RebuildMap: handle missing disks

When rebuilding the map file tolerate missing/offline disks, otherwise
we will segfault on the NULL return from sysfs_read.

Reported-by: Jacek Danecki <jacek.danecki@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/mapfile.c b/mapfile.c
index ca7072e..f276232 100644
--- a/mapfile.c
+++ b/mapfile.c
@@ -294,9 +294,12 @@ void RebuildMap(void)
 	int mdp = get_mdp_major();
 
 	for (md = mdstat ; md ; md = md->next) {
-		struct mdinfo *sra = sysfs_read(-1, md->devnum, GET_DEVS);
+		struct mdinfo *sra = sysfs_read(-1, md->devnum, GET_DEVS|SKIP_GONE_DEVS);
 		struct mdinfo *sd;
 
+		if (!sra)
+			continue;
+
 		for (sd = sra->devs ; sd ; sd = sd->next) {
 			char dn[30];
 			int dfd;