From f061ffa00ebb6bf748505666c98623794e588df3 Mon Sep 17 00:00:00 2001
From: Monster Iestyn <iestynjealous@ntlworld.com>
Date: Mon, 21 May 2018 20:02:30 +0100
Subject: [PATCH] Stop Each Time trigger linedefs and object-carrying scrollers
 from doing anything with FOFs without FF_EXISTS

---
 src/p_floor.c | 14 ++++++++++++++
 src/p_spec.c  | 27 +++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)

diff --git a/src/p_floor.c b/src/p_floor.c
index 35c743a07..f30637659 100644
--- a/src/p_floor.c
+++ b/src/p_floor.c
@@ -2103,6 +2103,7 @@ void T_EachTimeThinker(levelspecthink_t *eachtime)
 	boolean floortouch = false;
 	fixed_t bottomheight, topheight;
 	msecnode_t *node;
+	ffloor_t *rover;
 
 	for (i = 0; i < MAXPLAYERS; i++)
 	{
@@ -2150,6 +2151,19 @@ void T_EachTimeThinker(levelspecthink_t *eachtime)
 			{
 				targetsec = &sectors[targetsecnum];
 
+				// Find the FOF corresponding to the control linedef
+				for (rover = targetsec->ffloors; rover; rover = rover->next)
+				{
+					if (rover->master == sec->lines[i])
+						break;
+				}
+
+				if (!rover) // This should be impossible, but don't complain if it is the case somehow
+					continue;
+
+				if (!(rover->flags & FF_EXISTS)) // If the FOF does not "exist", we pretend that nobody's there
+					continue;
+
 				for (j = 0; j < MAXPLAYERS; j++)
 				{
 					if (!playeringame[j])
diff --git a/src/p_spec.c b/src/p_spec.c
index c62c3b209..d308a9b3f 100644
--- a/src/p_spec.c
+++ b/src/p_spec.c
@@ -6628,6 +6628,7 @@ void T_Scroll(scroll_t *s)
 		line_t *line;
 		size_t i;
 		INT32 sect;
+		ffloor_t *rover;
 
 		case sc_side: // scroll wall texture
 			side = sides + s->affectee;
@@ -6669,6 +6670,19 @@ void T_Scroll(scroll_t *s)
 					sector_t *psec;
 					psec = sectors + sect;
 
+					// Find the FOF corresponding to the control linedef
+					for (rover = psec->ffloors; rover; rover = rover->next)
+					{
+						if (rover->master == sec->lines[i])
+							break;
+					}
+
+					if (!rover) // This should be impossible, but don't complain if it is the case somehow
+						continue;
+
+					if (!(rover->flags & FF_EXISTS)) // If the FOF does not "exist", we pretend that nobody's there
+						continue;
+
 					for (node = psec->touching_thinglist; node; node = node->m_thinglist_next)
 					{
 						thing = node->m_thing;
@@ -6732,6 +6746,19 @@ void T_Scroll(scroll_t *s)
 					sector_t *psec;
 					psec = sectors + sect;
 
+					// Find the FOF corresponding to the control linedef
+					for (rover = psec->ffloors; rover; rover = rover->next)
+					{
+						if (rover->master == sec->lines[i])
+							break;
+					}
+
+					if (!rover) // This should be impossible, but don't complain if it is the case somehow
+						continue;
+
+					if (!(rover->flags & FF_EXISTS)) // If the FOF does not "exist", we pretend that nobody's there
+						continue;
+
 					for (node = psec->touching_thinglist; node; node = node->m_thinglist_next)
 					{
 						thing = node->m_thing;