Update tx-size-small comment with relevant CVE disclosure

1 files changed, 2 insertions, 1 deletions

diff --git a/src/validation.cpp b/src/validation.cpp
index 6a9b0c95fb..5b195bf7da 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -461,7 +461,8 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
 
     // Do not work on transactions that are too small.
     // A transaction with 1 segwit input and 1 P2WPHK output has non-witness size of 82 bytes.
-    // Transactions smaller than this are not relayed to reduce unnecessary malloc overhead.
+    // Transactions smaller than this are not relayed to mitigate CVE-2017-12842 by not relaying
+    // 64-byte transactions.
     if (::GetSerializeSize(tx, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS) < MIN_STANDARD_TX_NONWITNESS_SIZE)
         return state.Invalid(ValidationInvalidReason::TX_NOT_STANDARD, false, REJECT_NONSTANDARD, "tx-size-small");