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From: Rick Macklem <rmacklem@FreeBSD.org>
Date: Wed, 4 Jan 2012 00:24:10 +0000 (UTC)
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Subject: svn commit: r229450 - in stable/8/sys: conf nfsclient
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Author: rmacklem
Date: Wed Jan  4 00:24:09 2012
New Revision: 229450
URL: http://svn.freebsd.org/changeset/base/229450

Log:
  MFC: r227690
  The old NFS client will crash due to the reply being m_freem()'d
  twice if the server bogusly returns an error with the NFSERR_RETERR
  bit (bit 31) set. No actual NFS error has this bit set, but it seems
  that amd will sometimes do this. This patch makes sure the NFSERR_RETERR
  bit is cleared to avoid a crash.

Modified:
  stable/8/sys/nfsclient/nfs_krpc.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/conf/ldscript.mips.octeon1.32   (props changed)
  stable/8/sys/conf/ldscript.mips.octeon1.64   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)

Modified: stable/8/sys/nfsclient/nfs_krpc.c
==============================================================================
--- stable/8/sys/nfsclient/nfs_krpc.c	Wed Jan  4 00:04:01 2012	(r229449)
+++ stable/8/sys/nfsclient/nfs_krpc.c	Wed Jan  4 00:24:09 2012	(r229450)
@@ -540,6 +540,11 @@ tryagain:
 				    hz);
 			goto tryagain;
 		}
+		/*
+		 * Make sure NFSERR_RETERR isn't bogusly set by a server
+		 * such as amd. (No actual NFS error has bit 31 set.)
+		 */
+		error &= ~NFSERR_RETERR;
 
 		/*
 		 * If the File Handle was stale, invalidate the lookup