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Fix bug in m_split() in a case when split len matches len of the

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first mbuf, and the first mbuf is M_PKTHDR.

PR:		kern/176144
Submitted by:	Jacques Fourie <jacques.fourie gmail.com>
This commit is contained in:
Gleb Smirnoff 2013-03-29 14:10:40 +00:00
parent 844cacd17c
commit 21f398487c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=248887
1 changed files with 10 additions and 1 deletions
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11
sys/kern/uipc_mbuf.c
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@ -1197,7 +1197,16 @@ m_split(struct mbuf *m0, int len0, int wait)
if (m == NULL)
return (NULL);
remain = m->m_len - len;
if (m0->m_flags & M_PKTHDR) {
if (m0->m_flags & M_PKTHDR && remain == 0) {
n = m_gethdr(wait, m0->m_type);
return (NULL);
n->m_next = m->m_next;
m->m_next = NULL;
n->m_pkthdr.rcvif = m0->m_pkthdr.rcvif;
n->m_pkthdr.len = m0->m_pkthdr.len - len0;
m0->m_pkthdr.len = len0;
return (n);
} else if (m0->m_flags & M_PKTHDR) {
n = m_gethdr(wait, m0->m_type);
if (n == NULL)
return (NULL);