From 7232458b6c114cc83b471f08abc49fd1673831c4 Mon Sep 17 00:00:00 2001
From: Zdenek Kabelac <zkabelac@redhat.com>
Date: Tue, 25 Jun 2019 15:21:46 +0200
Subject: [PATCH] cov: validate pagesize is not negative

As _init_free_list() cannot accept negative numbers
---
 lib/device/bcache.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/device/bcache.c b/lib/device/bcache.c
index dac8be64d..ccf0046ba 100644
--- a/lib/device/bcache.c
+++ b/lib/device/bcache.c
@@ -1040,6 +1040,11 @@ 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 = sysconf(_SC_PAGESIZE)) < 0) {
+		log_warn("bcache cannot read pagesize.");
+		return NULL;
+	}
+
 	if (!nr_cache_blocks) {
 		log_warn("bcache must have at least one cache block");
 		return NULL;