From 691a0237809b5364117446a8a9b0cceeb0a747c1 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 02/10] [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 bdbab3f..dbc7a80 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)) {

-- 

1.8.3.1