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Off-by-one wallet decoy selection bug fix #1642

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Off-by-one wallet decoy selection bug fix #1642

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7 changes: 4 additions & 3 deletions src/wallet/wallet2.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1268,7 +1268,8 @@ gamma_picker::gamma_picker(const std::vector<uint64_t>& rct_offsets, double shap
? rct_offsets[rct_offsets.size() - blocks_to_consider - 1]
: 0);
begin = rct_offsets.data();
end = rct_offsets.data() + rct_offsets.size() - DEFAULT_TX_SPENDABLE_AGE;
end = rct_offsets.data() + rct_offsets.size() -
(std::max(1, CRYPTONOTE_DEFAULT_TX_SPENDABLE_AGE) - 1);
num_rct_outputs = *(end - 1);
THROW_WALLET_EXCEPTION_IF(num_rct_outputs == 0, error::wallet_internal_error, "No rct outputs");
average_output_time =
Expand Down Expand Up @@ -10599,7 +10600,7 @@ void wallet2::get_outs(
} else {
// the base offset of the first rct output in the first unlocked block (or the one
// to be if there's none)
num_outs = rct_offsets[rct_offsets.size() - DEFAULT_TX_SPENDABLE_AGE];
num_outs = gamma->get_num_rct_outs();
log::info(logcat, "{} unlocked rct outputs", num_outs);
THROW_WALLET_EXCEPTION_IF(
num_outs == 0,
Expand Down Expand Up @@ -10923,7 +10924,7 @@ void wallet2::get_outs(
}
bool use_histogram = amount != 0 || !has_rct_distribution;
if (!use_histogram)
num_outs = rct_offsets[rct_offsets.size() - DEFAULT_TX_SPENDABLE_AGE];
num_outs = gamma->get_num_rct_outs();

// make sure the real outputs we asked for are really included, along
// with the correct key and mask: this guards against an active attack
Expand Down
1 change: 1 addition & 0 deletions src/wallet/wallet2.h
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Original file line number Diff line number Diff line change
Expand Up @@ -105,6 +105,7 @@ class gamma_picker {
uint64_t pick();
gamma_picker(const std::vector<uint64_t>& rct_offsets);
gamma_picker(const std::vector<uint64_t>& rct_offsets, double shape, double scale);
uint64_t get_num_rct_outs() const { return num_rct_outputs; }

private:
struct gamma_engine {
Expand Down