From 0049b42891ac6e095b91643320743a3c0a3ae882 Mon Sep 17 00:00:00 2001
From: root <root@localhost.localdomain>
Date: Wed, 13 Mar 2019 19:47:31 +0800
Subject: [PATCH 06/19] cov: add check for positive value

As pgsize parameter for _init_free_list() can't be negative,
report problem in case for any reason we would get negative number.
---
 lib/device/bcache.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/device/bcache.c b/lib/device/bcache.c
index 7384a32..0fc7364 100644
--- a/lib/device/bcache.c
+++ b/lib/device/bcache.c
@@ -1039,6 +1039,11 @@ struct bcache *bcache_create(sector_t block_sectors, unsigned nr_cache_blocks,
 	unsigned max_io = engine->max_io(engine);
 	long pgsize = sysconf(_SC_PAGESIZE);
 
+	if (pgsize < 0) {
+		log_warn("WARNING: _SC_PAGESIZE returns negative value.");
+		return NULL;
+	}
+
 	if (!nr_cache_blocks) {
 		log_warn("bcache must have at least one cache block");
 		return NULL;
-- 
2.19.1

