From: David Miller <davem@davemloft.net>
To: harish_kandiga@mentor.com
Cc: dborkman@redhat.com, tgraf@suug.ch, ebiederm@xmission.com,
darkjames-ws@darkjames.pl, rgb@redhat.com,
eric.dumazet@gmail.com, stephen@networkplumber.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH] netlink: Safer deletion of sk_bind_node
Date: Tue, 02 Sep 2014 11:52:15 -0700 (PDT) [thread overview]
Message-ID: <20140902.115215.1488500321662046816.davem@davemloft.net> (raw)
In-Reply-To: <54058376.9090700@mentor.com>
From: Harish Jenny Kandiga Nagaraj <harish_kandiga@mentor.com>
Date: Tue, 2 Sep 2014 14:14:38 +0530
> In one of our random test runs we observed the crash mentioned in the previous mail.
>
> After debugging we found out that the call flow of the inline and static functions were
> netlink_release
> -----netlink_remove
> ---------__sk_del_bind_node
> --------------__hlist_del
>
> *pprev was NULL in __hlist_del function while deleting &sk->sk_bind_node hlist_node. Hence the patch was given.
>
> In netlink_remove function , first the sk_del_node_init function will be called. This internally calls __sk_del_node_init function. While deleting &sk->sk_node hlist_node using __sk_del_node function there is a NULL check with sk_hashed function.
>
> Why there is no NULL check for *pprev while deleting &sk->sk_bind_node ?
Because if ->subscriptions is non-zero, it must be on a list, and therefore
pprev must be non-NULL.
next prev parent reply other threads:[~2014-09-02 18:52 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-01 7:08 [PATCH] netlink: Safer deletion of sk_bind_node Harish, Jenny, K, N
2014-09-02 1:12 ` Eric W. Biederman
2014-09-02 5:03 ` David Miller
2014-09-02 8:44 ` [RFC PATCH] " Harish Jenny Kandiga Nagaraj
2014-09-02 18:52 ` David Miller [this message]
2014-09-03 5:19 ` Harish Jenny Kandiga Nagaraj
2014-09-03 5:28 ` David Miller
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