linux-kernel - RE: [PATCH 2/2] tty: serial: fsl_lpuart: fix the potential bug of dereference null return value

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Date:   Mon, 26 Apr 2021 12:48:38 +0000
From:   Sherry Sun <sherry.sun@....com>
To:     Fabio Estevam <festevam@...il.com>
CC:     Greg KH <gregkh@...uxfoundation.org>,
        "jirislaby@...nel.org" <jirislaby@...nel.org>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH 2/2] tty: serial: fsl_lpuart: fix the potential bug of
 dereference null return value

Hi Fabio,

> 
> > Thanks for your reply.
> > I guess you mean the of_match_table will not be NULL since it contains
> compatible, right?
> > But for the lpuart data -- struct lpuart_soc_data, won’t it meet the NULL
> case? such as { .compatible = "fsl,imx8qxp-lpuart",  }.
> > Here of_device_id won’t be NULL, but lpuart_soc_data Is NULL.
> 
> In linux-next we have:
> 
> static const struct of_device_id lpuart_dt_ids[] = { { .compatible = "fsl,vf610-
> lpuart", .data = &vf_data, }, { .compatible = "fsl,ls1021a-lpuart", .data =
> &ls1021a_data, }, { .compatible = "fsl,ls1028a-lpuart", .data =
> &ls1028a_data, }, { .compatible = "fsl,imx7ulp-lpuart", .data =
> &imx7ulp_data, }, { .compatible = "fsl,imx8qxp-lpuart", .data =
> &imx8qxp_data, }, { /* sentinel */ } };
> 
> All compatible entries have a .data field populated.
> 
> How sdata can be NULL?

You are right, seems it is impossible for us to hit this NULL. Will drop this patch.

Best regards
Sherry