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Relax checking of incoming PPTP GRE packets a bit: ignore a bogus payload

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length field when there's no payload indicated by the header 'S' bit.
This works around semi-brokenness in the Mac OS X PPTP client.
This commit is contained in:
Archie Cobbs 2002-09-14 00:00:49 +00:00
parent 2e4dbbaa93
commit cc78c48a68
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=103308
1 changed files with 1 additions and 1 deletions
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2
sys/netgraph/ng_pptpgre.c
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@ -623,7 +623,7 @@ ng_pptpgre_recv(node_p node, item_p item)
/* Sanity check packet length and GRE header bits */
extralen = m->m_pkthdr.len
- (iphlen + grelen + (u_int16_t)ntohs(gre->length));
- (iphlen + grelen + gre->hasSeq * (u_int16_t)ntohs(gre->length));
if (extralen < 0) {
priv->stats.recvBadGRE++;
goto bad;