netdev - Re: [RFC PATCH net-next 02/12] devlink: Hold a reference on parent device

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Date: Tue, 17 Oct 2023 11:01:38 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: Ido Schimmel <idosch@...dia.com>
Cc: netdev@...r.kernel.org, linux-pci@...r.kernel.org, davem@...emloft.net,
	kuba@...nel.org, pabeni@...hat.com, edumazet@...gle.com,
	bhelgaas@...gle.com, alex.williamson@...hat.com, lukas@...ner.de,
	petrm@...dia.com, jiri@...dia.com, mlxsw@...dia.com
Subject: Re: [RFC PATCH net-next 02/12] devlink: Hold a reference on parent
 device

Tue, Oct 17, 2023 at 10:11:24AM CEST, idosch@...dia.com wrote:
>On Tue, Oct 17, 2023 at 09:56:18AM +0200, Jiri Pirko wrote:
>> Tue, Oct 17, 2023 at 09:42:47AM CEST, idosch@...dia.com wrote:
>> >Each devlink instance is associated with a parent device and a pointer
>> >to this device is stored in the devlink structure, but devlink does not
>> >hold a reference on this device.
>> >
>> >This is going to be a problem in the next patch where - among other
>> >things - devlink will acquire the device lock during netns dismantle,
>> >before the reload operation. Since netns dismantle is performed
>> >asynchronously and since a reference is not held on the parent device,
>> >it will be possible to hit a use-after-free.
>> >
>> >Prepare for the upcoming change by holding a reference on the parent
>> >device.
>> >
>> 
>> Just a note, I'm currently pushing the same patch as a part
>> of my patchset:
>> https://lore.kernel.org/all/20231013121029.353351-4-jiri@resnulli.us/
>
>Then you probably need patch #1 as well:
>
>https://lore.kernel.org/netdev/20231017074257.3389177-2-idosch@nvidia.com/

Correct.