Subject: Re: [PATCH] mac802154: add a check for slave data list before delete

From: Miquel Raynal <[email-masked]>
Date: Tue, 12 Nov 2024 12:01:21 +0100

On 12/11/2024 at 08:21:33 +08, Lizhi Xu <[email-masked]> wrote:

> On Mon, 11 Nov 2024 20:46:57 +0100, Miquel Raynal wrote:
>> On 08/11/2024 at 22:54:20 +08, Lizhi Xu <[email-masked]> wrote:
>> 
>> > syzkaller reported a corrupted list in ieee802154_if_remove. [1]
>> >
>> > Remove an IEEE 802.15.4 network interface after unregister an IEEE 802.15.4
>> > hardware device from the system.
>> >
>> > CPU0					CPU1
>> > ====					====
>> > genl_family_rcv_msg_doit		ieee802154_unregister_hw
>> > ieee802154_del_iface			ieee802154_remove_interfaces
>> > rdev_del_virtual_intf_deprecated	list_del(&sdata->list)
>> > ieee802154_if_remove
>> > list_del_rcu
>> 
>> FYI this is a "duplicate" but with a different approach than:
>> https://lore.kernel.org/linux-wpan/[email-masked]/T/#m02cebe86ec0171fc4d3350676bbdd4a7e3827077
> No, my patch was the first to fix it, someone else copied my
> patch. Here is my patch:

Ok, so same question as to the other contributor, why not enclosing the
remaining list_del_rcu() within mutex protection? Can we avoid the
creation of the LISTDONE state bit?

Thanks,
Miquèl