reject MIB operands in ZydisCalcAbsoluteAddressEx

MIB operands (BNDLDX/BNDSTX/BNDMK) have MPX-specific addressing semantics
that don't map to a single effective address, so return
ZYAN_STATUS_INVALID_ARGUMENT instead of computing a misleading value.

Author: dxbjavid

src/Utils.c

@@ -144,6 +144,14 @@ ZyanStatus ZydisCalcAbsoluteAddressEx(const ZydisDecodedInstruction* instruction
         return ZYAN_STATUS_INVALID_ARGUMENT;
     }
 
+    // `MIB` operands (`BNDLDX`/`BNDSTX`/`BNDMK`) have `MPX`-specific addressing semantics that
+    // don't map to a single effective address, so they are not supported here
+    if ((operand->type == ZYDIS_OPERAND_TYPE_MEMORY) &&
+        (operand->mem.type == ZYDIS_MEMOP_TYPE_MIB))
+    {
+        return ZYAN_STATUS_INVALID_ARGUMENT;
+    }
+
     if ((operand->type != ZYDIS_OPERAND_TYPE_REGISTER) &&
         ((operand->type != ZYDIS_OPERAND_TYPE_MEMORY) ||
         ((operand->mem.base == ZYDIS_REGISTER_NONE) &&