Re: [PATCH net-next] ipv4: fib: use struct_size() in kzalloc()

From: David Miller
Date: Fri Feb 01 2019 - 18:23:13 EST


From: "Gustavo A. R. Silva" <gustavo@xxxxxxxxxxxxxx>
Date: Wed, 30 Jan 2019 18:51:48 -0600

> 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;
> struct boo entry[];
> };
>
> instance = kzalloc(sizeof(struct foo) + count * sizeof(struct boo), GFP_KERNEL);
>
> Instead of leaving these open-coded and prone to type mistakes, we can
> now use the new struct_size() helper:
>
> instance = kzalloc(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>

Applied.