Merge bitcoin/bitcoin#23795: refactor: Remove implicit-integer-sign-change suppressions in validation

fadd730 refactor: Remove implicit-integer-sign-change suppressions in validation.cpp (MarcoFalke)

Pull request description:

  A file-wide suppression is problematic because it will wave through future violations, potentially bugs.

  Fix that by using per-statement casts.

ACKs for top commit:
  shaavan:
    ACK fadd730
  theStack:
    Code-review ACK fadd730

Tree-SHA512: a8a05613be35382b92d7970f958a4e8f4332432056eaa9d72f6719495134b93aaaeea692899d9035654d0e0cf56bcd759671eeeacfd0535582c0ea048ab58a56

Author: MarcoFalke

src/validation.cpp

@@ -2182,7 +2182,7 @@ CoinsCacheSizeState CChainState::GetCoinsCacheSizeState(
     const int64_t nMempoolUsage = m_mempool ? m_mempool->DynamicMemoryUsage() : 0;
     int64_t cacheSize = CoinsTip().DynamicMemoryUsage();
     int64_t nTotalSpace =
-        max_coins_cache_size_bytes + std::max<int64_t>(max_mempool_size_bytes - nMempoolUsage, 0);
+        max_coins_cache_size_bytes + std::max<int64_t>(int64_t(max_mempool_size_bytes) - nMempoolUsage, 0);
 
     //! No need to periodic flush if at least this much space still available.
     static constexpr int64_t MAX_BLOCK_COINSDB_USAGE_BYTES = 10 * 1024 * 1024;  // 10MB
@@ -3620,7 +3620,7 @@ bool CChainState::AcceptBlock(const std::shared_ptr<const CBlock>& pblock, Block
     // blocks which are too close in height to the tip.  Apply this test
     // regardless of whether pruning is enabled; it should generally be safe to
     // not process unrequested blocks.
-    bool fTooFarAhead = (pindex->nHeight > int(m_chain.Height() + MIN_BLOCKS_TO_KEEP));
+    bool fTooFarAhead{pindex->nHeight > m_chain.Height() + int(MIN_BLOCKS_TO_KEEP)};
 
     // TODO: Decouple this function from the block download logic by removing fRequested
     // This requires some new chain data structure to efficiently look up if a
@@ -3842,7 +3842,7 @@ void BlockManager::FindFilesToPrune(std::set<int>& setFilesToPrune, uint64_t nPr
         return;
     }
 
-    unsigned int nLastBlockWeCanPrune = std::min(prune_height, chain_tip_height - static_cast<int>(MIN_BLOCKS_TO_KEEP));
+    unsigned int nLastBlockWeCanPrune{(unsigned)std::min(prune_height, chain_tip_height - static_cast<int>(MIN_BLOCKS_TO_KEEP))};
     uint64_t nCurrentUsage = CalculateCurrentUsage();
     // We don't check to prune until after we've allocated new space for files
     // So we should leave a buffer under our target to account for another allocation
@@ -4442,8 +4442,8 @@ void CChainState::LoadExternalBlockFile(FILE* fileIn, FlatFilePos* dbp)
             try {
                 // locate a header
                 unsigned char buf[CMessageHeader::MESSAGE_START_SIZE];
-                blkdat.FindByte(m_params.MessageStart()[0]);
-                nRewind = blkdat.GetPos()+1;
+                blkdat.FindByte(char(m_params.MessageStart()[0]));
+                nRewind = blkdat.GetPos() + 1;
                 blkdat >> buf;
                 if (memcmp(buf, m_params.MessageStart(), CMessageHeader::MESSAGE_START_SIZE)) {
                     continue;

test/sanitizer_suppressions/ubsan

@@ -77,7 +77,6 @@ implicit-integer-sign-change:test/skiplist_tests.cpp
 implicit-integer-sign-change:test/streams_tests.cpp
 implicit-integer-sign-change:test/transaction_tests.cpp
 implicit-integer-sign-change:txmempool.cpp
-implicit-integer-sign-change:validation.cpp
 implicit-integer-sign-change:zmq/zmqpublishnotifier.cpp
 implicit-signed-integer-truncation,implicit-integer-sign-change:chain.h
 implicit-signed-integer-truncation,implicit-integer-sign-change:test/skiplist_tests.cpp