From: David Teigland <teigland@redhat.com>

Return sense if dm_split_args is called with a NULL input parameter.

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 drivers/md/dm-table.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff -puN drivers/md/dm-table.c~dm-table-split_args-handle-no-input drivers/md/dm-table.c
--- a/drivers/md/dm-table.c~dm-table-split_args-handle-no-input
+++ a/drivers/md/dm-table.c
@@ -590,6 +590,12 @@ int dm_split_args(int *argc, char ***arg
 	unsigned array_size = 0;
 
 	*argc = 0;
+
+	if (!input) {
+		*argvp = NULL;
+		return 0;
+	}
+
 	argv = realloc_argv(&array_size, argv);
 	if (!argv)
 		return -ENOMEM;
_