Hi Gustavo,
On Wed, 2019-08-28 at 13:29 -0500, Gustavo A. R. Silva wrote:
> On 5/29/19 11:53 AM, Gustavo A. R. Silva 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;
> > 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 <gust...@embeddedor.com>
> > ---
> > security/integrity/ima/ima_template.c | 5 ++---
> > 1 file changed, 2 insertions(+), 3 deletions(-)
> >
> > diff --git a/security/integrity/ima/ima_template.c
> > b/security/integrity/ima/ima_template.c
> > index b631b8bc7624..b945dff2ed14 100644
> > --- a/security/integrity/ima/ima_template.c
> > +++ b/security/integrity/ima/ima_template.c
> > @@ -281,9 +281,8 @@ static int ima_restore_template_data(struct
> > ima_template_desc *template_desc,
> > int ret = 0;
> > int i;
> >
> > - *entry = kzalloc(sizeof(**entry) +
> > - template_desc->num_fields * sizeof(struct ima_field_data),
> > - GFP_NOFS);
> > + *entry = kzalloc(struct_size(*entry, template_data,
> > + template_desc->num_fields), GFP_NOFS);
> > if (!*entry)
> > return -ENOMEM;
> >
> >
The same usage exists in ima_api.c: ima_alloc_init_template(). Did
you want to make the change there as well?
thanks,
Mimi
