aboutsummaryrefslogtreecommitdiff
path: root/src/bloom.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/bloom.cpp')
-rw-r--r--src/bloom.cpp26
1 files changed, 3 insertions, 23 deletions
diff --git a/src/bloom.cpp b/src/bloom.cpp
index 30af507243..54fcf487e4 100644
--- a/src/bloom.cpp
+++ b/src/bloom.cpp
@@ -31,8 +31,6 @@ CBloomFilter::CBloomFilter(const unsigned int nElements, const double nFPRate, c
* Again, we ignore filter parameters which will create a bloom filter with more hash functions than the protocol limits
* See https://en.wikipedia.org/wiki/Bloom_filter for an explanation of these formulas
*/
- isFull(false),
- isEmpty(true),
nHashFuncs(std::min((unsigned int)(vData.size() * 8 / nElements * LN2), MAX_HASH_FUNCS)),
nTweak(nTweakIn),
nFlags(nFlagsIn)
@@ -47,7 +45,7 @@ inline unsigned int CBloomFilter::Hash(unsigned int nHashNum, const std::vector<
void CBloomFilter::insert(const std::vector<unsigned char>& vKey)
{
- if (isFull)
+ if (vData.empty()) // Avoid divide-by-zero (CVE-2013-5700)
return;
for (unsigned int i = 0; i < nHashFuncs; i++)
{
@@ -55,7 +53,6 @@ void CBloomFilter::insert(const std::vector<unsigned char>& vKey)
// Sets bit nIndex of vData
vData[nIndex >> 3] |= (1 << (7 & nIndex));
}
- isEmpty = false;
}
void CBloomFilter::insert(const COutPoint& outpoint)
@@ -74,10 +71,8 @@ void CBloomFilter::insert(const uint256& hash)
bool CBloomFilter::contains(const std::vector<unsigned char>& vKey) const
{
- if (isFull)
+ if (vData.empty()) // Avoid divide-by-zero (CVE-2013-5700)
return true;
- if (isEmpty)
- return false;
for (unsigned int i = 0; i < nHashFuncs; i++)
{
unsigned int nIndex = Hash(i, vKey);
@@ -112,10 +107,8 @@ bool CBloomFilter::IsRelevantAndUpdate(const CTransaction& tx)
bool fFound = false;
// Match if the filter contains the hash of tx
// for finding tx when they appear in a block
- if (isFull)
+ if (vData.empty()) // zero-size = "match-all" filter
return true;
- if (isEmpty)
- return false;
const uint256& hash = tx.GetHash();
if (contains(hash))
fFound = true;
@@ -177,19 +170,6 @@ bool CBloomFilter::IsRelevantAndUpdate(const CTransaction& tx)
return false;
}
-void CBloomFilter::UpdateEmptyFull()
-{
- bool full = true;
- bool empty = true;
- for (unsigned int i = 0; i < vData.size(); i++)
- {
- full &= vData[i] == 0xff;
- empty &= vData[i] == 0;
- }
- isFull = full;
- isEmpty = empty;
-}
-
CRollingBloomFilter::CRollingBloomFilter(const unsigned int nElements, const double fpRate)
{
double logFpRate = log(fpRate);