Re: [PATCH v2][next] RDMA/core: Use size_{add,mul}() in calls to struct_size()

[Gustavo A. R. Silva]

On 9/18/23 04:49, Leon Romanovsky wrote:
> On Fri, Sep 15, 2023 at 12:06:21PM -0600, Gustavo A. R. Silva wrote:
> > On 9/14/23 21:29, Kees Cook wrote:
> > > On Mon, Sep 11, 2023 at 05:27:59PM -0600, Gustavo A. R. Silva wrote:
> > > > Harden calls to struct_size() with size_add() and size_mul().
> > >
> > > Specifically, make sure that open-coded arithmetic cannot cause an
> > > overflow/wraparound. (i.e. it will stay saturated at SIZE_MAX.)
> >
> > Yep; I have another patch where I explain this in similar terms.
> >
> > I'll send it, shortly.
>
> You missed other places with similar arithmetic.
> drivers/infiniband/core/device.c:       pdata_rcu = kzalloc(struct_size(pdata_rcu, pdata,
> drivers/infiniband/core/device.c-                                       rdma_end_port(device) + 1),
> drivers/infiniband/core/device.c-                           GFP_KERNEL);
>
> drivers/infiniband/core/sa_query.c:     sa_dev = kzalloc(struct_size(sa_dev, port, e - s + 1), GFP_KERNEL);
> drivers/infiniband/core/user_mad.c:     umad_dev = kzalloc(struct_size(umad_dev, ports, e - s + 1), GFP_KERNEL);

I haven't sent all my patches.

--
Gustavo