linux-kernel - Re: [PATCH v7] 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 11:08:19 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Zheng Wang <zyytlz.wz@....com>
Cc:     zhengyejian1@...wei.com, dimitri.sivanich@....com, arnd@...db.de,
        linux-kernel@...r.kernel.org, hackerzheng666@...il.com,
        alex000young@...il.com, security@...nel.org, sivanich@....com,
        lkp@...el.com
Subject: Re: [PATCH v7] 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 05:33:47PM +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")
> Signed-off-by: Zheng Wang <zyytlz.wz@....com>
> Acked-by: Dimitri Sivanich <sivanich@....com>
> Tested-by: kernel test robot <lkp@...el.com>

The kernel robot did not provide a tested-by comment for this as they
did not test it.

Please never add tags that the person does not submit to you.

greg k-h