From 7293532f7da651f569eb5c571deffd32d83d25ab Mon Sep 17 00:00:00 2001
From: xhlsa <126936838+xhlsa@users.noreply.github.com>
Date: Sun, 13 Sep 2026 19:36:24 -0700
Subject: [PATCH] flash: guard flashFlush() against a NULL flush callback

The M25P16/W25Q (NOR) drivers do not set flashVTable_t.flush, so
flashFlush() jumps through NULL and hard-faults on blackbox read or seek
on those chips. Also guard against no flash device being detected.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
---
 src/main/drivers/flash.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/main/drivers/flash.c b/src/main/drivers/flash.c
index 392c7680519..6dd51784d0b 100644
--- a/src/main/drivers/flash.c
+++ b/src/main/drivers/flash.c
@@ -129,7 +129,9 @@ int flashReadBytes(uint32_t address, uint8_t *buffer, int length)
 
 void flashFlush(void)
 {
-    flash->flush();
+    if (flash && flash->flush) {
+        flash->flush();
+    }
 }
 
 const flashGeometry_t *flashGetGeometry(void)