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From 49fbfce352a678b538113598cba05c48281174a4 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= <philmd@redhat.com>
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Date: Wed, 24 Jul 2019 15:53:34 +0100
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Subject: [PATCH 09/14] slirp: check sscanf result when emulating ident
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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: Philippe Mathieu-Daudé <philmd@redhat.com>
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Message-id: <20190724155337.25303-2-philmd@redhat.com>
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Patchwork-id: 89675
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O-Subject: [RHEL-8.1.0 qemu-kvm PATCH v2 1/4] slirp: check sscanf result when emulating ident
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Bugzilla: 1727642
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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From: William Bowling <will@wbowling.info>
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When emulating ident in tcp_emu, if the strchr checks passed but the
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sscanf check failed, two uninitialized variables would be copied and
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sent in the reply, so move this code inside the if(sscanf()) clause.
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Signed-off-by: William Bowling <will@wbowling.info>
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Cc: qemu-stable@nongnu.org
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Cc: secalert@redhat.com
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Message-Id: <1551476756-25749-1-git-send-email-will@wbowling.info>
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Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
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Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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(cherry picked from commit d3222975c7d6cda9e25809dea05241188457b113)
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Fixes: CVE-2019-9824
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Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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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 | 10 +++++-----
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1 file changed, 5 insertions(+), 5 deletions(-)
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diff --git a/slirp/tcp_subr.c b/slirp/tcp_subr.c
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index 1c7eb28..af1b3eb 100644
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--- a/slirp/tcp_subr.c
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+++ b/slirp/tcp_subr.c
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@@ -665,12 +665,12 @@ tcp_emu(struct socket *so, struct mbuf *m)
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break;
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}
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}
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+ so_rcv->sb_cc = snprintf(so_rcv->sb_data,
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+ so_rcv->sb_datalen,
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+ "%d,%d\r\n", n1, n2);
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+ so_rcv->sb_rptr = so_rcv->sb_data;
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+ so_rcv->sb_wptr = so_rcv->sb_data + so_rcv->sb_cc;
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}
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- so_rcv->sb_cc = snprintf(so_rcv->sb_data,
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- so_rcv->sb_datalen,
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- "%d,%d\r\n", n1, n2);
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- so_rcv->sb_rptr = so_rcv->sb_data;
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- so_rcv->sb_wptr = so_rcv->sb_data + so_rcv->sb_cc;
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}
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m_free(m);
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return 0;
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--
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1.8.3.1
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