From fa61982981ec7766663405cdfec9446e1f1673d4 Mon Sep 17 00:00:00 2001
From: "Daniel K. O. (dkosmari)" <none@none>
Date: Mon, 6 Oct 2025 12:52:38 -0300
Subject: [PATCH] Added safety check for poll(): the nsysnet fd must fit in
 nsysnet_fd_set.

---
 libraries/wutsocket/poll.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libraries/wutsocket/poll.c b/libraries/wutsocket/poll.c
index 27c2672e..20e88739 100644
--- a/libraries/wutsocket/poll.c
+++ b/libraries/wutsocket/poll.c
@@ -32,6 +32,10 @@ poll(struct pollfd *fds,
 
       if ((cnv_fd + 1) > cnv_nfds) {
          cnv_nfds = cnv_fd + 1;
+         if (cnv_nfds > NSYSNET_FD_SETSIZE) {
+            errno = EINVAL;
+            return -1;
+         }
       }
 
       if (fds[i].events & POLLIN) {