| Message ID | 20210616020901.2759466-1-mudongliangabcd@gmail.com (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
| Series | [v2] ieee802154: hwsim: Fix memory leak in hwsim_add_one | expand |
Hi, On Tue, 15 Jun 2021 at 22:09, Dongliang Mu <mudongliangabcd@gmail.com> wrote: > > No matter from hwsim_remove or hwsim_del_radio_nl, hwsim_del fails to > remove the entry in the edges list. Take the example below, phy0, phy1 > and e0 will be deleted, resulting in e1 not freed and accessed in the > future. > > hwsim_phys > | > ------------------------------ > | | > phy0 (edges) phy1 (edges) > ----> e1 (idx = 1) ----> e0 (idx = 0) > > Fix this by deleting and freeing all the entries in the edges list > between hwsim_edge_unsubscribe_me and list_del(&phy->list). > > Reported-by: syzbot+b80c9959009a9325cdff@syzkaller.appspotmail.com > Fixes: 1c9f4a3fce77 ("ieee802154: hwsim: fix rcu handling") > Signed-off-by: Dongliang Mu <mudongliangabcd@gmail.com> Acked-by: Alexander Aring <aahringo@redhat.com> Thanks!
Hello. On 22.06.21 20:29, Alexander Aring wrote: > Hi, > > On Tue, 15 Jun 2021 at 22:09, Dongliang Mu <mudongliangabcd@gmail.com> wrote: >> >> No matter from hwsim_remove or hwsim_del_radio_nl, hwsim_del fails to >> remove the entry in the edges list. Take the example below, phy0, phy1 >> and e0 will be deleted, resulting in e1 not freed and accessed in the >> future. >> >> hwsim_phys >> | >> ------------------------------ >> | | >> phy0 (edges) phy1 (edges) >> ----> e1 (idx = 1) ----> e0 (idx = 0) >> >> Fix this by deleting and freeing all the entries in the edges list >> between hwsim_edge_unsubscribe_me and list_del(&phy->list). >> >> Reported-by: syzbot+b80c9959009a9325cdff@syzkaller.appspotmail.com >> Fixes: 1c9f4a3fce77 ("ieee802154: hwsim: fix rcu handling") >> Signed-off-by: Dongliang Mu <mudongliangabcd@gmail.com> > > Acked-by: Alexander Aring <aahringo@redhat.com> > > Thanks! This patch has been applied to the wpan tree and will be part of the next pull request to net. Thanks! regards Stefan Schmidt
diff --git a/drivers/net/ieee802154/mac802154_hwsim.c b/drivers/net/ieee802154/mac802154_hwsim.c index da9135231c07..cf659361a3fb 100644 --- a/drivers/net/ieee802154/mac802154_hwsim.c +++ b/drivers/net/ieee802154/mac802154_hwsim.c @@ -824,12 +824,17 @@ static int hwsim_add_one(struct genl_info *info, struct device *dev, static void hwsim_del(struct hwsim_phy *phy) { struct hwsim_pib *pib; + struct hwsim_edge *e; hwsim_edge_unsubscribe_me(phy); list_del(&phy->list); rcu_read_lock(); + list_for_each_entry_rcu(e, &phy->edges, list) { + list_del_rcu(&e->list); + hwsim_free_edge(e); + } pib = rcu_dereference(phy->pib); rcu_read_unlock();
No matter from hwsim_remove or hwsim_del_radio_nl, hwsim_del fails to remove the entry in the edges list. Take the example below, phy0, phy1 and e0 will be deleted, resulting in e1 not freed and accessed in the future. hwsim_phys | ------------------------------ | | phy0 (edges) phy1 (edges) ----> e1 (idx = 1) ----> e0 (idx = 0) Fix this by deleting and freeing all the entries in the edges list between hwsim_edge_unsubscribe_me and list_del(&phy->list). Reported-by: syzbot+b80c9959009a9325cdff@syzkaller.appspotmail.com Fixes: 1c9f4a3fce77 ("ieee802154: hwsim: fix rcu handling") Signed-off-by: Dongliang Mu <mudongliangabcd@gmail.com> --- v1->v2: add rcu_read_lock for the deletion operation according to Pavel Skripkin drivers/net/ieee802154/mac802154_hwsim.c | 5 +++++ 1 file changed, 5 insertions(+)