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From: Michael Tuexen <tuexen@FreeBSD.org>
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Subject: svn commit: r360758 - stable/11/sys/netinet
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Author: tuexen
Date: Thu May  7 03:01:01 2020
New Revision: 360758
URL: https://svnweb.freebsd.org/changeset/base/360758

Log:
  MFC r356660: Avoid division by zero
  
  Fix division by zero issue.
  
  Thanks to Stas Denisov for reporting the issue for the userland stack
  and providing a fix.

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

Modified: stable/11/sys/netinet/sctp_cc_functions.c
==============================================================================
--- stable/11/sys/netinet/sctp_cc_functions.c	Thu May  7 02:57:33 2020	(r360757)
+++ stable/11/sys/netinet/sctp_cc_functions.c	Thu May  7 03:01:01 2020	(r360758)
@@ -1874,7 +1874,7 @@ htcp_cong_time(struct htcp *ca)
 static inline uint32_t
 htcp_ccount(struct htcp *ca)
 {
-	return (htcp_cong_time(ca) / ca->minRTT);
+	return (ca->minRTT == 0 ? htcp_cong_time(ca) : htcp_cong_time(ca) / ca->minRTT);
 }
 
 static inline void