diff --git a/esp32/ftp/updater.c b/esp32/ftp/updater.c
index 41e9629188..29b57950bc 100644
--- a/esp32/ftp/updater.c
+++ b/esp32/ftp/updater.c
@@ -123,6 +123,14 @@ bool updater_write (uint8_t *buf, uint32_t len) {
// the actual writing into flash, not-encrypted,
// because it already came encrypted from OTA server
+ if (updater_data.offset == 0) {
+ ESP_LOGE(TAG, "OTA start not called\n");
+ return false;
+ }
+ if ((boot_info.size + len) > IMG_SIZE) {
+ ESP_LOGE(TAG, "OTA write attempt > partition\n");
+ return false;
+ }
if (ESP_OK != updater_spi_flash_write(updater_data.offset, (void *)buf, len, false)) {
ESP_LOGE(TAG, "SPI flash write failed\n");
return false;
@@ -132,7 +140,8 @@ bool updater_write (uint8_t *buf, uint32_t len) {
updater_data.current_chunk += len;
boot_info.size += len;
- if (updater_data.current_chunk >= SPI_FLASH_SEC_SIZE) {
+ if ((updater_data.current_chunk >= SPI_FLASH_SEC_SIZE) &&
+ (boot_info.size <= (IMG_SIZE - SPI_FLASH_SEC_SIZE))) {
updater_data.current_chunk -= SPI_FLASH_SEC_SIZE;
// erase the next sector
if (ESP_OK != spi_flash_erase_sector((updater_data.offset + SPI_FLASH_SEC_SIZE) / SPI_FLASH_SEC_SIZE)) {
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