Add size check on meta.key_origin.path

Resolves segfault on legacy wallet

Log warning when meta.key_origin.path is below expected size

Author: rooprob

src/wallet/scriptpubkeyman.cpp

@@ -382,11 +382,18 @@ std::vector<WalletDestination> LegacyScriptPubKeyMan::MarkUnusedAddresses(const
         if (it != mapKeyMetadata.end()){
             CKeyMetadata meta = it->second;
             if (!meta.hd_seed_id.IsNull() && meta.hd_seed_id != m_hd_chain.seed_id) {
-                bool internal = (meta.key_origin.path[1] & ~BIP32_HARDENED_KEY_LIMIT) != 0;
-                int64_t index = meta.key_origin.path[2] & ~BIP32_HARDENED_KEY_LIMIT;
-
-                if (!TopUpInactiveHDChain(meta.hd_seed_id, index, internal)) {
-                    WalletLogPrintf("%s: Adding inactive seed keys failed\n", __func__);
+                if (meta.key_origin.path.size() < 3) {
+                    WalletLogPrintf("%s: Adding inactive seed keys failed, insufficient path size: %d, has_key_origin: %s\n",
+                                    __func__,
+                                    meta.key_origin.path.size(),
+                                    meta.has_key_origin);
+                } else {
+                    bool internal = (meta.key_origin.path[1] & ~BIP32_HARDENED_KEY_LIMIT) != 0;
+                    int64_t index = meta.key_origin.path[2] & ~BIP32_HARDENED_KEY_LIMIT;
+
+                    if (!TopUpInactiveHDChain(meta.hd_seed_id, index, internal)) {
+                        WalletLogPrintf("%s: Adding inactive seed keys failed\n", __func__);
+                    }
                 }
             }
         }