From e500ece4d5ca69471d61f50d31f9f15fa4e66965 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@koston.org>
Date: Thu, 1 Oct 2026 13:35:01 -0500
Subject: [PATCH] [uart] Fix a maybe uninitialized warning in the fixed size
 read (#19988)

---
 esphome/components/uart/uart.h | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/esphome/components/uart/uart.h b/esphome/components/uart/uart.h
index eda5b72ea8..d1c6773363 100644
--- a/esphome/components/uart/uart.h
+++ b/esphome/components/uart/uart.h
@@ -37,9 +37,10 @@ class UARTDevice {
 
   bool read_array(uint8_t *data, size_t len) { return this->parent_->read_array(data, len); }
   template<size_t N> optional<std::array<uint8_t, N>> read_array() {  // NOLINT
-    std::array<uint8_t, N> res;
-    if (!this->read_array(res.data(), N)) {
-      return {};
+    // One object returned on both paths; a separate empty optional trips GCC's -Wmaybe-uninitialized.
+    optional<std::array<uint8_t, N>> res(std::in_place);
+    if (!this->read_array(res->data(), N)) {
+      res.reset();
     }
     return res;
   }