From bf1dfea393b5372b6fe058458c2fc25188e8181b Mon Sep 17 00:00:00 2001
From: "Bryn M. Reeves" <bmr@redhat.com>
Date: Wed, 6 Jul 2016 16:29:06 +0100
Subject: [PATCH] libdm: check for empty aux_data in _parse_aux_data_group()

If after extracting stats arguments and group tags nothing remains
of aux_data but '-' set the region->aux_data field to the empty
string to match behaviour for non-grouped regions.
---
 libdm/libdm-stats.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libdm/libdm-stats.c b/libdm/libdm-stats.c
index 12c821f23..e979b341c 100644
--- a/libdm/libdm-stats.c
+++ b/libdm/libdm-stats.c
@@ -692,7 +692,7 @@ static int _parse_aux_data_group(struct dm_stats *dms,
 	}
 
 	/* separate group tag from user aux_data */
-	if (strlen(end))
+	if ((strlen(end) > 1) || strncmp(end, "-", 1))
 		c = dm_strdup(end);
 	else
 		c = dm_strdup("");