linux-kernel - Re: [PATCH] clk: core: Copy connection id

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Date:   Sat, 25 Feb 2017 09:20:02 +0000
From:   Leonard Crestez <leonard.crestez@....com>
To:     "sboyd@...eaurora.org" <sboyd@...eaurora.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mturquette@...libre.com" <mturquette@...libre.com>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>
Subject: Re: [PATCH] clk: core: Copy connection id

On Fri, 2017-02-24 at 12:44 -0800, Stephen Boyd wrote:
> On 02/20, Leonard Crestez wrote:
> > Some drivers use sprintf to build clk connection id names but the
> > clk
> > core will save those strings and occasionally print them back.
> > Duplicate
> > the con_id strings instead of fixing all the users.
> 
> Good catch. What about dev_id though? That could also have the
> same problem if some device is removed and we're still holding a
> reference to the kobject's name. This is probably more rare than
> what is happening here, but still seems possible that we might
> trip over that later.

A device should normally free the clks it uses before it is destroyed.
This means that if dev_id is pointing to freed memory then the clk
itself was probably leaked, right?

This is obvious misuse of the API, not like sprintf-ing a con_id in a
complex driver. I don't really think it's worth copying strings for it.

--
Regards,
Leonard