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wallet2: guard against overflowing of subaddress indices

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moneromooo-monero 2018-03-01 14:16:34 +00:00
parent e9f41e405f
commit 5f85cc7e3d
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GPG key ID: 686F07454D6CEFC3
1 changed files with 14 additions and 3 deletions
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17
src/wallet/wallet2.cpp
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@ -582,6 +582,14 @@ tools::wallet2::tx_construction_data get_construction_data_with_decrypted_short_
return construction_data; return construction_data;
} }
uint32_t get_subaddress_clamped_sum(uint32_t idx, uint32_t extra)
{
static constexpr uint32_t uint32_max = std::numeric_limits<uint32_t>::max();
if (idx > uint32_max - extra)
return uint32_max;
return idx + extra;
}
//----------------------------------------------------------------- //-----------------------------------------------------------------
} //namespace } //namespace
@ -876,9 +884,10 @@ void wallet2::expand_subaddresses(const cryptonote::subaddress_index& index)
{ {
// add new accounts // add new accounts
cryptonote::subaddress_index index2; cryptonote::subaddress_index index2;
for (index2.major = m_subaddress_labels.size(); index2.major < index.major + m_subaddress_lookahead_major; ++index2.major) const uint32_t major_end = get_subaddress_clamped_sum(index.major, m_subaddress_lookahead_major);
for (index2.major = m_subaddress_labels.size(); index2.major < major_end; ++index2.major)
{ {
const uint32_t end = (index2.major == index.major ? index.minor : 0) + m_subaddress_lookahead_minor; const uint32_t end = get_subaddress_clamped_sum((index2.major == index.major ? index.minor : 0), m_subaddress_lookahead_minor);
const std::vector<crypto::public_key> pkeys = cryptonote::get_subaddress_spend_public_keys(m_account.get_keys(), index2.major, 0, end, hwdev); const std::vector<crypto::public_key> pkeys = cryptonote::get_subaddress_spend_public_keys(m_account.get_keys(), index2.major, 0, end, hwdev);
for (index2.minor = 0; index2.minor < end; ++index2.minor) for (index2.minor = 0; index2.minor < end; ++index2.minor)
{ {
@ -892,7 +901,7 @@ void wallet2::expand_subaddresses(const cryptonote::subaddress_index& index)
else if (m_subaddress_labels[index.major].size() <= index.minor) else if (m_subaddress_labels[index.major].size() <= index.minor)
{ {
// add new subaddresses // add new subaddresses
const uint32_t end = index.minor + m_subaddress_lookahead_minor; const uint32_t end = get_subaddress_clamped_sum(index.minor, m_subaddress_lookahead_minor);
const uint32_t begin = m_subaddress_labels[index.major].size(); const uint32_t begin = m_subaddress_labels[index.major].size();
cryptonote::subaddress_index index2 = {index.major, begin}; cryptonote::subaddress_index index2 = {index.major, begin};
const std::vector<crypto::public_key> pkeys = cryptonote::get_subaddress_spend_public_keys(m_account.get_keys(), index2.major, index2.minor, end, hwdev); const std::vector<crypto::public_key> pkeys = cryptonote::get_subaddress_spend_public_keys(m_account.get_keys(), index2.major, index2.minor, end, hwdev);
@ -924,6 +933,8 @@ void wallet2::set_subaddress_label(const cryptonote::subaddress_index& index, co
//---------------------------------------------------------------------------------------------------- //----------------------------------------------------------------------------------------------------
void wallet2::set_subaddress_lookahead(size_t major, size_t minor) void wallet2::set_subaddress_lookahead(size_t major, size_t minor)
{ {
THROW_WALLET_EXCEPTION_IF(major > 0xffffffff, error::wallet_internal_error, "Subaddress major lookahead is too large");
THROW_WALLET_EXCEPTION_IF(minor > 0xffffffff, error::wallet_internal_error, "Subaddress minor lookahead is too large");
m_subaddress_lookahead_major = major; m_subaddress_lookahead_major = major;
m_subaddress_lookahead_minor = minor; m_subaddress_lookahead_minor = minor;
} }