[openthread][ethernet][wifi] Add IPv6 address array bounds assert (#14488)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

esphome/components/ethernet/ethernet_component.cpp

@@ -470,6 +470,7 @@ network::IPAddresses EthernetComponent::get_ip_addresses() {
   uint8_t count = 0;
   count = esp_netif_get_all_ip6(this->eth_netif_, if_ip6s);
   assert(count <= CONFIG_LWIP_IPV6_NUM_ADDRESSES);
+  assert(count < addresses.size());
   for (int i = 0; i < count; i++) {
     addresses[i + 1] = network::IPAddress(&if_ip6s[i]);
   }

esphome/components/openthread/openthread.h

@@ -90,7 +90,7 @@ class InstanceLock {
   otInstance *get_instance();
 
  private:
-  // Use a private constructor in order to force thehandling
+  // Use a private constructor in order to force the handling
   // of acquisition failure
   InstanceLock() {}
 };

esphome/components/openthread/openthread_esp.cpp

@@ -197,6 +197,7 @@ network::IPAddresses OpenThreadComponent::get_ip_addresses() {
   esp_netif_t *netif = esp_netif_get_default_netif();
   count = esp_netif_get_all_ip6(netif, if_ip6s);
   assert(count <= CONFIG_LWIP_IPV6_NUM_ADDRESSES);
+  assert(count < addresses.size());
   for (int i = 0; i < count; i++) {
     addresses[i + 1] = network::IPAddress(&if_ip6s[i]);
   }

esphome/components/wifi/wifi_component_esp8266.cpp

@@ -6,6 +6,7 @@
 
 #include <user_interface.h>
 
+#include <cassert>
 #include <utility>
 #include <algorithm>
 #ifdef USE_WIFI_WPA2_EAP
@@ -205,6 +206,7 @@ network::IPAddresses WiFiComponent::wifi_sta_ip_addresses() {
   network::IPAddresses addresses;
   uint8_t index = 0;
   for (auto &addr : addrList) {
+    assert(index < addresses.size());
     addresses[index++] = addr.ipFromNetifNum();
   }
   return addresses;

esphome/components/wifi/wifi_component_esp_idf.cpp

@@ -585,6 +585,7 @@ network::IPAddresses WiFiComponent::wifi_sta_ip_addresses() {
   uint8_t count = 0;
   count = esp_netif_get_all_ip6(s_sta_netif, if_ip6s);
   assert(count <= CONFIG_LWIP_IPV6_NUM_ADDRESSES);
+  assert(count < addresses.size());
   for (int i = 0; i < count; i++) {
     addresses[i + 1] = network::IPAddress(&if_ip6s[i]);
   }

esphome/components/wifi/wifi_component_pico_w.cpp

@@ -3,6 +3,8 @@
 #ifdef USE_WIFI
 #ifdef USE_RP2040
 
+#include <cassert>
+
 #include "lwip/dns.h"
 #include "lwip/err.h"
 #include "lwip/netif.h"
@@ -285,6 +287,7 @@ network::IPAddresses WiFiComponent::wifi_sta_ip_addresses() {
     if (ip == ap_ip) {
       continue;
     }
+    assert(index < addresses.size());
     addresses[index++] = ip;
   }
   return addresses;