netdev - Re: [PATCH net] ieee802154: Prevent user from crashing the host

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Message-ID: <20230302094848.206f35ae@xps-13>
Date:   Thu, 2 Mar 2023 09:48:48 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org
Cc:     Alexander Aring <alex.aring@...il.com>,
        Stefan Schmidt <stefan@...enfreihafen.org>,
        linux-wpan@...r.kernel.org,
        David Girault <david.girault@...vo.com>,
        Romuald Despres <romuald.despres@...vo.com>,
        Frederic Blain <frederic.blain@...vo.com>,
        Nicolas Schodet <nico@...fr.eu.org>,
        Guilhem Imberton <guilhem.imberton@...vo.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Sanan Hasanov <sanan.hasanov@...ghts.ucf.edu>
Subject: Re: [PATCH net] ieee802154: Prevent user from crashing the host

Hello,

miquel.raynal@...tlin.com wrote on Wed,  1 Mar 2023 16:44:50 +0100:

> Avoid crashing the machine by checking
> info->attrs[NL802154_ATTR_SCAN_TYPE] presence before de-referencing it,
> which was the primary intend of the blamed patch.

Subject should have been wpan instead of net, sorry for the confusion.

> Reported-by: Sanan Hasanov <sanan.hasanov@...ghts.ucf.edu>
> Suggested-by: Eric Dumazet <edumazet@...gle.com>
> Fixes: a0b6106672b5 ("ieee802154: Convert scan error messages to extack")
> Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
> ---
>  net/ieee802154/nl802154.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c
> index 88380606af2c..a18fb98a4b09 100644
> --- a/net/ieee802154/nl802154.c
> +++ b/net/ieee802154/nl802154.c
> @@ -1412,7 +1412,7 @@ static int nl802154_trigger_scan(struct sk_buff *skb, struct genl_info *info)
>  		return -EOPNOTSUPP;
>  	}
>  
> -	if (!nla_get_u8(info->attrs[NL802154_ATTR_SCAN_TYPE])) {
> +	if (!info->attrs[NL802154_ATTR_SCAN_TYPE]) {
>  		NL_SET_ERR_MSG(info->extack, "Malformed request, missing scan type");
>  		return -EINVAL;
>  	}


Thanks,
Miquèl