On Thu, Aug 23, 2018 at 07:56:12PM -0700, Kees Cook wrote:
> On Thu, Aug 23, 2018 at 6:05 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 issue was detected with the help of Coccinelle.
> >
> > Signed-off-by: Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>
>
> Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
Applied, thanks!
Maxime
--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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