slirp: check data length while emulating ident function
While emulating identification protocol, tcp_emu() does not check
available space in the 'sc_rcv->sb_data' buffer. It could lead to
heap buffer overflow issue. Add check to avoid it.
Reported-by: Kira <864786842@qq.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
(cherry picked from commit a7104eda7d
)
*CVE-2019-6778
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
stable-3.0
parent
bd6dd4eaa6
commit
345fab6ffe
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@ -640,6 +640,11 @@ tcp_emu(struct socket *so, struct mbuf *m)
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socklen_t addrlen = sizeof(struct sockaddr_in);
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struct sbuf *so_rcv = &so->so_rcv;
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if (m->m_len > so_rcv->sb_datalen
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- (so_rcv->sb_wptr - so_rcv->sb_data)) {
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return 1;
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}
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memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
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so_rcv->sb_wptr += m->m_len;
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so_rcv->sb_rptr += m->m_len;
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