linux-kernel - Re: dell_smbios KASAN bug

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Date:   Wed, 20 Mar 2019 15:45:34 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Tom Zanussi <tzanussi@...il.com>
Cc:     Pali Rohár <pali.rohar@...il.com>,
        Mario Limonciello <mario.limonciello@...l.com>,
        linux-kernel@...r.kernel.org
Subject: Re: dell_smbios KASAN bug

On Wed, 20 Mar 2019 14:30:21 -0500
Tom Zanussi <tzanussi@...il.com> wrote:

> > diff --git a/drivers/platform/x86/dell-smbios-base.c
> > b/drivers/platform/x86/dell-smbios-base.c
> > index 9dc282ed5a9e..c3825c674522 100644
> > --- a/drivers/platform/x86/dell-smbios-base.c
> > +++ b/drivers/platform/x86/dell-smbios-base.c
> > @@ -619,6 +619,7 @@ static int __init dell_smbios_init(void)
> >  
> >  fail_platform_driver:
> >  	kfree(da_tokens);
> > +	da_num_tokens = 0;
> >  	return ret;
> >  }
> >    
> 
> 
> Unfortunately, no.

That's really weird. I would recommend throwing in a bunch of printks
to see if things are being freed and set, to make sure this code is hit
and something else isn't just corrupting it.

-- Steve