linux-kernel - Re: [PATCH] mac802154: add a check for slave data list before delete

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Message-ID: <130193b3-6172-4fb0-b799-4e05d676f1dd@yandex.ru>
Date: Wed, 13 Nov 2024 15:45:36 +0300
From: Dmitry Antipov <dmantipov@...dex.ru>
To: Miquel Raynal <miquel.raynal@...tlin.com>
Cc: Lizhi Xu <lizhi.xu@...driver.com>, alex.aring@...il.com,
 davem@...emloft.net, edumazet@...gle.com, horms@...nel.org, kuba@...nel.org,
 linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
 linux-wpan@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com,
 stefan@...enfreihafen.org,
 syzbot+985f827280dc3a6e7e92@...kaller.appspotmail.com,
 syzkaller-bugs@...glegroups.com
Subject: Re: [PATCH] mac802154: add a check for slave data list before delete

On 11/13/24 1:58 PM, Miquel Raynal wrote:

>> Note https://syzkaller.appspot.com/text?tag=ReproC&x=12a9f740580000 makes an
>> attempt to connect the only device. How this is expected to work if there are
>> more than one device?
> 
> Isn't sdata already specific enough? What do you mean by "device"?

Well, syzbot's reproducer triggers this issue via USB Raw Gadget API. IIUC this
is a debugging feature and it is possible to have the only raw gadget device.
So when running syzbot's reproducer, 'list_count_nodes(&sdata->local->interfaces)'
is always <= 1. But how this is expected to work for >1 case?

Dmitry