From 27a16ca97cedfc80b96fd1a8f76b66b9ffddae98 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Sun, 5 Apr 2026 18:54:39 -1000
Subject: [PATCH] [api] Use local pointer in encode_small_varint to avoid
 aliased pos_ stores

---
 esphome/components/api/proto.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/esphome/components/api/proto.h b/esphome/components/api/proto.h
index c4f965ed13..e3cecfcde6 100644
--- a/esphome/components/api/proto.h
+++ b/esphome/components/api/proto.h
@@ -280,8 +280,10 @@ class ProtoWriteBuffer {
    *  The tag is precomputed by the code generator. value must be < 128. */
   void encode_small_varint(uint8_t precomputed_tag, uint8_t value) {
     this->debug_check_bounds_(2);
-    *this->pos_++ = precomputed_tag;
-    *this->pos_++ = value;
+    auto *p = this->pos_;
+    p[0] = precomputed_tag;
+    p[1] = value;
+    this->pos_ = p + 2;
   }
   void encode_uint32(uint32_t field_id, uint32_t value, bool force = false) {
     if (value == 0 && !force)