--- mcs/class/corlib/Mono.Math/BigInteger.cs	2007-09-19 19:06:06.000000000 +0200
+++ mcs/class/corlib/Mono.Math/BigInteger.cs	2007-10-25 23:46:55.000000000 +0200
@@ -1607,7 +1607,7 @@
 						uint j = 1;
 
 						// Multiply and add
-						for (; j < m.length; j++) {
+						for (; j < m.length && j < A.length; j++) {
 							c += (ulong)u_i * (ulong)*(mP++) + *(aSP++);
 							*(aDP++) = (uint)c;
 							c >>= 32;
--- mcs/class/Mono.Security/Mono.Math/BigInteger.cs	2007-07-24 23:48:50.000000000 +0200
+++ mcs/class/Mono.Security/Mono.Math/BigInteger.cs	2007-10-25 23:45:01.000000000 +0200
@@ -1601,7 +1601,7 @@
 						uint j = 1;
 
 						// Multiply and add
-						for (; j < m.length; j++) {
+						for (; j < m.length && j < A.length; j++) {
 							c += (ulong)u_i * (ulong)*(mP++) + *(aSP++);
 							*(aDP++) = (uint)c;
 							c >>= 32;