Re: sizeof *data, when data isn't initalized, is that right?

[Hubert CHAUMETTE <hubert.chaumette@wanadoo.fr>]

Hi,

As I understand it, sizeof(*data) is the same as sizeof(struct mcp23s08_driver_data). There should be no pointer dereference here, so I would say it isn't an issue. That notation is quite confusing though.
Note that data is surrounded by parenthesis, at least in Linux 3.18, in gpio-mcp23s08.c
Regards,

Hubert

Le 22/01/2015 19:19, Daniel Hilst Selli a écrit :
> I came across this code:
>
>         struct mcp23s08_driver_data     *data;
>     ...
>     data = kzalloc(sizeof *data + chips * sizeof(struct mcp23s08),
>                         GFP_KERNEL);
>
>
> Since data wasn't initialized when `sizeof *data' is called, wasn't this a non-initialized pointer dereference?
>
> Cheers
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