blockchain: sanity check number of precomputed hash of hash blocks
Coverity 142951
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@ -4343,8 +4343,13 @@ void Blockchain::load_compiled_in_block_hashes()
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{
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const unsigned char *p = get_blocks_dat_start(m_testnet);
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const uint32_t nblocks = *p | ((*(p+1))<<8) | ((*(p+2))<<16) | ((*(p+3))<<24);
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if (nblocks > (std::numeric_limits<uint32_t>::max() - 4) / sizeof(hash))
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{
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MERROR("Block hash data is too large");
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return;
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}
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const size_t size_needed = 4 + nblocks * sizeof(crypto::hash);
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if(nblocks > 0 && nblocks * HASH_OF_HASHES_STEP > m_db->height() && get_blocks_dat_size(m_testnet) >= size_needed)
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if(nblocks > 0 && nblocks > (m_db->height() + HASH_OF_HASHES_STEP - 1) / HASH_OF_HASHES_STEP && get_blocks_dat_size(m_testnet) >= size_needed)
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{
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p += sizeof(uint32_t);
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m_blocks_hash_of_hashes.reserve(nblocks);
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