From 2784059a646587a00bb623dfd94e4f048378a4a5 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Mon, 9 Feb 2026 09:26:29 -0600
Subject: [PATCH] Keep early guard to avoid stack buffer allocation

---
 esphome/components/ld2412/ld2412.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/esphome/components/ld2412/ld2412.cpp b/esphome/components/ld2412/ld2412.cpp
index f8ceee78eb..a4099c45b1 100644
--- a/esphome/components/ld2412/ld2412.cpp
+++ b/esphome/components/ld2412/ld2412.cpp
@@ -310,8 +310,12 @@ void LD2412Component::restart_and_read_all_info() {
 }
 
 void LD2412Component::loop() {
-  // Read all available bytes in batches to reduce UART call overhead.
   int avail = this->available();
+  if (avail <= 0) {
+    return;
+  }
+
+  // Read all available bytes in batches to reduce UART call overhead.
   uint8_t buf[MAX_LINE_LENGTH];
   while (avail > 0) {
     size_t to_read = std::min(static_cast<size_t>(avail), sizeof(buf));