diff --git a/fs/open.c b/fs/open.c
index 97932af49071..84e5dcc31c0e 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -1296,6 +1296,8 @@ SYSCALL_DEFINE4(openat2, int, dfd, const char __user *, filename,
 
 	if (unlikely(usize < OPEN_HOW_SIZE_VER0))
 		return -EINVAL;
+	if (unlikely(usize > PAGE_SIZE))
+		return -E2BIG;
 
 	err = copy_struct_from_user(&tmp, sizeof(tmp), how, usize);
 	if (err)