diff --git a/mm/swapfile.c b/mm/swapfile.c
index f64b54d647a9..64c93f1869f2 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -3661,6 +3661,10 @@ static int __swap_duplicate(swp_entry_t entry, unsigned char usage, int nr)
 	int err, i;
 
 	si = swp_swap_info(entry);
+	if (WARN_ON_ONCE(!si)) {
+		pr_err("%s%08lx\n", Bad_file, entry.val);
+		return -EINVAL;
+	}
 
 	offset = swp_offset(entry);
 	VM_WARN_ON(nr > SWAPFILE_CLUSTER - offset % SWAPFILE_CLUSTER);