From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:34934 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730130AbeGTNO4 (ORCPT ); Fri, 20 Jul 2018 09:14:56 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Eric Dumazet , syzbot , Gerrit Renker , dccp@vger.kernel.org, "David S. Miller" Subject: [PATCH 4.4 13/31] net: dccp: avoid crash in ccid3_hc_rx_send_feedback() Date: Fri, 20 Jul 2018 14:13:43 +0200 Message-Id: <20180720121340.633256628@linuxfoundation.org> In-Reply-To: <20180720121340.158484922@linuxfoundation.org> References: <20180720121340.158484922@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org List-ID: 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Dumazet [ Upstream commit 74174fe5634ffbf645a7ca5a261571f700b2f332 ] On fast hosts or malicious bots, we trigger a DCCP_BUG() which seems excessive. syzbot reported : BUG: delta (-6195) <= 0 at net/dccp/ccids/ccid3.c:628/ccid3_hc_rx_send_feedback() CPU: 1 PID: 18 Comm: ksoftirqd/1 Not tainted 4.18.0-rc1+ #112 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 ccid3_hc_rx_send_feedback net/dccp/ccids/ccid3.c:628 [inline] ccid3_hc_rx_packet_recv.cold.16+0x38/0x71 net/dccp/ccids/ccid3.c:793 ccid_hc_rx_packet_recv net/dccp/ccid.h:185 [inline] dccp_deliver_input_to_ccids+0xf0/0x280 net/dccp/input.c:180 dccp_rcv_established+0x87/0xb0 net/dccp/input.c:378 dccp_v4_do_rcv+0x153/0x180 net/dccp/ipv4.c:654 sk_backlog_rcv include/net/sock.h:914 [inline] __sk_receive_skb+0x3ba/0xd80 net/core/sock.c:517 dccp_v4_rcv+0x10f9/0x1f58 net/dccp/ipv4.c:875 ip_local_deliver_finish+0x2eb/0xda0 net/ipv4/ip_input.c:215 NF_HOOK include/linux/netfilter.h:287 [inline] ip_local_deliver+0x1e9/0x750 net/ipv4/ip_input.c:256 dst_input include/net/dst.h:450 [inline] ip_rcv_finish+0x823/0x2220 net/ipv4/ip_input.c:396 NF_HOOK include/linux/netfilter.h:287 [inline] ip_rcv+0xa18/0x1284 net/ipv4/ip_input.c:492 __netif_receive_skb_core+0x2488/0x3680 net/core/dev.c:4628 __netif_receive_skb+0x2c/0x1e0 net/core/dev.c:4693 process_backlog+0x219/0x760 net/core/dev.c:5373 napi_poll net/core/dev.c:5771 [inline] net_rx_action+0x7da/0x1980 net/core/dev.c:5837 __do_softirq+0x2e8/0xb17 kernel/softirq.c:284 run_ksoftirqd+0x86/0x100 kernel/softirq.c:645 smpboot_thread_fn+0x417/0x870 kernel/smpboot.c:164 kthread+0x345/0x410 kernel/kthread.c:240 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Signed-off-by: Eric Dumazet Reported-by: syzbot Cc: Gerrit Renker Cc: dccp@vger.kernel.org Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/dccp/ccids/ccid3.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) --- a/net/dccp/ccids/ccid3.c +++ b/net/dccp/ccids/ccid3.c @@ -624,9 +624,8 @@ static void ccid3_hc_rx_send_feedback(st case CCID3_FBACK_PERIODIC: delta = ktime_us_delta(now, hc->rx_tstamp_last_feedback); if (delta <= 0) - DCCP_BUG("delta (%ld) <= 0", (long)delta); - else - hc->rx_x_recv = scaled_div32(hc->rx_bytes_recv, delta); + delta = 1; + hc->rx_x_recv = scaled_div32(hc->rx_bytes_recv, delta); break; default: return;