From 280023dfc21a9da39a92db1e648b68d7824197b3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=B6nke=20Ludwig?= <sludwig@rejectedsoftware.com>
Date: Sun, 15 Mar 2020 08:59:17 +0100
Subject: [PATCH] Avoid potential overflow for dynamic task priority.

---
 source/vibe/core/task.d | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/source/vibe/core/task.d b/source/vibe/core/task.d
index c422d8c..1fd1b22 100644
--- a/source/vibe/core/task.d
+++ b/source/vibe/core/task.d
@@ -996,7 +996,7 @@ package struct TaskScheduler {
 
 	private void doYieldAndReschedule(Task task)
 	{
-		auto tf = () @trusted { return task.taskFiber; } ();
+		import std.algorithm.comparison : min;
 
 		// insert according to priority, limited to a priority
 		// factor of 1:10 in case of heavy concurrency
@@ -1006,7 +1006,7 @@ package struct TaskScheduler {
 
 			// increase dynamic priority each time a task gets overtaken to
 			// ensure a fair schedule
-			t.m_dynamicPriority += t.m_staticPriority;
+			t.m_dynamicPriority += min(t.m_staticPriority, uint.max - t.m_dynamicPriority);
 			return false;
 		});