openvswitch: backport patch to fix CVE-2022-4337 and CVE-2022-4338

CVE-2022-4337: openvswitch: Out-of-Bounds Read in Organization Specific TLV
CVE-2022-4338: openvswitch: Integer Underflow in Organization Specific TLV

Reference:
https://github.com/openvswitch/ovs/pull/405
7490f281f0

Signed-off-by: Xiangyu Chen <xiangyu.chen@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

recipes-networking/openvswitch/files/0001-lldp-Fix-bugs-when-parsing-malformed-AutoAttach.patch

@@ -0,0 +1,86 @@
+From 7490f281f09a8455c48e19b0cf1b99ab758ee4f4 Mon Sep 17 00:00:00 2001
+From: Qian Chen <cq674350529@163.com>
+Date: Tue, 20 Dec 2022 09:36:08 -0500
+Subject: [PATCH] lldp: Fix bugs when parsing malformed AutoAttach.
+
+The OVS LLDP implementation includes support for AutoAttach standard, which
+the 'upstream' lldpd project does not include.  As part of adding this
+support, the message parsing for these TLVs did not include proper length
+checks for the LLDP_TLV_AA_ELEMENT_SUBTYPE and the
+LLDP_TLV_AA_ISID_VLAN_ASGNS_SUBTYPE elements.  The result is that a message
+without a proper boundary will cause an overread of memory, and lead to
+undefined results, including crashes or other unidentified behavior.
+
+The fix is to introduce proper bounds checking for these elements.  Introduce
+a unit test to ensure that we have some proper rejection in this code
+base in the future.
+
+Fixes: be53a5c447c3 ("auto-attach: Initial support for Auto-Attach standard")
+
+Upstream-Status: Backport from upstream [https://github.com/openvswitch/ovs/commit/7490f281f09a8455c48e19b0cf1b99ab758ee4f4]
+CVE: CVE-2022-4337 - openvswitch: Out-of-Bounds Read in Organization Specific TLV
+CVE: CVE-2022-4338 - openvswitch: Integer Underflow in Organization Specific TLV
+
+Signed-off-by: Qian Chen <cq674350529@163.com>
+Co-authored-by: Aaron Conole <aconole@redhat.com>
+Signed-off-by: Aaron Conole <aconole@redhat.com>
+Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
+Signed-off-by: Xiangyu Chen <xiangyu.chen@windriver.com>
+---
+ lib/lldp/lldp.c       |  2 ++
+ tests/ofproto-dpif.at | 19 +++++++++++++++++++
+ 2 files changed, 21 insertions(+)
+
+diff --git a/lib/lldp/lldp.c b/lib/lldp/lldp.c
+index dfeb2a800..6fdcfef56 100644
+--- a/lib/lldp/lldp.c
++++ b/lib/lldp/lldp.c
+@@ -583,6 +583,7 @@ lldp_decode(struct lldpd *cfg OVS_UNUSED, char *frame, int s,
+ 
+                 switch(tlv_subtype) {
+                 case LLDP_TLV_AA_ELEMENT_SUBTYPE:
++                    CHECK_TLV_SIZE(50, "ELEMENT");
+                     PEEK_BYTES(&msg_auth_digest, sizeof msg_auth_digest);
+ 
+                     aa_element_dword = PEEK_UINT32;
+@@ -629,6 +630,7 @@ lldp_decode(struct lldpd *cfg OVS_UNUSED, char *frame, int s,
+                     break;
+ 
+                 case LLDP_TLV_AA_ISID_VLAN_ASGNS_SUBTYPE:
++                    CHECK_TLV_SIZE(36, "ISID_VLAN_ASGNS");
+                     PEEK_BYTES(&msg_auth_digest, sizeof msg_auth_digest);
+ 
+                     /* Subtract off tlv type and length (2Bytes) + OUI (3B) +
+diff --git a/tests/ofproto-dpif.at b/tests/ofproto-dpif.at
+index eb4cd1896..fa6111c1e 100644
+--- a/tests/ofproto-dpif.at
++++ b/tests/ofproto-dpif.at
+@@ -62,6 +62,25 @@ AT_CHECK([ovs-appctl coverage/read-counter rev_reconfigure], [0], [dnl
+ OVS_VSWITCHD_STOP
+ AT_CLEANUP
+ 
++AT_SETUP([ofproto-dpif - malformed lldp autoattach tlv])
++OVS_VSWITCHD_START()
++add_of_ports br0 1
++
++dnl Enable lldp
++AT_CHECK([ovs-vsctl set interface p1 lldp:enable=true])
++
++dnl Send a malformed lldp packet
++packet="0180c200000ef6b426aa5f0088cc020704f6b426aa5f000403057632060200780c"dnl
++"5044454144424545464445414442454546444541444245454644454144424545464445414"dnl
++"4424545464445414442454546444541444245454644454144424545464445414442454546"dnl
++"4445414442454546fe0500040d0c010000"
++AT_CHECK([ovs-appctl netdev-dummy/receive p1 "$packet"], [0], [stdout])
++
++OVS_WAIT_UNTIL([grep -q "ISID_VLAN_ASGNS TLV too short" ovs-vswitchd.log])
++
++OVS_VSWITCHD_STOP(["/|WARN|ISID_VLAN_ASGNS TLV too short received on/d"])
++AT_CLEANUP
++
+ AT_SETUP([ofproto-dpif - active-backup bonding (with primary)])
+ 
+ dnl Create br0 with members p1, p2 and p7, creating bond0 with p1 and
+-- 
+2.34.1
+

recipes-networking/openvswitch/openvswitch_git.bb

@@ -27,6 +27,7 @@ SRC_URI += "git://github.com/openvswitch/ovs.git;protocol=https;branch=branch-2.
             file://kernel_module.patch \
             file://systemd-update-tool-paths.patch \
             file://systemd-create-runtime-dirs.patch \
+            file://0001-lldp-Fix-bugs-when-parsing-malformed-AutoAttach.patch \
            "
 
 LIC_FILES_CHKSUM = "file://LICENSE;md5=1ce5d23a6429dff345518758f13aaeab"