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From c894cd80e9b6c7c317da2dbeacf52a34dc5efdbb Mon Sep 17 00:00:00 2001
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From: Xiao Wang <jasowang@redhat.com>
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Date: Fri, 22 Feb 2019 08:32:02 +0000
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Subject: [PATCH] slirp: check data length while emulating ident function
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Xiao Wang <jasowang@redhat.com>
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Message-id: <20190222083202.20283-1-jasowang@redhat.com>
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Patchwork-id: 84699
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O-Subject: [RHEL8/rhel qemu-kvm PATCH] slirp: check data length while emulating ident function
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Bugzilla: 1669069
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RH-Acked-by: Jens Freimann <jfreimann@redhat.com>
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RH-Acked-by: Maxime Coquelin <maxime.coquelin@redhat.com>
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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From: Prasad J Pandit <pjp@fedoraproject.org>
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1669069
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Brew Build: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=20325086
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Test status: Tested by myself
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Branch: rhel8/master-2.12.0
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While emulating identification protocol, tcp_emu() does not check
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available space in the 'sc_rcv->sb_data' buffer. It could lead to
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heap buffer overflow issue. Add check to avoid it.
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Reported-by: Kira <864786842@qq.com>
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Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
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Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
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(cherry picked from commit a7104eda7dab99d0cdbd3595c211864cba415905)
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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slirp/tcp_subr.c | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/slirp/tcp_subr.c b/slirp/tcp_subr.c
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index da0d537..1c7eb28 100644
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--- a/slirp/tcp_subr.c
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+++ b/slirp/tcp_subr.c
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@@ -638,6 +638,11 @@ 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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+
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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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--
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1.8.3.1
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