diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 85b4433c31dfcee4a63fbcfa67496f31db696c31..29a61f13282f40e92f7daa2e5fbf8df705c9c1fd 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;
 	}