From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6BCDAC282C8 for ; Mon, 28 Jan 2019 15:45:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2ED3121741 for ; Mon, 28 Jan 2019 15:45:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1548690304; bh=Gu/bul+kriYcN94uMrAWo0kYYB3ZX3NjGr/JJYtEsAw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=OWS/q0NuS/OM2LIyHHVqvWvvnvI64DzvtaSaOtmOx5PytF6vSBs31VJtZdwdz6xq3 cSv0lHX7DxDzXG+3/807UeRBJsTvruIrqUhjXGdbV06EbnJ6RnLNWbfin145lyURjq 72eRDmS2K35hpgI6l3FHds4O6G5td7XUXsl0tFB0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727627AbfA1PpC (ORCPT ); Mon, 28 Jan 2019 10:45:02 -0500 Received: from mail.kernel.org ([198.145.29.99]:58354 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727599AbfA1Po6 (ORCPT ); Mon, 28 Jan 2019 10:44:58 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B271F2177B; Mon, 28 Jan 2019 15:44:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1548690298; bh=Gu/bul+kriYcN94uMrAWo0kYYB3ZX3NjGr/JJYtEsAw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=u8MhH5q7wohx6qHr1yNyCCR1mDmusuNBg9ouhT6nTSPyO4Rs6hhvVsMUNlPJCeICc 2qBHbLPGHidyGQBialAfMI/8glYtJwrHLbjImyKYfaYYtv4LASovCFrBHeOrHX+FXF B3EqxIHwT+2ge4/y1i7bpjViap0+nkOHYZ0XgThE= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: "David S. Miller" , Sasha Levin , linux-sctp@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.20 039/304] sctp: Fix SKB list traversal in sctp_intl_store_ordered(). Date: Mon, 28 Jan 2019 10:39:16 -0500 Message-Id: <20190128154341.47195-39-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190128154341.47195-1-sashal@kernel.org> References: <20190128154341.47195-1-sashal@kernel.org> MIME-Version: 1.0 X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "David S. Miller" [ Upstream commit e15e067d0656625c77c52b4e5f0cfbf0c0c3583f ] Same change as made to sctp_intl_store_reasm(). To be fully correct, an iterator has an undefined value when something like skb_queue_walk() naturally terminates. This will actually matter when SKB queues are converted over to list_head. Formalize what this code ends up doing with the current implementation. Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- net/sctp/stream_interleave.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/net/sctp/stream_interleave.c b/net/sctp/stream_interleave.c index 0a78cdf86463..500449b72eca 100644 --- a/net/sctp/stream_interleave.c +++ b/net/sctp/stream_interleave.c @@ -383,7 +383,7 @@ static void sctp_intl_store_ordered(struct sctp_ulpq *ulpq, struct sctp_ulpevent *event) { struct sctp_ulpevent *cevent; - struct sk_buff *pos; + struct sk_buff *pos, *loc; pos = skb_peek_tail(&ulpq->lobby); if (!pos) { @@ -403,18 +403,25 @@ static void sctp_intl_store_ordered(struct sctp_ulpq *ulpq, return; } + loc = NULL; skb_queue_walk(&ulpq->lobby, pos) { cevent = (struct sctp_ulpevent *)pos->cb; - if (cevent->stream > event->stream) + if (cevent->stream > event->stream) { + loc = pos; break; - + } if (cevent->stream == event->stream && - MID_lt(event->mid, cevent->mid)) + MID_lt(event->mid, cevent->mid)) { + loc = pos; break; + } } - __skb_queue_before(&ulpq->lobby, pos, sctp_event2skb(event)); + if (!loc) + __skb_queue_tail(&ulpq->lobby, sctp_event2skb(event)); + else + __skb_queue_before(&ulpq->lobby, loc, sctp_event2skb(event)); } static void sctp_intl_retrieve_ordered(struct sctp_ulpq *ulpq, -- 2.19.1