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blockchain: sanity check number of precomputed hash of hash blocks

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Coverity 142951
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moneromooo-monero 2018-02-02 16:50:35 +00:00
parent 9af6b2d1b8
commit 61defd89e3
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GPG key ID: 686F07454D6CEFC3
1 changed files with 6 additions and 1 deletions
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7
src/cryptonote_core/blockchain.cpp
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@ -4343,8 +4343,13 @@ void Blockchain::load_compiled_in_block_hashes()
{ {
const unsigned char *p = get_blocks_dat_start(m_testnet); const unsigned char *p = get_blocks_dat_start(m_testnet);
const uint32_t nblocks = *p | ((*(p+1))<<8) | ((*(p+2))<<16) | ((*(p+3))<<24); const uint32_t nblocks = *p | ((*(p+1))<<8) | ((*(p+2))<<16) | ((*(p+3))<<24);
if (nblocks > (std::numeric_limits<uint32_t>::max() - 4) / sizeof(hash))
{
MERROR("Block hash data is too large");
return;
}
const size_t size_needed = 4 + nblocks * sizeof(crypto::hash); const size_t size_needed = 4 + nblocks * sizeof(crypto::hash);
if(nblocks > 0 && nblocks * HASH_OF_HASHES_STEP > m_db->height() && get_blocks_dat_size(m_testnet) >= size_needed) if(nblocks > 0 && nblocks > (m_db->height() + HASH_OF_HASHES_STEP - 1) / HASH_OF_HASHES_STEP && get_blocks_dat_size(m_testnet) >= size_needed)
{ {
p += sizeof(uint32_t); p += sizeof(uint32_t);
m_blocks_hash_of_hashes.reserve(nblocks); m_blocks_hash_of_hashes.reserve(nblocks);