netdev - Re: [PATCH wpan] mac802154: fix missing INIT_LIST_HEAD in ieee802154_if

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Date:   Mon, 5 Dec 2022 09:58:39 +0100
From:   Stefan Schmidt <stefan@...enfreihafen.org>
To:     Alexander Aring <aahringo@...hat.com>,
        Wei Yongjun <weiyongjun@...weicloud.com>
Cc:     Alexander Aring <alex.aring@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Marcel Holtmann <marcel@...tmann.org>,
        Wei Yongjun <weiyongjun1@...wei.com>,
        linux-wpan@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH wpan] mac802154: fix missing INIT_LIST_HEAD in
 ieee802154_if_add()

Hello.

On 04.12.22 23:49, Alexander Aring wrote:
> Hi,
> 
> On Wed, Nov 30, 2022 at 4:19 AM Wei Yongjun <weiyongjun@...weicloud.com> wrote:
>>
>> From: Wei Yongjun <weiyongjun1@...wei.com>
>>
>> Kernel fault injection test reports null-ptr-deref as follows:
>>
>> BUG: kernel NULL pointer dereference, address: 0000000000000008
>> RIP: 0010:cfg802154_netdev_notifier_call+0x120/0x310 include/linux/list.h:114
>> Call Trace:
>>   <TASK>
>>   raw_notifier_call_chain+0x6d/0xa0 kernel/notifier.c:87
>>   call_netdevice_notifiers_info+0x6e/0xc0 net/core/dev.c:1944
>>   unregister_netdevice_many_notify+0x60d/0xcb0 net/core/dev.c:1982
>>   unregister_netdevice_queue+0x154/0x1a0 net/core/dev.c:10879
>>   register_netdevice+0x9a8/0xb90 net/core/dev.c:10083
>>   ieee802154_if_add+0x6ed/0x7e0 net/mac802154/iface.c:659
>>   ieee802154_register_hw+0x29c/0x330 net/mac802154/main.c:229
>>   mcr20a_probe+0xaaa/0xcb1 drivers/net/ieee802154/mcr20a.c:1316
>>
>> ieee802154_if_add() allocates wpan_dev as netdev's private data, but not
>> init the list in struct wpan_dev. cfg802154_netdev_notifier_call() manage
>> the list when device register/unregister, and may lead to null-ptr-deref.
>>
>> Use INIT_LIST_HEAD() on it to initialize it correctly.
>>
>> Fixes: fcf39e6e88e9 ("ieee802154: add wpan_dev_list")
>> Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
> 
> Nice catch. :)
> 
> Acked-by: Alexander Aring <aahringo@...hat.com>


This patch has been applied to the wpan tree and will be
part of the next pull request to net. Thanks!

regards
Stefan Schmidt