linux-kernel - Re: [PATCH v3] drivers/tty/serial: check the return value of uart_port

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Date:   Sun, 4 Sep 2022 08:20:09 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Li Zhong <floridsleeves@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
        jirislaby@...nel.org
Subject: Re: [PATCH v3] drivers/tty/serial: check the return value of
 uart_port_check()

On Sat, Sep 03, 2022 at 05:45:24PM -0700, Li Zhong wrote:
> uart_port_check() will return NULL pointer when state->uart_port is
> NULL. Check the return value before dereference it to avoid
> null-pointer-dereference error because the locking does not guarantee
> the return value is not NULL. Here we do not need unlock in the error
> handling because the mutex_unlock() is called in callers.
> 
> Signed-off-by: Li Zhong <floridsleeves@...il.com>
> ---
> 
> v3: Add the reason why we need to check the NULL value in the commit
> message.  The bug is detected by static analysis.

Great, then please follow the rules in
Documentation/process/researcher-guidelines.rst and identify the tools
you are using as well as everything else listed there.

thanks,

greg k-h