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Check the size of data available in mbuf, before using them.

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PR:		202667
MFC after:	1 week
This commit is contained in:
Andrey V. Elsukov 2015-10-28 17:55:37 +00:00
parent e6b0222d60
commit 50bc87bc43
1 changed files with 8 additions and 0 deletions
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8
sys/net/if_gre.c
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@ -691,6 +691,14 @@ gre_input(struct mbuf **mp, int *offp, int proto)
KASSERT(sc != NULL, ("encap_getarg returned NULL"));
ifp = GRE2IFP(sc);
hlen = *offp + sizeof(struct grehdr) + 4 * sizeof(uint32_t);
if (m->m_pkthdr.len < hlen)
goto drop;
if (m->m_len < hlen) {
m = m_pullup(m, hlen);
if (m == NULL)
goto drop;
}
gh = (struct grehdr *)mtodo(m, *offp);
flags = ntohs(gh->gre_flags);
if (flags & ~GRE_FLAGS_MASK)