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MFC r282594:

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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.
This commit is contained in:
Andrey V. Elsukov 2015-05-21 08:28:35 +00:00
parent be572085e6
commit 0991b150c8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/stable/10/; revision=283198
1 changed files with 1 additions and 0 deletions
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sys/kern/uipc_mbuf.c
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@ -934,6 +934,7 @@ m_dup(struct mbuf *m, int how)
} }
if ((n->m_flags & M_EXT) == 0) if ((n->m_flags & M_EXT) == 0)
nsize = MHLEN; nsize = MHLEN;
n->m_flags &= ~M_RDONLY;
} }
n->m_len = 0; n->m_len = 0;