netdev - Re: [PATCH v2 net-next 06/14] netlink: hold nlk->cb_mutex longer in __netlink_dump

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Date: Thu, 22 Feb 2024 17:20:25 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Eric Dumazet <edumazet@...gle.com>
Cc: "David S . Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, Ido Schimmel <idosch@...dia.com>,
	Jiri Pirko <jiri@...dia.com>, eric.dumazet@...il.com
Subject: Re: [PATCH v2 net-next 06/14] netlink: hold nlk->cb_mutex longer in
 __netlink_dump_start()

Thu, Feb 22, 2024 at 11:50:13AM CET, edumazet@...gle.com wrote:
>__netlink_dump_start() releases nlk->cb_mutex right before
>calling netlink_dump() which grabs it again.

Yeah, I spotted this recently as well. Good to get rid of it.


>
>This seems dangerous, even if KASAN did not bother yet.
>
>Add a @lock_taken parameter to netlink_dump() to let it
>grab the mutex if called from netlink_recvmsg() only.
>
>Signed-off-by: Eric Dumazet <edumazet@...gle.com>


Reviewed-by: Jiri Pirko <jiri@...dia.com>