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extended keys: fail to derive too large depth instead of wrapping around

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This issue was reported to me by Marco Falke, and found with the
descriptor_parse fuzz target.
This commit is contained in:
Antoine Poinsot 2022-07-19 11:58:16 +02:00
parent 8dc6670ce1
commit fb9faffae3
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GPG key ID: E13FC145CD3F4304
3 changed files with 20 additions and 0 deletions
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src/key.cpp
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@ -333,6 +333,7 @@ bool CKey::Derive(CKey& keyChild, ChainCode &ccChild, unsigned int nChild, const
}
bool CExtKey::Derive(CExtKey &out, unsigned int _nChild) const {
if (nDepth == std::numeric_limits<unsigned char>::max()) return false;
out.nDepth = nDepth + 1;
CKeyID id = key.GetPubKey().GetID();
memcpy(out.vchFingerprint, &id, 4);