From 7ff509608321d0bd47d7ceebbf68e8732955a29f Mon Sep 17 00:00:00 2001
From: apio <blobs.trading@gmail.com>
Date: Sat, 23 Sep 2023 12:57:03 +0200
Subject: [PATCH] kernel: Avoid page faults when reading from a slave
 pseudoterminal after the master is destroyed

---
 kernel/src/fs/devices/SlavePTY.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/src/fs/devices/SlavePTY.cpp b/kernel/src/fs/devices/SlavePTY.cpp
index 93d32d5e..91fd333a 100644
--- a/kernel/src/fs/devices/SlavePTY.cpp
+++ b/kernel/src/fs/devices/SlavePTY.cpp
@@ -36,6 +36,8 @@ Result<usize> SlavePTY::write(const u8* buf, usize, usize length)
 
 bool SlavePTY::will_block_if_read() const
 {
+    if (!m_master) return false;
+
     if (!m_master->is_canonical()) return m_buffer.is_empty();
     else
         return !m_master->m_lines.size();