netdev - Re: [PATCH net] mlxsw: core: Unpublish devlink parameters during reload

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Message-Id: <20191030.120457.1939571805404166408.davem@davemloft.net>
Date:   Wed, 30 Oct 2019 12:04:57 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     idosch@...sch.org
Cc:     netdev@...r.kernel.org, jiri@...lanox.com, mlxsw@...lanox.com,
        idosch@...lanox.com
Subject: Re: [PATCH net] mlxsw: core: Unpublish devlink parameters during
 reload

From: Ido Schimmel <idosch@...sch.org>
Date: Wed, 30 Oct 2019 11:04:22 +0200

> From: Jiri Pirko <jiri@...lanox.com>
> 
> The devlink parameter "acl_region_rehash_interval" is a runtime
> parameter whose value is stored in a dynamically allocated memory. While
> reloading the driver, this memory is freed and then allocated again. A
> use-after-free might happen if during this time frame someone tries to
> retrieve its value.
> 
> Since commit 070c63f20f6c ("net: devlink: allow to change namespaces
> during reload") the use-after-free can be reliably triggered when
> reloading the driver into a namespace, as after freeing the memory (via
> reload_down() callback) all the parameters are notified.
> 
> Fix this by unpublishing and then re-publishing the parameters during
> reload.
> 
> Fixes: 98bbf70c1c41 ("mlxsw: spectrum: add "acl_region_rehash_interval" devlink param")
> Fixes: 7c62cfb8c574 ("devlink: publish params only after driver init is done")
> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
> Signed-off-by: Ido Schimmel <idosch@...lanox.com>

Applied and queued up for -stable.