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From: Gleb Smirnoff <glebius@FreeBSD.org>
Date: Wed, 19 Nov 2014 05:43:32 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-projects@freebsd.org
Subject: svn commit: r274685 - projects/sendfile/sys/netinet
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Author: glebius
Date: Wed Nov 19 05:43:31 2014
New Revision: 274685
URL: https://svnweb.freebsd.org/changeset/base/274685

Log:
  In tcp_usr_send() if the pcb appears to be dropped, avoid freeing
  M_NOTREADY mbufs.
  
  Sponsored by:	Netflix
  Sponsored by:	Nginx, Inc.

Modified:
  projects/sendfile/sys/netinet/tcp_usrreq.c

Modified: projects/sendfile/sys/netinet/tcp_usrreq.c
==============================================================================
--- projects/sendfile/sys/netinet/tcp_usrreq.c	Wed Nov 19 05:38:45 2014	(r274684)
+++ projects/sendfile/sys/netinet/tcp_usrreq.c	Wed Nov 19 05:43:31 2014	(r274685)
@@ -821,7 +821,11 @@ tcp_usr_send(struct socket *so, int flag
 	if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 		if (control)
 			m_freem(control);
-		if (m)
+		/*
+		 * In case of PRUS_NOTREADY, tcp_usr_ready() is responsible
+		 * for freeing memory.
+		 */
+		if (m && (flags & PRUS_NOTREADY) == 0)
 			m_freem(m);
 		error = ECONNRESET;
 		goto out;