From c214b2cc5f9be7c236f9b91acf524688ff0e3e72 Mon Sep 17 00:00:00 2001 From: Oleg Nesterov Date: Wed, 9 May 2007 02:34:18 -0700 Subject: [PATCH] ipvs: flush defense_work before module unload net/ipv4/ipvs/ip_vs_core.c module_exit ip_vs_cleanup ip_vs_control_cleanup cancel_rearming_delayed_work // done This is unsafe. The module may be unloaded and the memory may be freed while defense_work's handler is still running/preempted. Do flush_work(&defense_work.work) after cancel_rearming_delayed_work(). Alternatively, we could add flush_work() to cancel_rearming_delayed_work(), but note that we can't change cancel_delayed_work() in the same manner because it may be called from atomic context. Signed-off-by: Oleg Nesterov Cc: "David S. Miller" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- net/ipv4/ipvs/ip_vs_ctl.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/ipv4/ipvs/ip_vs_ctl.c b/net/ipv4/ipvs/ip_vs_ctl.c index b3050a6817e7..342e836677a1 100644 --- a/net/ipv4/ipvs/ip_vs_ctl.c +++ b/net/ipv4/ipvs/ip_vs_ctl.c @@ -2387,6 +2387,7 @@ void ip_vs_control_cleanup(void) EnterFunction(2); ip_vs_trash_cleanup(); cancel_rearming_delayed_work(&defense_work); + flush_work_keventd(&defense_work.work); ip_vs_kill_estimator(&ip_vs_stats); unregister_sysctl_table(sysctl_header); proc_net_remove("ip_vs_stats");