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;
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