From 7172423f055834c0730bcc9bcd09d4faa858d46a Mon Sep 17 00:00:00 2001
From: "S.J.R. van Schaik" <stephan@whiteboxsystems.nl>
Date: Fri, 26 May 2017 16:10:12 +0200
Subject: [PATCH] ftl: compute length after determining the offset

---
 source/ftl/ftl.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/source/ftl/ftl.c b/source/ftl/ftl.c
index 9f8d1d3..637bbaf 100644
--- a/source/ftl/ftl.c
+++ b/source/ftl/ftl.c
@@ -28,11 +28,10 @@ size_t ftl_read(struct ftl_map *map, void *data, size_t len, uint32_t va)
 	if (!data)
 		return 0;
 
-	len = min(len, (1 << map->log2_page_size) - offset);
-
 	mask = ((1 << map->log2_page_size) - 1);
 	offset = va & mask;
 	va >>= map->log2_page_size;
+	len = min(len, (1 << map->log2_page_size) - offset);
 
 	if ((ret = trace_path(map, NULL, &page, va)) < 0) {
 		memset(data, 0, len);