diff options
| -rw-r--r-- | src/merkleblock.cpp | 3 | ||||
| -rw-r--r-- | src/merkleblock.h | 2 |
2 files changed, 5 insertions, 0 deletions
diff --git a/src/merkleblock.cpp b/src/merkleblock.cpp index ba5f7b400c..f0abea0611 100644 --- a/src/merkleblock.cpp +++ b/src/merkleblock.cpp @@ -59,6 +59,9 @@ CMerkleBlock::CMerkleBlock(const CBlock& block, const std::set<uint256>& txids) } uint256 CPartialMerkleTree::CalcHash(int height, unsigned int pos, const std::vector<uint256> &vTxid) { + //we can never have zero txs in a merkle block, we always need the coinbase tx + //if we do not have this assert, we can hit a memory access violation when indexing into vTxid + assert(vTxid.size() != 0); if (height == 0) { // hash at height 0 is the txids themself return vTxid[pos]; diff --git a/src/merkleblock.h b/src/merkleblock.h index de4c5c8d29..f590c487de 100644 --- a/src/merkleblock.h +++ b/src/merkleblock.h @@ -121,6 +121,8 @@ public: /** * Used to relay blocks as header + vector<merkle branch> * to filtered nodes. + * + * NOTE: The class assumes that the given CBlock has *at least* 1 transaction. If the CBlock has 0 txs, it will hit an assertion. */ class CMerkleBlock { |