From: Jiri Pirko <jiri@resnulli.us>
To: Ido Schimmel <idosch@nvidia.com>
Cc: netdev@vger.kernel.org, linux-pci@vger.kernel.org,
davem@davemloft.net, kuba@kernel.org, pabeni@redhat.com,
edumazet@google.com, bhelgaas@google.com,
alex.williamson@redhat.com, lukas@wunner.de, petrm@nvidia.com,
jiri@nvidia.com, mlxsw@nvidia.com
Subject: Re: [RFC PATCH net-next 02/12] devlink: Hold a reference on parent device
Date: Tue, 17 Oct 2023 11:01:38 +0200 [thread overview]
Message-ID: <ZS5Nclma7BXGNX3F@nanopsycho> (raw)
In-Reply-To: <ZS5BrH1AOVJyt6ac@shredder>
Tue, Oct 17, 2023 at 10:11:24AM CEST, idosch@nvidia.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@nvidia.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.
next prev parent reply other threads:[~2023-10-17 9:01 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-17 7:42 [RFC PATCH net-next 00/12] mlxsw: Add support for new reset flow Ido Schimmel
2023-10-17 7:42 ` [RFC PATCH net-next 01/12] netdevsim: Block until all devices are released Ido Schimmel
2023-10-19 0:53 ` Jakub Kicinski
2023-10-17 7:42 ` [RFC PATCH net-next 02/12] devlink: Hold a reference on parent device Ido Schimmel
2023-10-17 7:56 ` Jiri Pirko
2023-10-17 8:11 ` Ido Schimmel
2023-10-17 9:01 ` Jiri Pirko [this message]
2023-10-17 7:42 ` [RFC PATCH net-next 03/12] devlink: Acquire device lock during reload Ido Schimmel
2023-10-17 8:04 ` Jiri Pirko
2023-10-17 7:42 ` [RFC PATCH net-next 04/12] PCI: Add no PM reset quirk for NVIDIA Spectrum devices Ido Schimmel
2023-10-18 19:40 ` Bjorn Helgaas
2023-10-22 8:23 ` Ido Schimmel
2023-10-17 7:42 ` [RFC PATCH net-next 05/12] PCI: Add device-specific reset " Ido Schimmel
2023-10-17 10:00 ` Lukas Wunner
2023-10-18 20:08 ` Bjorn Helgaas
2023-10-25 11:05 ` Ido Schimmel
2023-10-17 7:42 ` [RFC PATCH net-next 06/12] PCI: Add debug print for device ready delay Ido Schimmel
2023-10-18 19:41 ` Bjorn Helgaas
2023-10-17 7:42 ` [RFC PATCH net-next 07/12] mlxsw: Extend MRSR pack() function to support new commands Ido Schimmel
2023-10-17 7:42 ` [RFC PATCH net-next 08/12] mlxsw: pci: Rename mlxsw_pci_sw_reset() Ido Schimmel
2023-10-17 7:42 ` [RFC PATCH net-next 09/12] mlxsw: pci: Move software reset code to a separate function Ido Schimmel
2023-10-17 7:42 ` [RFC PATCH net-next 10/12] mlxsw: pci: Add support for new reset flow Ido Schimmel
2023-10-17 7:42 ` [RFC PATCH net-next 11/12] mlxsw: pci: Implement PCI reset handlers Ido Schimmel
2023-10-17 7:42 ` [RFC PATCH net-next 12/12] selftests: mlxsw: Add PCI reset test Ido Schimmel
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