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From: Randall Stewart <rrs@FreeBSD.org>
Date: Tue, 26 Oct 2010 18:56:56 +0000 (UTC)
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Subject: svn commit: r214388 - stable/8/sys/netinet
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Author: rrs
Date: Tue Oct 26 18:56:55 2010
New Revision: 214388
URL: http://svn.freebsd.org/changeset/base/214388

Log:
  MFC of 209644
  Log is:
  Fix a bug that will cause a panic. Basically
  a read-lock is being called to check the vtag-timewait cache.
  Then in two cases (where a vtag is bad i.e. in the time-wait
  state) the write-unlokc is called NOT the read-unlock. Under
  conditions where lots of associations are coming and going
  this willc ause the system to panic with invariants on.

Modified:
  stable/8/sys/netinet/sctp_pcb.c
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)
  stable/8/sys/dev/xen/xenpci/   (props changed)

Modified: stable/8/sys/netinet/sctp_pcb.c
==============================================================================
--- stable/8/sys/netinet/sctp_pcb.c	Tue Oct 26 18:32:51 2010	(r214387)
+++ stable/8/sys/netinet/sctp_pcb.c	Tue Oct 26 18:56:55 2010	(r214388)
@@ -6499,7 +6499,7 @@ sctp_is_vtag_good(struct sctp_inpcb *inp
 				continue;
 			}
 			/* Its a used tag set */
-			SCTP_INP_INFO_WUNLOCK();
+			SCTP_INP_INFO_RUNLOCK();
 			return (0);
 		}
 	}
@@ -6528,7 +6528,7 @@ skip_vtag_check:
 					    (twait_block->vtag_block[i].lport == lport) &&
 				    (twait_block->vtag_block[i].rport == rport)) {
 					/* Bad tag, sorry :< */
-					SCTP_INP_INFO_WUNLOCK();
+					SCTP_INP_INFO_RUNLOCK();
 					return (0);
 				}
 			}