From c82a4d59ee1564a2abad69b12f5a95ada8efdeed Mon Sep 17 00:00:00 2001
From: Shubham Kulkarni <shubham.kulkarni@espressif.com>
Date: Fri, 27 Mar 2020 19:37:53 +0530
Subject: [PATCH] esp_ota_ops.c: Fix size calculation to erase partition range
 for OTA image

Closes https://github.com/espressif/esp-idf/issues/4953
---
 components/app_update/esp_ota_ops.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/components/app_update/esp_ota_ops.c b/components/app_update/esp_ota_ops.c
index 51244b3d87..802ed943ff 100644
--- a/components/app_update/esp_ota_ops.c
+++ b/components/app_update/esp_ota_ops.c
@@ -157,7 +157,8 @@ esp_err_t esp_ota_begin(const esp_partition_t *partition, size_t image_size, esp
     if ((image_size == 0) || (image_size == OTA_SIZE_UNKNOWN)) {
         ret = esp_partition_erase_range(partition, 0, partition->size);
     } else {
-        ret = esp_partition_erase_range(partition, 0, (image_size / SPI_FLASH_SEC_SIZE + 1) * SPI_FLASH_SEC_SIZE);
+        const int aligned_erase_size = (image_size + SPI_FLASH_SEC_SIZE - 1) & ~(SPI_FLASH_SEC_SIZE - 1);
+        ret = esp_partition_erase_range(partition, 0, aligned_erase_size);
     }
 
     if (ret != ESP_OK) {