> miquel.raynal@xxxxxxxxxxx wrote on Date: Fri, 7 Apr 2023 10:01:48 +0200:
> > chenaotian2@xxxxxxx wrote on Fri, 7 Apr 2023 09:26:26 +0800:
> > After replacing e->info, it is necessary to free the old einfo.
> >
> > Signed-off-by: Chen Aotian <chenaotian2@xxxxxxx>
> > ---
> > drivers/net/ieee802154/mac802154_hwsim.c | 4 +++-
> > 1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/ieee802154/mac802154_hwsim.c b/drivers/net/ieee802154/mac802154_hwsim.c
> > index 8445c2189..6e7e10b17 100644
> > --- a/drivers/net/ieee802154/mac802154_hwsim.c
> > +++ b/drivers/net/ieee802154/mac802154_hwsim.c
> > @@ -685,7 +685,7 @@ static int hwsim_del_edge_nl(struct sk_buff *msg, struct genl_info *info)
> > static int hwsim_set_edge_lqi(struct sk_buff *msg, struct genl_info *info)
> > {
> > struct nlattr *edge_attrs[MAC802154_HWSIM_EDGE_ATTR_MAX + 1];
> > - struct hwsim_edge_info *einfo;
> > + struct hwsim_edge_info *einfo, *einfo_old;
> > struct hwsim_phy *phy_v0;
> > struct hwsim_edge *e;
> > u32 v0, v1;
> > @@ -723,8 +723,10 @@ static int hwsim_set_edge_lqi(struct sk_buff *msg, struct genl_info *info)
> > list_for_each_entry_rcu(e, &phy_v0->edges, list) {
> > if (e->endpoint->idx == v1) {
> > einfo->lqi = lqi;
> > + einfo_old = rcu_dereference(e->info);
> > rcu_assign_pointer(e->info, einfo);
> > rcu_read_unlock();
> > + kfree_rcu(einfo_old, rcu);
> > mutex_unlock(&hwsim_phys_lock);
> > return 0;
> > }
>
> I'm not an RCU expert but the fix LGTM.
> What about adding:
> Fixes: f25da51fdc38 ("ieee802154: hwsim: add replacement for fakelb")
> Cc: stable@vger.kernelorg
Sure, I will resend this patch soon with adding those
Thanks,
Chen
