Messages in this thread | | | From | Fabio Estevam <> | Date | Mon, 26 Apr 2021 08:57:38 -0300 | Subject | Re: [PATCH 2/2] tty: serial: fsl_lpuart: fix the potential bug of dereference null return value |
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Hi Sherry,
On Mon, Apr 26, 2021 at 8:39 AM Sherry Sun <sherry.sun@nxp.com> wrote:
> > > + if (!sdata) > > > + return -ENODEV; > > > > How can sdata be NULL? > > Is it possible that a case forgot to set sdata? Then the value will be NULL, such as { .compatible = "fsl,imx8qxp-lpuart", }. > So I added the patch to avoid the kernel crash when run to sdata->reg_off directly. But I am not sure does it make sense.
sdata comes directly from of_device_get_match_data().
This driver only runs on DT platforms and the only way of being probed is when a compatible string matches, so it is not possible that sdata can be NULL.
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