From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AIpwx4/aApiSryEzDgFAVWXZCM9Awua3MOzAugHwoWaexwpBJ/Oxzk+4xBOKXOxUfNjAhrHar8uH ARC-Seal: i=1; a=rsa-sha256; t=1523399948; cv=none; d=google.com; s=arc-20160816; b=l7r+ry/bn0bCebCSxonkL5F8tPjfORS/tWAAj4eAe3Hey65zwUOHgkmwMYSHSWm020 szFZrprlift/DtU1HugeTlUBPJHwVsua+Ed9OIzRtRvz4x7IQ+bl6mfrtNs1ZVy6qI82 e65FYEMZKK0W6slSJ/80stfj1Eohhjq7wRREaUctLC4XWEfeC2kzVN0OGgm45mrqdx3H iI4c7w3C5jPMMngYnvKopVr7alikiahOv8k8yT+isZBjA41D1mUDZ+8DHw+no1doS3SA 3KG4TSADVC2+9MxML9L0A1CPAsARapOPrT9lafjeL3hT1nVTGrYJ4/GEnkk3f53L5b66 itcg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:arc-authentication-results; bh=fZ7VWn7KO7U3UeuuOlojxhtaEXP2fXwM7qS18TNcS1Y=; b=aJJgWI2XsyuZKbaKJMDJCSRm81gVGncPxDSiOTurqVoAs8y1/HyqdtgXdMnaZM+2hu Wp60lZCTu3tPRnpC4A0JfTcDl9NAgyeeuGgk4VZ+PEmUrWc3C0aL2717sL42v/JUVAH4 dajB84+sJ+7h/QAaK1skOQDuK7ccZJs1iBbRH+mlElnZ2poC8m9QMpBsqe3VcJhqlvud 7pmoaeuUqcIZKKf2ezhaF1m4vXppo7fnk2MY6DeBfumnSTaaUmcguct5efHI1ytgzuYy 9hELV3HBy6QKNls+0s054bXMSgpcg3Z3kKuSXLYAdes87zm8NE5MAgJ67Ey1w35nwj5L tp9w== ARC-Authentication-Results: i=1; mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.61.202 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.61.202 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Eric Dumazet , "David S. Miller" Subject: [PATCH 4.14 121/138] ip6_tunnel: better validate user provided tunnel names Date: Wed, 11 Apr 2018 00:25:11 +0200 Message-Id: <20180410212916.268036160@linuxfoundation.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180410212902.121524696@linuxfoundation.org> References: <20180410212902.121524696@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1597399698628036818?= X-GMAIL-MSGID: =?utf-8?q?1597400624172377390?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Dumazet [ Upstream commit db7a65e3ab78e5b1c4b17c0870ebee35a4ee3257 ] Use valid_name() to make sure user does not provide illegal device name. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/ipv6/ip6_tunnel.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) --- a/net/ipv6/ip6_tunnel.c +++ b/net/ipv6/ip6_tunnel.c @@ -297,13 +297,16 @@ static struct ip6_tnl *ip6_tnl_create(st struct net_device *dev; struct ip6_tnl *t; char name[IFNAMSIZ]; - int err = -ENOMEM; + int err = -E2BIG; - if (p->name[0]) + if (p->name[0]) { + if (!dev_valid_name(p->name)) + goto failed; strlcpy(name, p->name, IFNAMSIZ); - else + } else { sprintf(name, "ip6tnl%%d"); - + } + err = -ENOMEM; dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, ip6_tnl_dev_setup); if (!dev)