From: Marek Lindner <mareklindner@neomailbox.ch>
To: The list for a Better Approach To Mobile Ad-hoc Networking
<b.a.t.m.a.n@lists.open-mesh.org>
Subject: Re: [B.A.T.M.A.N.] [PATCH 2/5] batman-adv: Prevent duplicated nc_node entry
Date: Thu, 06 Sep 2018 19:45:43 +0800 [thread overview]
Message-ID: <3845719.Az451rQS5Q@rousseau> (raw)
In-Reply-To: <20180812190445.28013-3-sven@narfation.org>
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On Monday, 13 August 2018 03:04:42 HKT Sven Eckelmann wrote:
> The function batadv_nc_get_nc_node is responsible for adding new nc_nodes
> to the in_coding_list and out_coding_list. It first checks whether the
> entry already is in the list or not. If it is, then the creation of a new
> entry is aborted.
>
> But the lock for the list is only held when the list is really modified.
> This could lead to duplicated entries because another context could create
> an entry with the same key between the check and the list manipulation.
>
> The check and the manipulation of the list must therefore be in the same
> locked code section.
>
> Fixes: 3ed7ada3f0bb ("batman-adv: network coding - detect coding nodes and
> remove these after timeout") Signed-off-by: Sven Eckelmann
> <sven@narfation.org>
Acked-by: Marek Lindner <mareklindner@neomailbox.ch>
Cheers,
Marek
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next prev parent reply other threads:[~2018-09-06 11:45 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-12 19:04 [B.A.T.M.A.N.] [PATCH 0/5] batman-adv: Missing list checks for *list_add* Sven Eckelmann
2018-08-12 19:04 ` [B.A.T.M.A.N.] [PATCH 1/5] batman-adv: Prevent duplicated gateway_node entry Sven Eckelmann
2018-09-06 11:41 ` Marek Lindner
2018-08-12 19:04 ` [B.A.T.M.A.N.] [PATCH 2/5] batman-adv: Prevent duplicated nc_node entry Sven Eckelmann
2018-09-06 11:45 ` Marek Lindner [this message]
2018-08-12 19:04 ` [B.A.T.M.A.N.] [PATCH 3/5] batman-adv: Prevent duplicated softif_vlan entry Sven Eckelmann
2018-09-06 12:00 ` Marek Lindner
2018-08-12 19:04 ` [B.A.T.M.A.N.] [PATCH 4/5] batman-adv: Prevent duplicated global TT entry Sven Eckelmann
2018-09-06 12:03 ` Marek Lindner
2018-08-12 19:04 ` [B.A.T.M.A.N.] [PATCH 5/5] batman-adv: Prevent duplicated tvlv handler Sven Eckelmann
2018-09-06 12:05 ` Marek Lindner
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