Messages in this thread | | | Date | Thu, 6 Jan 2022 16:01:20 +0100 | From | Greg KH <> | Subject | Re: [PATCH] tty/serial: Check for null pointer after calling devm_ioremap |
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On Thu, Jan 06, 2022 at 05:06:31PM +0800, Jiasheng Jiang wrote: > As the possible failure of the allocation, the devm_ioremap() may return > NULL pointer.
I do not understand this sentence.
> And the 'port->membase' will be directly used in mlb_usio_startup().
This does not make sense either.
> Therefore, in order to avoid the dereference of the NULL pointer, it > should be better to add the sanity check.
What do you mean by "sanity check"?
confused,
greg k-h
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