Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:7 as permitted sender) client-ip=2620:137:e000::3:7;
Date:   Sat, 7 Oct 2023 08:44:27 +0200
From:   Greg KH <gregkh@linuxfoundation.org>
To:     Kassey Li <quic_yingangl@quicinc.com>
Cc:     gregkh@google.com, cmllamas@google.com, surenb@google.com,
        arve@android.com, joel@joelfernandes.org, brauner@kernel.org,
        tkjos@android.com, maco@android.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] binder: add mutex_lock for mmap and NULL when free
Message-ID: <2023100715-blade-valiant-714d@gregkh>
References: <20231007034046.2352124-1-quic_yingangl@quicinc.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20231007034046.2352124-1-quic_yingangl@quicinc.com>
Precedence: bulk

On Sat, Oct 07, 2023 at 11:40:46AM +0800, Kassey Li wrote:
> Enforce alloc->mutex in binder_alloc_mmap_handler when add
> the entry to list.
> 
> Assign the freed pages/page_ptr to NULL to catch possible
> use after free with NULL pointer access.
> 
> Signed-off-by: Kassey Li <quic_yingangl@quicinc.com>
> ---
>  drivers/android/binder_alloc.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)

What commit id does this fix?

thanks,

greg k-h