From 5bc15a222694d30f62721eecb3d99b7be006f971 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Fri, 26 Apr 2024 14:25:49 -0400
Subject: kernel: filedesc: Ensure write() fd is correct

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/kern/kern_filedesc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sys/kern/kern_filedesc.c b/sys/kern/kern_filedesc.c
index b95d123..7e65d77 100644
--- a/sys/kern/kern_filedesc.c
+++ b/sys/kern/kern_filedesc.c
@@ -242,6 +242,10 @@ write(int fd, const void *buf, size_t count)
     }
 
     desc = fd_from_fdnum(td, fd);
+    if (desc == NULL) {
+        return -EBADF;
+    }
+
     if (desc->oflag != O_WRONLY && desc->oflag != O_WRONLY) {
         ret = -EACCES;
         goto cleanup;
-- 
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