rip: Add missing minimum length validation in rip_output()
If the socket is configured such that the sender is expected to supply the IP header, then we need to verify that it actually did so. Reported by: syzkaller+KMSAN Reviewed by: donner MFC after: 1 week Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D31302
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@ -523,8 +523,15 @@ rip_output(struct mbuf *m, struct socket *so, ...)
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} else {
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if (m->m_pkthdr.len > IP_MAXPACKET) {
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m_freem(m);
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return(EMSGSIZE);
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return (EMSGSIZE);
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}
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if (m->m_pkthdr.len < sizeof(*ip)) {
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m_freem(m);
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return (EINVAL);
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}
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m = m_pullup(m, sizeof(*ip));
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if (m == NULL)
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return (ENOMEM);
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ip = mtod(m, struct ip *);
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hlen = ip->ip_hl << 2;
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if (m->m_len < hlen) {
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