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Date:   Tue, 6 Jun 2023 16:37:49 +0300
From:   Tony Lindgren <tony@atomide.com>
To:     Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc:     Dan Carpenter <dan.carpenter@linaro.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jiri Slaby <jirislaby@kernel.org>,
        linux-serial@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: Re: [PATCH] serial: core: don't kfree device managed data
Message-ID: <20230606133749.GK56720@atomide.com>
References: <ZH7tsTmWY5b/4m+6@moroto>
 <ZH8xwKuI9WqRUu5H@smile.fi.intel.com>
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* Andy Shevchenko <andriy.shevchenko@linux.intel.com> [230606 13:16]:
> On Tue, Jun 06, 2023 at 11:26:25AM +0300, Dan Carpenter wrote:
> > The put_device() function will call serial_base_ctrl_release() or
> > serial_base_port_release() so these kfrees() are a double free bug.
> 
> ...
> 
> These labels are also called without device being even added.
> So, this is not good enough as far as I can tell.

I guess you mean the possibe error returned from the call to
serial_base_device_init()?

If serial_base_device_init() fails, we return error and end up doing
the put_device().

We have serial_base_device_init() call device_initialize(), is that
not enough for put_device()?

Regards,

Tony