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

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Message-ID: <6ff1052f-76d5-42a4-bf0c-ec587ca4faa4@yandex.ru>
Date: Wed, 13 Nov 2024 13:29:55 +0300
From: Dmitry Antipov <dmantipov@...dex.ru>
To: Lizhi Xu <lizhi.xu@...driver.com>, miquel.raynal@...tlin.com
Cc: 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 11/12/24 4:41 PM, Lizhi Xu wrote:

>   	mutex_lock(&sdata->local->iflist_mtx);
> +	if (list_empty(&sdata->local->interfaces)) {
> +		mutex_unlock(&sdata->local->iflist_mtx);
> +		return;
> +	}
>   	list_del_rcu(&sdata->list);
>   	mutex_unlock(&sdata->local->iflist_mtx);

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?

Dmitry