diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index c7fe4789c40e..34ab30dd5de9 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -562,7 +562,7 @@ static char **realloc_argv(unsigned *size, char **old_argv)
 		gfp = GFP_NOIO;
 	}
 	argv = kmalloc_array(new_size, sizeof(*argv), gfp);
-	if (argv) {
+	if (argv && old_argv) {
 		memcpy(argv, old_argv, *size * sizeof(*argv));
 		*size = new_size;
 	}