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psbt: Check Taproot tree depth and leaf versions

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Since TaprootBuilder has assertions for the depth and leaf versions, the
PSBT decoder should check these values before calling
TaprootBuilder::Add so that the assertions are not triggered on
malformed taproot trees.
This commit is contained in:
Andrew Chow
2022-06-30 11:08:44 -04:00
parent b6cf0f8848
commit 76fb300b63
1 changed files with 6 additions and 0 deletions
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6
src/psbt.h
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@@ -866,6 +866,12 @@ struct PSBTOutput
s_tree >> depth;
s_tree >> leaf_ver;
s_tree >> script;
if (depth > TAPROOT_CONTROL_MAX_NODE_COUNT) {
throw std::ios_base::failure("Output Taproot tree has as leaf greater than Taproot maximum depth");
}
if ((leaf_ver & ~TAPROOT_LEAF_MASK) != 0) {
throw std::ios_base::failure("Output Taproot tree has a leaf with an invalid leaf version");
}
m_tap_tree->Add((int)depth, script, (int)leaf_ver, true /* track */);
}
if (!m_tap_tree->IsComplete()) {