linux-kernel - Re: [PATCH] binder: add mutex_lock for mmap and NULL when free

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Message-ID: <2023100715-blade-valiant-714d@gregkh>
Date:   Sat, 7 Oct 2023 08:44:27 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Kassey Li <quic_yingangl@...cinc.com>
Cc:     gregkh@...gle.com, cmllamas@...gle.com, surenb@...gle.com,
        arve@...roid.com, joel@...lfernandes.org, brauner@...nel.org,
        tkjos@...roid.com, maco@...roid.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] binder: add mutex_lock for mmap and NULL when free

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@...cinc.com>
> ---
>  drivers/android/binder_alloc.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)

What commit id does this fix?

thanks,

greg k-h