the update side, but it's not safe, except maybe classic RCU, plus it conflicts with memory allocations with GFP_KERNEL flag used from these functions. This patch explicitly delays freeing of tnodes by adding them to the list, which is flushed after the update is finished. Reported-by: Yan Zheng <zheng.yan@oracle.com> Signed-off-by: Jarek Poplawski <jarkao2@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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