From c38907374aaee1e6867c767ae26a0e9d2f84269a Mon Sep 17 00:00:00 2001
From: Marsman1996 <lqliuyuwei@outlook.com>
Date: Wed, 21 Aug 2024 13:51:43 +0800
Subject: [PATCH] Check the length of timers before access

---
 kernel/aster-nix/src/process/process/timer_manager.rs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/kernel/aster-nix/src/process/process/timer_manager.rs b/kernel/aster-nix/src/process/process/timer_manager.rs
index fc0d0e519..0815a59d4 100644
--- a/kernel/aster-nix/src/process/process/timer_manager.rs
+++ b/kernel/aster-nix/src/process/process/timer_manager.rs
@@ -187,7 +187,12 @@ impl PosixTimerManager {
 
     /// Finds a POSIX timer by the input `timer_id`.
     pub fn find_posix_timer(&self, timer_id: usize) -> Option<Arc<Timer>> {
-        self.posix_timers.lock()[timer_id].clone()
+        let timers = self.posix_timers.lock();
+        if timer_id < timers.len() {
+            timers[timer_id].clone()
+        } else {
+            None
+        }
     }
 
     /// Removes the POSIX timer with the ID `timer_id`.