svn commit: r360742 - stable/11/sys/netinet

[Michael Tuexen]

Author: tuexen
Date: Thu May  7 02:06:37 2020
New Revision: 360742
URL: https://svnweb.freebsd.org/changeset/base/360742

Log:
  MFC r353119: Fix padding of COOKIE_ECHO chunks
  
  Fix the adding of padding to COOKIE-ECHO chunks.
  
  Thanks to Mark Wodrich who found this issue while fuzz testing the
  usrsctp stack and reported the issue in
  https://github.com/sctplab/usrsctp/issues/382

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	Thu May  7 02:03:25 2020	(r360741)
+++ stable/11/sys/netinet/sctp_output.c	Thu May  7 02:06:37 2020	(r360742)
@@ -9053,8 +9053,7 @@ sctp_send_cookie_echo(struct mbuf *m,
 				pad = 4 - pad;
 			}
 			if (pad > 0) {
-				cookie = sctp_pad_lastmbuf(cookie, pad, NULL);
-				if (cookie == NULL) {
+				if (sctp_pad_lastmbuf(cookie, pad, NULL) == NULL) {
 					return (-8);
 				}
 			}