From 06d8564273a1ca5c5cc98aae5d6c724a7033ca49 Mon Sep 17 00:00:00 2001
From: Kevin Heifner <heifnerk@objectcomputing.com>
Date: Wed, 6 Dec 2023 07:25:07 -0600
Subject: [PATCH] GH-1953 return failure when n==0

---
 libraries/chain/webassembly/crypto.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/libraries/chain/webassembly/crypto.cpp b/libraries/chain/webassembly/crypto.cpp
index fb99fae07f..470cc3b28a 100644
--- a/libraries/chain/webassembly/crypto.cpp
+++ b/libraries/chain/webassembly/crypto.cpp
@@ -284,7 +284,7 @@ namespace eosio { namespace chain { namespace webassembly {
    }
 
    int32_t interface::bls_g1_weighted_sum(span<const char> points, span<const char> scalars, const uint32_t n, span<char> result) const {
-      if(points.size() != n*96 ||  scalars.size() != n*32 ||  result.size() != 96)
+      if(n == 0 || points.size() != n*96 ||  scalars.size() != n*32 ||  result.size() != 96)
          return return_code::failure;
 
       // Use much efficient scale for the special case of n == 1.
@@ -319,7 +319,7 @@ namespace eosio { namespace chain { namespace webassembly {
    }
 
    int32_t interface::bls_g2_weighted_sum(span<const char> points, span<const char> scalars, const uint32_t n, span<char> result) const {
-      if(points.size() != n*192 ||  scalars.size() != n*32 ||  result.size() != 192)
+      if(n == 0 || points.size() != n*192 ||  scalars.size() != n*32 ||  result.size() != 192)
          return return_code::failure;
 
       // Use much efficient scale for the special case of n == 1.
@@ -354,7 +354,7 @@ namespace eosio { namespace chain { namespace webassembly {
    }
 
    int32_t interface::bls_pairing(span<const char> g1_points, span<const char> g2_points, const uint32_t n, span<char> result) const {
-      if(g1_points.size() != n*96 ||  g2_points.size() != n*192 ||  result.size() != 576)
+      if(n == 0 || g1_points.size() != n*96 ||  g2_points.size() != n*192 ||  result.size() != 576)
          return return_code::failure;
       std::vector<std::tuple<bls12_381::g1, bls12_381::g2>> v;
       v.reserve(n);