descriptors: Reject + sign in ParseKeyPathNum

Author: MarcoFalke

src/script/descriptor.cpp

@@ -1423,16 +1423,16 @@ std::optional<uint32_t> ParseKeyPathNum(std::span<const char> elem, bool& apostr
             apostrophe = last == '\'';
         }
     }
-    uint32_t p;
-    if (!ParseUInt32(std::string(elem.begin(), elem.end()), &p)) {
-        error = strprintf("Key path value '%s' is not a valid uint32", std::string(elem.begin(), elem.end()));
+    const auto p{ToIntegral<uint32_t>(std::string_view{elem.begin(), elem.end()})};
+    if (!p) {
+        error = strprintf("Key path value '%s' is not a valid uint32", std::string_view{elem.begin(), elem.end()});
         return std::nullopt;
-    } else if (p > 0x7FFFFFFFUL) {
-        error = strprintf("Key path value %u is out of range", p);
+    } else if (*p > 0x7FFFFFFFUL) {
+        error = strprintf("Key path value %u is out of range", *p);
         return std::nullopt;
     }
 
-    return std::make_optional<uint32_t>(p | (((uint32_t)hardened) << 31));
+    return std::make_optional<uint32_t>(*p | (((uint32_t)hardened) << 31));
 }
 
 /**

src/test/descriptor_tests.cpp

@@ -567,6 +567,7 @@ BOOST_AUTO_TEST_CASE(descriptor_test)
     CheckUnparsable("combo([012345678]xprvA1RpRA33e1JQ7ifknakTFpgNXPmW2YvmhqLQYMmrj4xJXXWYpDPS3xz7iAxn8L39njGVyuoseXzU6rcxFLJ8HFsTjSyQbLYnMpCqE2VbFWc)", "combo([012345678]xpub6ERApfZwUNrhLCkDtcHTcxd75RbzS1ed54G1LkBUHQVHQKqhMkhgbmJbZRkrgZw4koxb5JaHWkY4ALHY2grBGRjaDMzQLcgJvLJuZZvRcEL)", "combo(): Fingerprint is not 4 bytes (9 characters instead of 8 characters)"); // Too long key fingerprint
     CheckUnparsable("pkh(xprv9s21ZrQH143K31xYSDQpPDxsXRTUcvj2iNHm5NUtrGiGG5e2DtALGdso3pGz6ssrdK4PFmM8NSpSBHNqPqm55Qn3LqFtT2emdEXVYsCzC2U/2147483648)", "pkh(xpub661MyMwAqRbcFW31YEwpkMuc5THy2PSt5bDMsktWQcFF8syAmRUapSCGu8ED9W6oDMSgv6Zz8idoc4a6mr8BDzTJY47LJhkJ8UB7WEGuduB/2147483648)", "pkh(): Key path value 2147483648 is out of range"); // BIP 32 path element overflow
     CheckUnparsable("pkh(xprv9s21ZrQH143K31xYSDQpPDxsXRTUcvj2iNHm5NUtrGiGG5e2DtALGdso3pGz6ssrdK4PFmM8NSpSBHNqPqm55Qn3LqFtT2emdEXVYsCzC2U/1aa)", "pkh(xpub661MyMwAqRbcFW31YEwpkMuc5THy2PSt5bDMsktWQcFF8syAmRUapSCGu8ED9W6oDMSgv6Zz8idoc4a6mr8BDzTJY47LJhkJ8UB7WEGuduB/1aa)", "pkh(): Key path value '1aa' is not a valid uint32"); // Path is not valid uint
+    CheckUnparsable("pkh(xprv9s21ZrQH143K31xYSDQpPDxsXRTUcvj2iNHm5NUtrGiGG5e2DtALGdso3pGz6ssrdK4PFmM8NSpSBHNqPqm55Qn3LqFtT2emdEXVYsCzC2U/+1)", "pkh(xpub661MyMwAqRbcFW31YEwpkMuc5THy2PSt5bDMsktWQcFF8syAmRUapSCGu8ED9W6oDMSgv6Zz8idoc4a6mr8BDzTJY47LJhkJ8UB7WEGuduB/+1)", "pkh(): Key path value '+1' is not a valid uint32"); // Path is not valid uint
     Check("pkh([01234567/10/20]xprv9s21ZrQH143K31xYSDQpPDxsXRTUcvj2iNHm5NUtrGiGG5e2DtALGdso3pGz6ssrdK4PFmM8NSpSBHNqPqm55Qn3LqFtT2emdEXVYsCzC2U/2147483647'/0)", "pkh([01234567/10/20]xpub661MyMwAqRbcFW31YEwpkMuc5THy2PSt5bDMsktWQcFF8syAmRUapSCGu8ED9W6oDMSgv6Zz8idoc4a6mr8BDzTJY47LJhkJ8UB7WEGuduB/2147483647'/0)", "pkh([01234567/10/20/2147483647h]xpub69H7F5dQzmVd3vPuLKtcXJziMEQByuDidnX3YdwgtNsecY5HRGtAAQC5mXTt4dsv9RzyjgDjAQs9VGVV6ydYCHnprc9vvaA5YtqWyL6hyds/0)", HARDENED, {{"76a914ebdc90806a9c4356c1c88e42216611e1cb4c1c1788ac"}}, OutputType::LEGACY, /*op_desc_id=*/std::nullopt, {{10, 20, 0xFFFFFFFFUL, 0}});
 
     // Multipath versions with BIP32 derivations