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From 2e1dcbc0c2af64fcb17009eaf2ceedd81be2b27f Mon Sep 17 00:00:00 2001
From: Prasad J Pandit <pjp@fedoraproject.org>
Date: Thu, 26 Nov 2020 19:27:06 +0530
Subject: [PATCH] slirp: check pkt_len before reading protocol header
MIME-Version: 1.0
Content-Type: text/plain; charset=utf8
Content-Transfer-Encoding: 8bit

While processing ARP/NCSI packets in 'arp_input' or 'ncsi_input'
routines, ensure that pkt_len is large enough to accommodate the
respective protocol headers, lest it should do an OOB access.
Add check to avoid it.

CVE-2020-29129 CVE-2020-29130
  QEMU: slirp: out-of-bounds access while processing ARP/NCSI packets
 -> https://www.openwall.com/lists/oss-security/2020/11/27/1

Reported-by: Qiuhao Li <Qiuhao.Li@outlook.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Message-Id: <20201126135706.273950-1-ppandit@redhat.com>
Reviewed-by: Marc-Andrà Lureau <marcandre.lureau@redhat.com>

Upstream-Status: Backport
CVE: CVE-2020-29129 CVE-2020-29130
[https://git.qemu.org/?p=libslirp.git;a=commit;h=2e1dcbc0c2af64fcb17009eaf2ceedd81be2b27f]
Signed-off-by: Li Wang <li.wang@windriver.com>
---
 slirp/src/ncsi.c  | 4 ++++
 slirp/src/slirp.c | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/slirp/src/ncsi.c b/slirp/src/ncsi.c
index 3c1dfef..75dcc08 100644
--- a/slirp/src/ncsi.c
+++ b/slirp/src/ncsi.c
@@ -148,6 +148,10 @@ void ncsi_input(Slirp *slirp, const uint8_t *pkt, int pkt_len)
     uint32_t checksum;
     uint32_t *pchecksum;
 
+    if (pkt_len < ETH_HLEN + sizeof(struct ncsi_pkt_hdr)) {
+        return; /* packet too short */
+    }
+
     memset(ncsi_reply, 0, sizeof(ncsi_reply));
 
     memset(reh->h_dest, 0xff, ETH_ALEN);
diff --git a/slirp/src/slirp.c b/slirp/src/slirp.c
index dba7c98..9be58e2 100644
--- a/slirp/src/slirp.c
+++ b/slirp/src/slirp.c
@@ -756,6 +756,10 @@ static void arp_input(Slirp *slirp, const uint8_t *pkt, int pkt_len)
         return;
     }
 
+    if (pkt_len < ETH_HLEN + sizeof(struct slirp_arphdr)) {
+        return; /* packet too short */
+    }
+
     ar_op = ntohs(ah->ar_op);
     switch (ar_op) {
     case ARPOP_REQUEST:
-- 
2.17.1