From 0004dced935879e190dd660e1f82f1d751454c78 Mon Sep 17 00:00:00 2001
From: Ming-Hung Tsai <mtsai@redhat.com>
Date: Tue, 1 Jun 2021 11:24:11 +0800
Subject: [PATCH] [thin_show_metadata] Fix out-of-bounds access

---
 thin-provisioning/thin_show_metadata.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/thin-provisioning/thin_show_metadata.cc b/thin-provisioning/thin_show_metadata.cc
index bdbab3f7..dbc7a80c 100644
--- a/thin-provisioning/thin_show_metadata.cc
+++ b/thin-provisioning/thin_show_metadata.cc
@@ -206,7 +206,8 @@ namespace {
 
 		void run() {
 			auto line_length = 80;
-			for (block_address b = 0; b < 2000; b++) {
+			block_address nr_blocks = std::min<block_address>(2000, bm_.get_nr_blocks());
+			for (block_address b = 0; b < nr_blocks; b++) {
 				block_manager::read_ref rr = bm_.read_lock(b);
 
 				if (!(b % line_length)) {