From e40794e672668ea20f68b8c892a22758a3392f1c Mon Sep 17 00:00:00 2001
From: sBubshait <s.bobshit@gmail.com>
Date: Fri, 8 Nov 2024 16:48:19 +0000
Subject: [PATCH] Fix Bug in fd_get_file: In case fd not found, then returns
 NULL, w/ E

---
 src/userprog/syscall.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/userprog/syscall.c b/src/userprog/syscall.c
index 4bd8732..96c099d 100644
--- a/src/userprog/syscall.c
+++ b/src/userprog/syscall.c
@@ -340,6 +340,9 @@ fd_get_file (int fd)
   struct hash_elem *e
     = hash_find (&thread_current ()->open_files, &fake_file_info.elem);
 
+  if (e == NULL)
+      return NULL;
+
   return hash_entry (e, struct open_file, elem);
 }