On Thu, 29 Mar 2018 11:39:41 +0200
Greg Kurz <gr...@kaod.org> wrote:
> On Thu, 29 Mar 2018 11:27:21 +0200
> Igor Mammedov <imamm...@redhat.com> wrote:
>
> > On Thu, 29 Mar 2018 11:10:06 +0200
> > Greg Kurz <gr...@kaod.org> wrote:
> >
> > > The string returned by object_property_get_str() is dynamically allocated.
> > >
> > > Fixes: 3c4e9baacf4d9
> > > Signed-off-by: Greg Kurz <gr...@kaod.org>
> > > ---
> > > hw/s390x/s390-virtio-ccw.c | 5 ++++-
> > > 1 file changed, 4 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
> > > index 864145a7c6f3..435f7c99e77c 100644
> > > --- a/hw/s390x/s390-virtio-ccw.c
> > > +++ b/hw/s390x/s390-virtio-ccw.c
> > > @@ -246,6 +246,7 @@ static void s390_init_ipl_dev(const char
> > > *kernel_filename,
> > > {
> > > Object *new = object_new(TYPE_S390_IPL);
> > > DeviceState *dev = DEVICE(new);
> > > + char *netboot_fw_prop;
> > >
> > > if (kernel_filename) {
> > > qdev_prop_set_string(dev, "kernel", kernel_filename);
> > > @@ -256,9 +257,11 @@ static void s390_init_ipl_dev(const char
> > > *kernel_filename,
> > > qdev_prop_set_string(dev, "cmdline", kernel_cmdline);
> > > qdev_prop_set_string(dev, "firmware", firmware);
> > > qdev_prop_set_bit(dev, "enforce_bios", enforce_bios);
> > > - if (!strlen(object_property_get_str(new, "netboot_fw",
> > > &error_abort))) {
> > > + netboot_fw_prop = object_property_get_str(new, "netboot_fw",
> > > &error_abort);
> > > + if (!strlen(netboot_fw_prop)) {
> > probably not really issue here but,
> > is strlen really safe in case netboot_fw_prop == NULL?
> >
>
> You're right, object_property_get_str() can theoretically return NULL and
> strlen() would crash... Not sure how this would happen though. Anyway, the
> current code doesn't check if object_property_get_str() returns NULL so
> if this needs to be fixed as well, let's do it in a followup patch.
I don't think so - if the attribute exists, we'll always get != NULL if
I read the code correctly.
>
> > > qdev_prop_set_string(dev, "netboot_fw", netboot_fw);
> > > }
> > > + g_free(netboot_fw_prop);
> > > object_property_add_child(qdev_get_machine(), TYPE_S390_IPL,
> > > new, NULL);
> > > object_unref(new);
> > >
> > >
> >
>
