From b4ecfb527c85c1dacde8a14b174c378316d913d8 Mon Sep 17 00:00:00 2001
From: "S.J.R. van Schaik" <stephan@whiteboxsystems.nl>
Date: Tue, 19 Sep 2017 16:19:01 +0200
Subject: [PATCH] ftl: check magic in read_page_group()

---
 source/ftl/map.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/source/ftl/map.c b/source/ftl/map.c
index 5c15857..9f7ca04 100644
--- a/source/ftl/map.c
+++ b/source/ftl/map.c
@@ -75,6 +75,9 @@ int read_page_group(struct ftl_map *map,
 	if (flash_read(map->dev, addr, group, sizeof *group) == 0)
 		return -1;
 
+	if (memcmp(group->magic, "FTL", 3) != 0)
+		return -1;
+
 	return 0;
 }