From owner-svn-src-stable-11@freebsd.org  Wed May  6 22:20:54 2020
Return-Path: <owner-svn-src-stable-11@freebsd.org>
Delivered-To: svn-src-stable-11@mailman.nyi.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1])
 by mailman.nyi.freebsd.org (Postfix) with ESMTP id 6AE452E104B;
 Wed,  6 May 2020 22:20:54 +0000 (UTC)
 (envelope-from tuexen@FreeBSD.org)
Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org
 [IPv6:2610:1c1:1:606c::19:3])
 (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
 server-signature RSA-PSS (4096 bits)
 client-signature RSA-PSS (4096 bits) client-digest SHA256)
 (Client CN "mxrelay.nyi.freebsd.org",
 Issuer "Let's Encrypt Authority X3" (verified OK))
 by mx1.freebsd.org (Postfix) with ESMTPS id 49HWJQ0SHDz4HDW;
 Wed,  6 May 2020 22:20:54 +0000 (UTC)
 (envelope-from tuexen@FreeBSD.org)
Received: from repo.freebsd.org (repo.freebsd.org
 [IPv6:2610:1c1:1:6068::e6a:0])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 0A9BA6891;
 Wed,  6 May 2020 22:20:54 +0000 (UTC)
 (envelope-from tuexen@FreeBSD.org)
Received: from repo.freebsd.org ([127.0.1.37])
 by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 046MKrRJ038355;
 Wed, 6 May 2020 22:20:53 GMT (envelope-from tuexen@FreeBSD.org)
Received: (from tuexen@localhost)
 by repo.freebsd.org (8.15.2/8.15.2/Submit) id 046MKr2w038354;
 Wed, 6 May 2020 22:20:53 GMT (envelope-from tuexen@FreeBSD.org)
Message-Id: <202005062220.046MKr2w038354@repo.freebsd.org>
X-Authentication-Warning: repo.freebsd.org: tuexen set sender to
 tuexen@FreeBSD.org using -f
From: Michael Tuexen <tuexen@FreeBSD.org>
Date: Wed, 6 May 2020 22:20:53 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org
Subject: svn commit: r360714 - stable/11/sys/netinet
X-SVN-Group: stable-11
X-SVN-Commit-Author: tuexen
X-SVN-Commit-Paths: stable/11/sys/netinet
X-SVN-Commit-Revision: 360714
X-SVN-Commit-Repository: base
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
X-BeenThere: svn-src-stable-11@freebsd.org
X-Mailman-Version: 2.1.30
Precedence: list
List-Id: SVN commit messages for only the 11-stable src tree
 <svn-src-stable-11.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/svn-src-stable-11>, 
 <mailto:svn-src-stable-11-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-stable-11/>
List-Post: <mailto:svn-src-stable-11@freebsd.org>
List-Help: <mailto:svn-src-stable-11-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/svn-src-stable-11>, 
 <mailto:svn-src-stable-11-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 06 May 2020 22:20:54 -0000

Author: tuexen
Date: Wed May  6 22:20:53 2020
New Revision: 360714
URL: https://svnweb.freebsd.org/changeset/base/360714

Log:
  MFC r350254: Improve SCTP locking
  
  Don't hold a mutex while calling sbwait. This was found by syzkaller.
  
  Submitted by:		rrs
  Reported by:		markj

Modified:
  stable/11/sys/netinet/sctp_output.c
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/sys/netinet/sctp_output.c
==============================================================================
--- stable/11/sys/netinet/sctp_output.c	Wed May  6 22:20:37 2020	(r360713)
+++ stable/11/sys/netinet/sctp_output.c	Wed May  6 22:20:53 2020	(r360714)
@@ -13399,10 +13399,10 @@ skip_preblock:
 					    stcb,
 					    SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
 				}
-				if (hold_tcblock == 1) {
-					SCTP_TCB_UNLOCK(stcb);
-					hold_tcblock = 0;
-				}
+			}
+			if (hold_tcblock == 1) {
+				SCTP_TCB_UNLOCK(stcb);
+				hold_tcblock = 0;
 			}
 			SOCKBUF_LOCK(&so->so_snd);
 			/*-