svn commit: r343769 - head/sys/netinet

[Michael Tuexen]

Author: tuexen
Date: Tue Feb  5 10:13:51 2019
New Revision: 343769
URL: https://svnweb.freebsd.org/changeset/base/343769

Log:
  Fix an off-by-one error in the input validation of the SCTP_RESET_STREAMS
  socketoption.
  
  This was found by running syzkaller.
  
  MFC after:		3 days

Modified:
  head/sys/netinet/sctp_usrreq.c

Modified: head/sys/netinet/sctp_usrreq.c
==============================================================================
--- head/sys/netinet/sctp_usrreq.c	Tue Feb  5 08:15:19 2019	(r343768)
+++ head/sys/netinet/sctp_usrreq.c	Tue Feb  5 10:13:51 2019	(r343769)
@@ -4654,13 +4654,13 @@ sctp_setopt(struct socket *so, int optname, void *optv
 			}
 			for (i = 0; i < strrst->srs_number_streams; i++) {
 				if ((send_in) &&
-				    (strrst->srs_stream_list[i] > stcb->asoc.streamincnt)) {
+				    (strrst->srs_stream_list[i] >= stcb->asoc.streamincnt)) {
 					SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_USRREQ, EINVAL);
 					error = EINVAL;
 					break;
 				}
 				if ((send_out) &&
-				    (strrst->srs_stream_list[i] > stcb->asoc.streamoutcnt)) {
+				    (strrst->srs_stream_list[i] >= stcb->asoc.streamoutcnt)) {
 					SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_USRREQ, EINVAL);
 					error = EINVAL;
 					break;