From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: davem@davemloft.net, netdev@vger.kernel.org
Subject: [PATCH 2/3] netfilter: IDLETIMER: fix race condition when destroy the target
Date: Mon, 9 May 2016 21:52:02 +0200 [thread overview]
Message-ID: <1462823523-6682-3-git-send-email-pablo@netfilter.org> (raw)
In-Reply-To: <1462823523-6682-1-git-send-email-pablo@netfilter.org>
From: Liping Zhang <liping.zhang@spreadtrum.com>
Workqueue maybe still in running while we destroy the IDLETIMER target,
thus cause a use after free error, add cancel_work_sync() to avoid such
situation.
Signed-off-by: Liping Zhang <liping.zhang@spreadtrum.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
net/netfilter/xt_IDLETIMER.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/net/netfilter/xt_IDLETIMER.c b/net/netfilter/xt_IDLETIMER.c
index 29d2c31..daf45da 100644
--- a/net/netfilter/xt_IDLETIMER.c
+++ b/net/netfilter/xt_IDLETIMER.c
@@ -236,6 +236,7 @@ static void idletimer_tg_destroy(const struct xt_tgdtor_param *par)
list_del(&info->timer->entry);
del_timer_sync(&info->timer->timer);
+ cancel_work_sync(&info->timer->work);
sysfs_remove_file(idletimer_tg_kobj, &info->timer->attr.attr);
kfree(info->timer->attr.attr.name);
kfree(info->timer);
--
2.1.4
next prev parent reply other threads:[~2016-05-09 19:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-09 19:52 [PATCH 0/3] Netfilter fixes for net Pablo Neira Ayuso
2016-05-09 19:52 ` [PATCH 1/3] netfilter: conntrack: init all_locks to avoid debug warning Pablo Neira Ayuso
2016-05-09 19:52 ` Pablo Neira Ayuso [this message]
2016-05-09 19:52 ` [PATCH 3/3] netfilter: nfnetlink_acct: validate NFACCT_QUOTA parameter Pablo Neira Ayuso
2016-05-10 4:50 ` [PATCH 0/3] Netfilter fixes for net David Miller
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