From 2f5b7644e4da27383bb2e7a9f5b7fafc53ffef86 Mon Sep 17 00:00:00 2001
From: Daniele Lacamera <dan@danielinux.net>
Date: Fri, 6 Dec 2024 07:59:37 +0100
Subject: [PATCH] Fix offset updating trailer: swap_and_final_erase

When wolfBoot_swap_and_final_erase() is invoked, it was calculating the
wrong offset, ending up erasing the third-last sector of the boot
partition.

This might cause erasing part of the firmware, eventually causing failed
boot.
---
 src/update_flash.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/update_flash.c b/src/update_flash.c
index 20cc67cc0..694518eb7 100644
--- a/src/update_flash.c
+++ b/src/update_flash.c
@@ -218,8 +218,7 @@ static int wolfBoot_swap_and_final_erase(int resume)
 #endif
     );
     int swapDone = 0;
-    uintptr_t tmpBootPos = WOLFBOOT_PARTITION_SIZE - eraseLen -
-        WOLFBOOT_SECTOR_SIZE;
+    uintptr_t tmpBootPos = WOLFBOOT_PARTITION_SIZE - eraseLen;
     uint32_t tmpBuffer[TRAILER_OFFSET_WORDS + 1];
 
     /* open partitions (ignore failure) */