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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Marcel Holtmann , linux-wpan@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, syzbot+36256deb69a588e9290e@syzkaller.appspotmail.com, Yousef Alhouseen Subject: [PATCH net] mac802154: wait for RCU readers when removing interfaces Date: Tue, 30 Jun 2026 23:18:08 +0200 Message-ID: <20260630211808.50440-1-alhouseenyousef@gmail.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Queue wake, stop, and disable paths walk local->interfaces under RCU. The bulk hardware teardown path removes entries with list_del() and immediately unregisters their netdevices, so an asynchronous transmit completion can follow a poisoned list node in ieee802154_wake_queue(). Match ieee802154_if_remove(): use list_del_rcu() and wait for existing readers before unregistering each interface. Fixes: 592dfbfc72f5 ("mac820154: move interface unregistration into iface") Reported-by: syzbot+36256deb69a588e9290e@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=36256deb69a588e9290e Cc: stable@vger.kernel.org Signed-off-by: Yousef Alhouseen --- net/mac802154/iface.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/mac802154/iface.c b/net/mac802154/iface.c index 000be60d9580..73d82a015184 100644 --- a/net/mac802154/iface.c +++ b/net/mac802154/iface.c @@ -703,7 +703,8 @@ void ieee802154_remove_interfaces(struct ieee802154_local *local) mutex_lock(&local->iflist_mtx); list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { - list_del(&sdata->list); + list_del_rcu(&sdata->list); + synchronize_rcu(); unregister_netdevice(sdata->dev); } -- 2.55.0