netdev - Re: [PATCH wpan 1/4] net: ieee802154: fix nl802154 del llsec key

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Message-ID: <469c5201-a93e-a3d5-1b0c-39519f4e267e@datenfreihafen.org>
Date:   Wed, 24 Feb 2021 14:37:19 +0100
From:   Stefan Schmidt <stefan@...enfreihafen.org>
To:     Alexander Aring <aahringo@...hat.com>
Cc:     linux-wpan@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH wpan 1/4] net: ieee802154: fix nl802154 del llsec key

Hello.

On 21.02.21 18:43, Alexander Aring wrote:
> This patch fixes a nullpointer dereference if NL802154_ATTR_SEC_KEY is
> not set by the user. If this is the case nl802154 will return -EINVAL.
> 
> Reported-by: syzbot+ac5c11d2959a8b3c4806@...kaller.appspotmail.com
> Signed-off-by: Alexander Aring <aahringo@...hat.com>
> ---
>   net/ieee802154/nl802154.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c
> index 7c5a1aa5adb4..2f0a138bd5eb 100644
> --- a/net/ieee802154/nl802154.c
> +++ b/net/ieee802154/nl802154.c
> @@ -1592,7 +1592,8 @@ static int nl802154_del_llsec_key(struct sk_buff *skb, struct genl_info *info)
>   	struct nlattr *attrs[NL802154_KEY_ATTR_MAX + 1];
>   	struct ieee802154_llsec_key_id id;
>   
> -	if (nla_parse_nested_deprecated(attrs, NL802154_KEY_ATTR_MAX, info->attrs[NL802154_ATTR_SEC_KEY], nl802154_key_policy, info->extack))
> +	if (!info->attrs[NL802154_ATTR_SEC_KEY] ||
> +	    nla_parse_nested_deprecated(attrs, NL802154_KEY_ATTR_MAX, info->attrs[NL802154_ATTR_SEC_KEY], nl802154_key_policy, info->extack))
>   		return -EINVAL;
>   
>   	if (ieee802154_llsec_parse_key_id(attrs[NL802154_KEY_ATTR_ID], &id) < 0)
> 

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

regards
Stefan Schmidt