From 553c76ab0f040ef692f05332553c0415aebc696b Mon Sep 17 00:00:00 2001
From: Bananymous <oskari.alaranta@bananymous.com>
Date: Sat, 17 May 2025 12:36:36 +0300
Subject: [PATCH] Kernel: Add locking to inode's epoll list

This was prone to crashing :)
---
 kernel/include/kernel/FS/Inode.h | 1 +
 kernel/kernel/FS/Inode.cpp       | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/kernel/include/kernel/FS/Inode.h b/kernel/include/kernel/FS/Inode.h
index 35edb475..41ac60b8 100644
--- a/kernel/include/kernel/FS/Inode.h
+++ b/kernel/include/kernel/FS/Inode.h
@@ -175,6 +175,7 @@ namespace Kernel
 
 	private:
 		BAN::WeakPtr<SharedFileData> m_shared_region;
+		Mutex m_epoll_mutex;
 		BAN::LinkedList<class Epoll*> m_epolls;
 		friend class FileBackedRegion;
 		friend class OpenFileDescriptorSet;
diff --git a/kernel/kernel/FS/Inode.cpp b/kernel/kernel/FS/Inode.cpp
index 69f795ba..cbc3f026 100644
--- a/kernel/kernel/FS/Inode.cpp
+++ b/kernel/kernel/FS/Inode.cpp
@@ -264,12 +264,14 @@ namespace Kernel
 
 	BAN::ErrorOr<void> Inode::add_epoll(class Epoll* epoll)
 	{
+		LockGuard _(m_epoll_mutex);
 		TRY(m_epolls.push_back(epoll));
 		return {};
 	}
 
 	void Inode::del_epoll(class Epoll* epoll)
 	{
+		LockGuard _(m_epoll_mutex);
 		for (auto it = m_epolls.begin(); it != m_epolls.end(); it++)
 		{
 			if (*it != epoll)
@@ -281,6 +283,7 @@ namespace Kernel
 
 	void Inode::epoll_notify(uint32_t event)
 	{
+		LockGuard _(m_epoll_mutex);
 		for (auto* epoll : m_epolls)
 			epoll->notify(this, event);
 	}