linux-kernel - Re: [PATCH v2 2/2] auxdisplay: charlcd: checking for pointer reference before dereferencing

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Message-ID: <CANiq72=sKCpVuAOeXGT80xkCUL-Ve-my_=Fefzp0HmmLER2D4w@mail.gmail.com>
Date:   Wed, 24 Nov 2021 12:01:51 +0100
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Luiz Sampaio <sampaio.ime@...il.com>
Cc:     Miguel Ojeda <ojeda@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] auxdisplay: charlcd: checking for pointer
 reference before dereferencing

On Tue, Nov 9, 2021 at 11:07 PM Luiz Sampaio <sampaio.ime@...il.com> wrote:
>
> Check if the pointer lcd->ops->init_display exists before dereferencing it.
> If a driver called charlcd_init() without defining the ops, this would
> return segmentation fault, as happened to me when implementing a charlcd
> driver.  Checking the pointer before dereferencing protects from
> segmentation fault.
>
> Signed-off-by: Luiz Sampaio <sampaio.ime@...il.com>

Queued up, thanks!

Cheers,
Miguel