From fb3d89498d268c8dedc1ab5b15fa64f536564577 Mon Sep 17 00:00:00 2001
From: Neil Horman <nhorman@redhat.com>
Date: Tue, 28 Jun 2005 15:40:02 -0700
Subject: [PATCH] [IPVS]: Close race conditions on ip_vs_conn_tab list
 modification

In an smp system, it is possible for an connection timer to expire, calling
ip_vs_conn_expire while the connection table is being flushed, before
ct_write_lock_bh is acquired.

Since the list iterator loop in ip_vs_con_flush releases and re-acquires the
spinlock (even though it doesn't re-enable softirqs), it is possible for the
expiration function to modify the connection list, while it is being traversed
in ip_vs_conn_flush.

The result is that the next pointer gets set to NULL, and subsequently
dereferenced, resulting in an oops.

Signed-off-by: Neil Horman <nhorman@redhat.com>
Acked-by: JulianAnastasov
Signed-off-by: David S. Miller <davem@davemloft.net>
---
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