Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756435AbbFSVWa (ORCPT ); Fri, 19 Jun 2015 17:22:30 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:51430 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753628AbbFSUip (ORCPT ); Fri, 19 Jun 2015 16:38:45 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Vittorio Gambaletta , "Eric W. Biederman" , Eric Dumazet , "David S. Miller" Subject: [PATCH 4.0 012/105] ipv4: Avoid crashing in ip_error Date: Fri, 19 Jun 2015 13:35:02 -0700 Message-Id: <20150619203558.576270816@linuxfoundation.org> X-Mailer: git-send-email 2.4.4 In-Reply-To: <20150619203558.187802739@linuxfoundation.org> References: <20150619203558.187802739@linuxfoundation.org> User-Agent: quilt/0.64 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2176 Lines: 64 4.0-stable review patch. If anyone has any objections, please let me know. ------------------ From: "Eric W. Biederman" [ Upstream commit 381c759d9916c42959515ad34a6d467e24a88e93 ] ip_error does not check if in_dev is NULL before dereferencing it. IThe following sequence of calls is possible: CPU A CPU B ip_rcv_finish ip_route_input_noref() ip_route_input_slow() inetdev_destroy() dst_input() With the result that a network device can be destroyed while processing an input packet. A crash was triggered with only unicast packets in flight, and forwarding enabled on the only network device. The error condition was created by the removal of the network device. As such it is likely the that error code was -EHOSTUNREACH, and the action taken by ip_error (if in_dev had been accessible) would have been to not increment any counters and to have tried and likely failed to send an icmp error as the network device is going away. Therefore handle this weird case by just dropping the packet if !in_dev. It will result in dropping the packet sooner, and will not result in an actual change of behavior. Fixes: 251da4130115b ("ipv4: Cache ip_error() routes even when not forwarding.") Reported-by: Vittorio Gambaletta Tested-by: Vittorio Gambaletta Signed-off-by: Vittorio Gambaletta Signed-off-by: "Eric W. Biederman" Acked-by: Eric Dumazet Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/ipv4/route.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -903,6 +903,10 @@ static int ip_error(struct sk_buff *skb) bool send; int code; + /* IP on this device is disabled. */ + if (!in_dev) + goto out; + net = dev_net(rt->dst.dev); if (!IN_DEV_FORWARD(in_dev)) { switch (rt->dst.error) { -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in Please read the FAQ at http://www.tux.org/lkml/