linux-kernel - Re: [PATCH] kernel/module.c: Free lock-classes if parse

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Date:	Thu, 19 Feb 2015 01:12:33 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Andrey Tsyvarev <tsyvarev@...ras.ru>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] kernel/module.c: Free lock-classes if parse_args failed


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Tue, Jan 20, 2015 at 05:07:19PM +1030, Rusty Russell wrote:
> > Andrey Tsyvarev <tsyvarev@...ras.ru> writes:
> > > parse_args call module parameters' .set handlers, which may use locks defined in the module.
> > > So, these classes should be freed in case parse_args returns error(e.g. due to incorrect parameter passed).
> > 
> > Thanks, this seems right.  Applied.
> > 
> > But this makes me ask: where is lockdep_free_key_range() called on the
> > module init code?  It doesn't seem to be at all...
> 
> Hmm, Ingo, how does this work? The lockless class lookup in
> look_up_lock_class() very much assumes the class hash is only added too,
> but here we go wipe stuff from it.
> 
> From what I can tell, every use of lockdep_free_key_range() is broken.

indeed ...

Thanks,

	Ingo
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