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Donenfeld" , Jakub Kicinski , Sasha Levin Subject: [PATCH 5.10 453/663] wireguard: device: do not generate ICMP for non-IP packets Date: Mon, 1 Mar 2021 17:11:41 +0100 Message-Id: <20210301161204.304229512@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210301161141.760350206@linuxfoundation.org> References: <20210301161141.760350206@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Jason A. Donenfeld [ Upstream commit 99fff5264e7ab06f45b0ad60243475be0a8d0559 ] If skb->protocol doesn't match the actual skb->data header, it's probably not a good idea to pass it off to icmp{,v6}_ndo_send, which is expecting to reply to a valid IP packet. So this commit has that early mismatch case jump to a later error label. Fixes: e7096c131e51 ("net: WireGuard secure network tunnel") Signed-off-by: Jason A. Donenfeld Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/wireguard/device.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) -- 2.27.0 diff --git a/drivers/net/wireguard/device.c b/drivers/net/wireguard/device.c index c9f65e96ccb04..c1fd3e04dd3ba 100644 --- a/drivers/net/wireguard/device.c +++ b/drivers/net/wireguard/device.c @@ -138,7 +138,7 @@ static netdev_tx_t wg_xmit(struct sk_buff *skb, struct net_device *dev) else if (skb->protocol == htons(ETH_P_IPV6)) net_dbg_ratelimited("%s: No peer has allowed IPs matching %pI6\n", dev->name, &ipv6_hdr(skb)->daddr); - goto err; + goto err_icmp; } family = READ_ONCE(peer->endpoint.addr.sa_family); @@ -201,12 +201,13 @@ static netdev_tx_t wg_xmit(struct sk_buff *skb, struct net_device *dev) err_peer: wg_peer_put(peer); -err: - ++dev->stats.tx_errors; +err_icmp: if (skb->protocol == htons(ETH_P_IP)) icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); else if (skb->protocol == htons(ETH_P_IPV6)) icmpv6_ndo_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); +err: + ++dev->stats.tx_errors; kfree_skb(skb); return ret; }