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-rw-r--r--src/test/net_tests.cpp38
1 files changed, 38 insertions, 0 deletions
diff --git a/src/test/net_tests.cpp b/src/test/net_tests.cpp
index 213afed730..c1ee231d8a 100644
--- a/src/test/net_tests.cpp
+++ b/src/test/net_tests.cpp
@@ -189,4 +189,42 @@ BOOST_AUTO_TEST_CASE(cnode_simple_test)
BOOST_CHECK(pnode2->fFeeler == false);
}
+// prior to PR #14728, this test triggers an undefined behavior
+BOOST_AUTO_TEST_CASE(ipv4_peer_with_ipv6_addrMe_test)
+{
+ // set up local addresses; all that's necessary to reproduce the bug is
+ // that a normal IPv4 address is among the entries, but if this address is
+ // !IsRoutable the undefined behavior is easier to trigger deterministically
+ {
+ LOCK(cs_mapLocalHost);
+ in_addr ipv4AddrLocal;
+ ipv4AddrLocal.s_addr = 0x0100007f;
+ CNetAddr addr = CNetAddr(ipv4AddrLocal);
+ LocalServiceInfo lsi;
+ lsi.nScore = 23;
+ lsi.nPort = 42;
+ mapLocalHost[addr] = lsi;
+ }
+
+ // create a peer with an IPv4 address
+ in_addr ipv4AddrPeer;
+ ipv4AddrPeer.s_addr = 0xa0b0c001;
+ CAddress addr = CAddress(CService(ipv4AddrPeer, 7777), NODE_NETWORK);
+ std::unique_ptr<CNode> pnode = MakeUnique<CNode>(0, NODE_NETWORK, 0, INVALID_SOCKET, addr, 0, 0, CAddress{}, std::string{}, false);
+ pnode->fSuccessfullyConnected.store(true);
+
+ // the peer claims to be reaching us via IPv6
+ in6_addr ipv6AddrLocal;
+ memset(ipv6AddrLocal.s6_addr, 0, 16);
+ ipv6AddrLocal.s6_addr[0] = 0xcc;
+ CAddress addrLocal = CAddress(CService(ipv6AddrLocal, 7777), NODE_NETWORK);
+ pnode->SetAddrLocal(addrLocal);
+
+ // before patch, this causes undefined behavior detectable with clang's -fsanitize=memory
+ AdvertiseLocal(&*pnode);
+
+ // suppress no-checks-run warning; if this test fails, it's by triggering a sanitizer
+ BOOST_CHECK(1);
+}
+
BOOST_AUTO_TEST_SUITE_END()