Re: [PATCH v5 1/6] optee: ffa: Add NULL check in optee_ffa_lend_protmem

[Mostafa Saleh <smostafa@google.com>]

On Mon, Jun 08, 2026 at 03:16:49PM +0200, Jens Wiklander wrote:
> On Fri, Jun 5, 2026 at 2:01 PM Sebastian Ene <sebastianene@google.com> wrote:
> >
> > On Tue, May 26, 2026 at 03:19:29PM +0000, Mostafa Saleh wrote:
> > > Sashiko (locally) reports a possible null dereference under memory
> > > pressure due to the lack of validation of the allocated pointer.
> > >
> > > Fix that by adding the missing check.
> > >
> > > Signed-off-by: Mostafa Saleh <smostafa@google.com>
> > > ---
> > >  drivers/tee/optee/ffa_abi.c | 3 +++
> > >  1 file changed, 3 insertions(+)
> > >
> > > diff --git a/drivers/tee/optee/ffa_abi.c b/drivers/tee/optee/ffa_abi.c
> > > index b4372fa268d0..633715b98625 100644
> > > --- a/drivers/tee/optee/ffa_abi.c
> > > +++ b/drivers/tee/optee/ffa_abi.c
> > > @@ -698,6 +698,9 @@ static int optee_ffa_lend_protmem(struct optee *optee, struct tee_shm *protmem,
> > >       int rc;
> > >
> > >       mem_attr = kzalloc_objs(*mem_attr, ma_count);
> > > +     if (!mem_attr)
> > > +             return -ENOMEM;
> > > +
> > >       for (n = 0; n < ma_count; n++) {
> > >               mem_attr[n].receiver = mem_attrs[n] & U16_MAX;
> > >               mem_attr[n].attrs = mem_attrs[n] >> 16;
> > > --
> > > 2.54.0.746.g67dd491aae-goog
> > >
> >
> > Thanks for fixing this and for including my other patches in the series
> > Reviewed-by: Sebastian Ene <sebastianene@google.com>
> 
> Please add a Fixes: tag. This patch is independent of the others in
> the patch set, so if you send it alone with the Fixes: tag I'll pick
> it up.

I posted a v6 for this patch with the Fixes tag [1]

[1] https://lore.kernel.org/all/20260527150236.1978655-2-smostafa@google.com/

Thanks,
Mostafa

> 
> Cheers,
> Jens