From 8f6e1abbcef66bb038f60699b59918688d443046 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Sat, 7 Feb 2026 00:18:51 +0100
Subject: [PATCH] Check read_array return value in drain_rx_buffer_

---
 esphome/components/dsmr/dsmr.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/esphome/components/dsmr/dsmr.cpp b/esphome/components/dsmr/dsmr.cpp
index be43384330..88cfff2e4b 100644
--- a/esphome/components/dsmr/dsmr.cpp
+++ b/esphome/components/dsmr/dsmr.cpp
@@ -122,7 +122,9 @@ void Dsmr::drain_rx_buffer_() {
   uint8_t buf[64];
   int avail;
   while ((avail = this->available()) > 0) {
-    this->read_array(buf, std::min(static_cast<size_t>(avail), sizeof(buf)));
+    if (!this->read_array(buf, std::min(static_cast<size_t>(avail), sizeof(buf)))) {
+      break;
+    }
   }
 }