Merge branch 'fix/attribute_metadata_size' into 'main'

bugfix: fix the decreasing of attribute metadate size after reboot

See merge request app-frameworks/esp-matter!512

components/esp_matter/private/esp_matter_nvs.cpp

@@ -48,15 +48,18 @@ esp_err_t get_val_from_nvs(uint16_t endpoint_id, uint32_t cluster_id, uint32_t a
         val.type == ESP_MATTER_VAL_TYPE_ARRAY) {
         size_t len = 0;
         if ((err = nvs_get_blob(handle, attribute_key, NULL, &len)) == ESP_OK) {
+            // This function will only be called when recovering the non-volatile attributes during reboot
+            // Add we should not decrease the size of the attribute value
+            len = std::max(len, static_cast<size_t>(val.val.a.s));
             uint8_t *buffer = (uint8_t *)esp_matter_mem_calloc(1, len);
             if (!buffer) {
                 err = ESP_ERR_NO_MEM;
             } else {
-                nvs_get_blob(handle, attribute_key, buffer, &len);
                 val.val.a.b = buffer;
                 val.val.a.n = len;
                 val.val.a.t = len + (val.val.a.t - val.val.a.s);
                 val.val.a.s = len;
+                nvs_get_blob(handle, attribute_key, buffer, &len);
             }
         }
     } else {