netdev - unregister_netdev() deadlock

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 27 Feb 2008 15:44:54 +0000
From:	Jeba Anandhan <jeba.anandhan@...oni.com>
To:	netdev@...r.kernel.org
Cc:	matthew.hattersley@...oni.com
Subject: unregister_netdev() deadlock

Hi all,
I have doubts about unregister the netdevice.

Scenario
I have two netdevice entities. I wish to unregister one entity.

struct net_device *dev1;
struct net_device *dev2;

dev1->timer = XXX;
dev2->timer = YYY;

dev1->ioctl() {

...
case delete_other:
            unregister_netdev(dev2);
            free_netdev(dev2);
            return 0;
...
}

The dev2->refcnt is not zero in this case. unregister_netdev(dev2) cause
deadlock. Could you tell me why it happens?.

It works smoothly when we call the unregister_netdev(dev2) from
cleanup_module(). dev2->refcnt is not zero in this case.  Still it is
able to unregister.

Thanks
Jeba

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html