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From: "Andrey V. Elsukov" <ae@FreeBSD.org>
Date: Thu, 7 May 2015 18:35:02 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r282594 - head/sys/kern
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Author: ae
Date: Thu May  7 18:35:01 2015
New Revision: 282594
URL: https://svnweb.freebsd.org/changeset/base/282594

Log:
  m_dup() is supposed to give a writable copy of an mbuf chain. It uses
  m_dup_pkthdr(), that uses M_COPYFLAGS mask to copy m_flags field.
  If original mbuf chain has M_RDONLY flag, its copy also will have it.
  Reset this flag explicitly.
  
  MFC after:	2 weeks

Modified:
  head/sys/kern/uipc_mbuf.c

Modified: head/sys/kern/uipc_mbuf.c
==============================================================================
--- head/sys/kern/uipc_mbuf.c	Thu May  7 18:32:11 2015	(r282593)
+++ head/sys/kern/uipc_mbuf.c	Thu May  7 18:35:01 2015	(r282594)
@@ -813,6 +813,7 @@ m_dup(struct mbuf *m, int how)
 			}
 			if ((n->m_flags & M_EXT) == 0)
 				nsize = MHLEN;
+			n->m_flags &= ~M_RDONLY;
 		}
 		n->m_len = 0;