From aa6e58b58b15aacc7c43d22224c4561f222c87e4 Mon Sep 17 00:00:00 2001
From: fengzero <fengzero@fengzero.com>
Date: Thu, 21 Oct 2021 10:04:04 +0000
Subject: [PATCH] modbus: limit read reg count

---
 plugins/modbus/modbus_point.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/plugins/modbus/modbus_point.c b/plugins/modbus/modbus_point.c
index 44c7871f..e7f864be 100644
--- a/plugins/modbus/modbus_point.c
+++ b/plugins/modbus/modbus_point.c
@@ -437,7 +437,8 @@ static void insert_cmd(modbus_point_context_t *ctx, modbus_point_t *point)
     for (int i = 0; i < ctx->n_cmd; i++) {
         if (ctx->cmds[i].device == point->device &&
             ctx->cmds[i].function == function) {
-            if (ctx->cmds[i].start_addr + ctx->cmds[i].n_reg == point->addr) {
+            if (ctx->cmds[i].start_addr + ctx->cmds[i].n_reg == point->addr &&
+                ctx->cmds[i].n_reg < 126) {
                 exist = true;
                 if (point->value.type == MODBUS_B32) {
                     ctx->cmds[i].n_reg += 2;