linux-kernel - Re: [PATCH v6 RESEND] misc: sgi-gru: fix use-after-free error in gru_set_context_option, gru_fault and gru_handle_user_call

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Date:   Wed, 9 Nov 2022 10:35:54 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Zheng Hacker <hackerzheng666@...il.com>
Cc:     Zheng Wang <zyytlz.wz@....com>, zhengyejian1@...wei.com,
        dimitri.sivanich@....com, arnd@...db.de,
        linux-kernel@...r.kernel.org, alex000young@...il.com,
        security@...nel.org, sivanich@....com, lkp@...el.com
Subject: Re: [PATCH v6 RESEND] misc: sgi-gru: fix use-after-free error in
 gru_set_context_option, gru_fault and gru_handle_user_call_os

On Wed, Nov 09, 2022 at 05:24:05PM +0800, Zheng Hacker wrote:
> Greg KH <gregkh@...uxfoundation.org> 于2022年11月9日周三 16:46写道：
> >
> > On Wed, Nov 09, 2022 at 04:41:42PM +0800, Zheng Wang wrote:
> > > Gts may be freed in gru_check_chiplet_assignment.
> > > The caller still use it after that, UAF happens.
> > >
> > > Fix it by introducing a return value to see if it's in error path or not.
> > > Free the gts in caller if gru_check_chiplet_assignment check failed.
> > >
> > > Fixes: 55484c45dbec ("gru: allow users to specify gru chiplet 2")
> > > Reported-by: Zheng Wang <hackerzheng666@...il.com>
> > > Reported-by: kernel test robot <lkp@...el.com>
> > >
> >
> > Why the blank line?
> 
> > Sorry for the spelling problem, fixed it next version
> 
> > And the kernel test robot didn't find this issue, right?
> >
> 
> Yes, it helped with the test and found an unused variable. I added
> this line as the mail suggested
> ("If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <lkp@...el.com>").
> 
> Should I remove it?

If you submit a patch that just fixes the issue that the test robot
finds, yes, that needs to be there.  If you are fixing up a patch that
you submit based on the report, no, you do not.

thanks,

greg k-h