svn commit: r365595 - stable/12/sys/netinet/tcp_stacks

[Michael Tuexen]

Author: tuexen
Date: Thu Sep 10 17:29:20 2020
New Revision: 365595
URL: https://svnweb.freebsd.org/changeset/base/365595

Log:
  MFC r351328 (by rrs):
  Fix an issue when TSO and Rack play together. Basically
  an retransmission of the initial SYN (with data) would
  cause us to strip the SYN and decrement/increase offset/len
  which then caused us a -1 offset and a panic.

Modified:
  stable/12/sys/netinet/tcp_stacks/rack.c
Directory Properties:
  stable/12/   (props changed)

Modified: stable/12/sys/netinet/tcp_stacks/rack.c
==============================================================================
--- stable/12/sys/netinet/tcp_stacks/rack.c	Thu Sep 10 17:26:16 2020	(r365594)
+++ stable/12/sys/netinet/tcp_stacks/rack.c	Thu Sep 10 17:29:20 2020	(r365595)
@@ -7467,9 +7467,6 @@ again:
 		    (tp->t_state == TCPS_SYN_RECEIVED))
 			flags &= ~TH_SYN;
 #endif
-		sb_offset--, len++;
-		if (sbavail(sb) == 0)
-			len = 0;
 	}
 	/*
 	 * Be careful not to send data and/or FIN on SYN segments. This