Revert "remove useless memset"

This reverts commit 3dc5ff5.

Author: airween

apache2/re_operators.c

@@ -630,25 +630,35 @@ static int msre_op_rsub_execute(modsec_rec *msr, msre_rule *rule, msre_var *var,
     }
 
     if(msr->stream_input_data != NULL && input_body == 1) {
+        memset(msr->stream_input_data, 0x0, msr->stream_input_length);
         free(msr->stream_input_data);
         msr->stream_input_data = NULL;
         msr->stream_input_length = 0;
 #ifdef MSC_LARGE_STREAM_INPUT
         msr->stream_input_allocated_length  = 0;
-#endif
+
+        msr->stream_input_data = (char *)malloc(size);
+#else
         msr->stream_input_data = (char *)malloc(size+1);
+#endif
+
         if(msr->stream_input_data == NULL)  {
             return -1;
         }
 
         msr->stream_input_length = size;
 #ifdef MSC_LARGE_STREAM_INPUT
         msr->stream_input_allocated_length = size;
+        memset(msr->stream_input_data, 0x0, size);
+#else
+        memset(msr->stream_input_data, 0x0, size+1);
 #endif
         msr->if_stream_changed = 1;
 
         memcpy(msr->stream_input_data, data, size);
+#ifndef MSC_LARGE_STREAM_INPUT
         msr->stream_input_data[size] = '\0';
+#endif
 
         var->value_len = size;
         var->value = msr->stream_input_data;