netdev - Re: [PATCH v2] net: thunderbolt: Fix error handling in tbnet

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Date:   Mon, 14 Nov 2022 16:39:27 +0200
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Yuan Can <yuancan@...wei.com>
Cc:     michael.jamet@...el.com, YehezkelShB@...il.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, andriy.shevchenko@...ux.intel.com,
        amir.jer.levy@...el.com, netdev@...r.kernel.org
Subject: Re: [PATCH v2] net: thunderbolt: Fix error handling in tbnet_init()

On Mon, Nov 14, 2022 at 02:22:25PM +0000, Yuan Can wrote:
> A problem about insmod thunderbolt-net failed is triggered with following
> log given while lsmod does not show thunderbolt_net:
> 
>  insmod: ERROR: could not insert module thunderbolt-net.ko: File exists
> 
> The reason is that tbnet_init() returns tb_register_service_driver()
> directly without checking its return value, if tb_register_service_driver()
> failed, it returns without removing property directory, resulting the
> property directory can never be created later.
> 
>  tbnet_init()
>    tb_register_property_dir() # register property directory
>    tb_register_service_driver()
>      driver_register()
>        bus_add_driver()
>          priv = kzalloc(...) # OOM happened
>    # return without remove property directory
> 
> Fix by remove property directory when tb_register_service_driver() returns
> error.
> 
> Fixes: e69b6c02b4c3 ("net: Add support for networking over Thunderbolt cable")
> Signed-off-by: Yuan Can <yuancan@...wei.com>

Acked-by: Mika Westerberg <mika.westerberg@...ux.intel.com>