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author | archie <archie@FreeBSD.org> | 2002-06-05 23:29:29 +0000 |
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committer | archie <archie@FreeBSD.org> | 2002-06-05 23:29:29 +0000 |
commit | 40b64d10d776065e68625944c67fdaa006c8cfa9 (patch) | |
tree | f9a238e01e472bfde0491aeb7402d9bab587e2cc /sys/netgraph/ng_cisco.c | |
parent | 2971698c460fdf99fe11db08cb7a88a0aff6d8f1 (diff) | |
download | FreeBSD-src-40b64d10d776065e68625944c67fdaa006c8cfa9.zip FreeBSD-src-40b64d10d776065e68625944c67fdaa006c8cfa9.tar.gz |
Fix bugs where mbuf data was being accessed without m_pullup().
Reviewed by: julian, brian
MFC after: 1 week
Diffstat (limited to 'sys/netgraph/ng_cisco.c')
-rw-r--r-- | sys/netgraph/ng_cisco.c | 50 |
1 files changed, 43 insertions, 7 deletions
diff --git a/sys/netgraph/ng_cisco.c b/sys/netgraph/ng_cisco.c index 583f7ac..13d5dd3 100644 --- a/sys/netgraph/ng_cisco.c +++ b/sys/netgraph/ng_cisco.c @@ -443,20 +443,31 @@ cisco_disconnect(hook_p hook) static int cisco_input(sc_p sc, item_p item) { - struct cisco_header *h; - struct cisco_packet *p; + const struct cisco_header *h; + struct cisco_header hdrbuf; struct protoent *pep; int error = 0; struct mbuf *m; + /* Get data */ m = NGI_M(item); - if (m->m_pkthdr.len <= CISCO_HEADER_LEN) + + /* Sanity check header length */ + if (m->m_pkthdr.len < sizeof(*h)) { + error = EINVAL; goto drop; + } - /* Strip off cisco header */ - h = mtod(m, struct cisco_header *); - m_adj(m, CISCO_HEADER_LEN); + /* Get cisco header */ + if (m->m_len >= sizeof(*h)) /* the common case */ + h = mtod(m, const struct cisco_header *); + else { + m_copydata(m, 0, sizeof(*h), (caddr_t)&hdrbuf); + h = &hdrbuf; + } + m_adj(m, sizeof(*h)); + /* Check header address */ switch (h->address) { default: /* Invalid Cisco packet. */ goto drop; @@ -467,7 +478,25 @@ cisco_input(sc_p sc, item_p item) default: goto drop; case CISCO_KEEPALIVE: - p = mtod(m, struct cisco_packet *); + { + const struct cisco_packet *p; + struct cisco_packet pktbuf; + + /* Sanity check packet length */ + if (m->m_pkthdr.len < sizeof(*p)) { + error = EINVAL; + goto drop; + } + + /* Get cisco packet */ + if (m->m_len >= sizeof(*p)) /* the common case */ + p = mtod(m, const struct cisco_packet *); + else { + m_copydata(m, 0, sizeof(*p), (caddr_t)&pktbuf); + p = &pktbuf; + } + + /* Check packet type */ switch (ntohl(p->type)) { default: log(LOG_WARNING, @@ -512,6 +541,7 @@ cisco_input(sc_p sc, item_p item) } } goto drop; + } case ETHERTYPE_IP: pep = &sc->inet; break; @@ -528,6 +558,12 @@ cisco_input(sc_p sc, item_p item) break; } + /* Drop if payload is empty */ + if (m->m_pkthdr.len == 0) { + error = EINVAL; + goto drop; + } + /* Send it on */ if (pep->hook == NULL) goto drop; |