Re: [PATCH] pinctrl: mcp23s08: use struct_size() in devm_kzalloc()

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Fri, Jan 4, 2019 at 6:37 PM Gustavo A. R. Silva
<gustavo@xxxxxxxxxxxxxx> wrote:

> One of the more common cases of allocation size calculations is finding
> the size of a structure that has a zero-sized array at the end, along
> with memory for some number of elements for that array. For example:
>
> struct foo {
>     int stuff;
>     void *entry[];
> };
>
> instance = devm_kzalloc(dev, sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL);
>
> Instead of leaving these open-coded and prone to type mistakes, we can
> now use the new struct_size() helper:
>
> instance = devm_kzalloc(dev, struct_size(instance, entry, count), GFP_KERNEL);
>
> This code was detected with the help of Coccinelle.
>
> Signed-off-by: Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>

Patch applied.

Yours,
Linus Walleij