[Crash] Pointer validation in mob iteration loops (#2490)

zone/attack.cpp

@@ -1621,6 +1621,10 @@ bool Client::Attack(Mob* other, int Hand, bool bRiposte, bool IsStrikethrough, b
 			auto& mob_list = entity_list.GetCloseMobList(other);
 			for (auto& e : mob_list) {
 				auto mob = e.second;
+				if (!mob) {
+					continue;
+				}
+
 				if (mob->IsNPC() && mob->CastToNPC()->IsGuard()) {
 					float distance = Distance(other->CastToClient()->m_Position, mob->GetPosition());
 					if ((mob->CheckLosFN(other) || mob->CheckLosFN(this)) && distance <= 70) {
@@ -2135,6 +2139,9 @@ bool NPC::Attack(Mob* other, int Hand, bool bRiposte, bool IsStrikethrough, bool
 			auto& mob_list = entity_list.GetCloseMobList(other);
 			for (auto& e : mob_list) {
 				auto mob = e.second;
+				if (!mob) {
+					continue;
+				}
 				if (mob->IsNPC() && mob->CastToNPC()->IsGuard()) {
 					float distance = Distance(other->GetPosition(), mob->GetPosition());
 					if ((mob->CheckLosFN(other) || mob->CheckLosFN(this)) && distance <= 70) {

zone/aura.cpp

@@ -77,6 +77,9 @@ void Aura::ProcessOnAllFriendlies(Mob *owner)
 
 	for (auto &e : mob_list) {
 		auto mob = e.second;
+		if (!mob) {
+			continue;
+		}
 		if (mob->IsClient() || mob->IsPetOwnerClient() || mob->IsMerc()) {
 			auto it = casted_on.find(mob->GetID());
 
@@ -187,6 +190,9 @@ void Aura::ProcessOnAllGroupMembers(Mob *owner)
 
 		for (auto &e : mob_list) {
 			auto mob = e.second;
+			if (!mob) {
+				continue;
+			}
 			// step 1: check if we're already managing this NPC's buff
 			auto it  = casted_on.find(mob->GetID());
 			if (it != casted_on.end()) {
@@ -414,6 +420,9 @@ void Aura::ProcessOnGroupMembersPets(Mob *owner)
 
 		for (auto &e : mob_list) {
 			auto mob = e.second;
+			if (!mob) {
+				continue;
+			}
 			// step 1: check if we're already managing this NPC's buff
 			auto it  = casted_on.find(mob->GetID());
 			if (it != casted_on.end()) {
@@ -572,6 +581,10 @@ void Aura::ProcessTotem(Mob *owner)
 
 	for (auto &e : mob_list) {
 		auto mob = e.second;
+		if (!mob) {
+			continue;
+		}
+
 		if (mob == this) {
 			continue;
 		}
@@ -624,6 +637,10 @@ void Aura::ProcessEnterTrap(Mob *owner)
 
 	for (auto &e : mob_list) {
 		auto mob = e.second;
+		if (!mob) {
+			continue;
+		}
+
 		if (mob == this) {
 			continue;
 		}
@@ -642,6 +659,10 @@ void Aura::ProcessExitTrap(Mob *owner)
 
 	for (auto &e : mob_list) {
 		auto mob = e.second;
+		if (!mob) {
+			continue;
+		}
+
 		if (mob == this) {
 			continue;
 		}
@@ -669,6 +690,10 @@ void Aura::ProcessSpawns()
 {
 	const auto &clients = entity_list.GetCloseMobList(this, distance);
 	for (auto  &e : clients) {
+		if (!e.second) {
+			continue;
+		}
+
 		if (!e.second->IsClient()) {
 			continue;
 		}

zone/effects.cpp

@@ -914,6 +914,9 @@ void EntityList::AETaunt(Client *taunter, float range, int32 bonus_hate)
 
 	for (auto &it : entity_list.GetCloseMobList(taunter, range)) {
 		Mob *them = it.second;
+		if (!them) {
+			continue;
+		}
 
 		if (!them->IsNPC()) {
 			continue;
@@ -999,7 +1002,6 @@ void EntityList::AESpell(
 
 	for (auto &it : entity_list.GetCloseMobList(caster_mob, distance)) {
 		current_mob = it.second;
-
 		if (!current_mob) {
 			continue;
 		}
@@ -1150,6 +1152,9 @@ void EntityList::MassGroupBuff(
 
 	for (auto &it : entity_list.GetCloseMobList(caster, distance)) {
 		current_mob = it.second;
+		if (!current_mob) {
+			continue;
+		}
 
 		/**
 		 * Skip center
@@ -1216,6 +1221,9 @@ void EntityList::AEAttack(
 
 	for (auto &it : entity_list.GetCloseMobList(attacker, distance)) {
 		current_mob = it.second;
+		if (!current_mob) {
+			continue;
+		}
 
 		if (current_mob->IsNPC()
 			&& current_mob != attacker //this is not needed unless NPCs can use this

zone/entity.cpp

@@ -1724,6 +1724,9 @@ void EntityList::QueueCloseClients(
 
 	for (auto &e : GetCloseMobList(sender, distance)) {
 		Mob *mob = e.second;
+		if (!mob) {
+			continue;
+		}
 
 		if (!mob->IsClient()) {
 			continue;
@@ -4416,6 +4419,9 @@ void EntityList::QuestJournalledSayClose(
 	if (RuleB(Chat, QuestDialogueUsesDialogueWindow)) {
 		for (auto &e : GetCloseMobList(sender, (dist * dist))) {
 			Mob *mob = e.second;
+			if (!mob) {
+				continue;
+			}
 
 			if (!mob->IsClient()) {
 				continue;
@@ -5551,7 +5557,6 @@ std::vector<Mob*> EntityList::GetTargetsForVirusEffect(Mob *spreader, Mob *origi
 	bool               is_detrimental_spell = IsDetrimentalSpell(spell_id);
 	for (auto          &it : entity_list.GetCloseMobList(spreader, range)) {
 		Mob *mob = it.second;
-
 		if (!mob) {
 			continue;
 		}

zone/mob.cpp

@@ -3866,6 +3866,9 @@ void Mob::Say(const char *format, ...)
 	if (RuleB(Chat, QuestDialogueUsesDialogueWindow)) {
 		for (auto &e : entity_list.GetCloseMobList(talker, (distance * distance))) {
 			Mob *mob = e.second;
+			if (!mob) {
+				continue;
+			}
 
 			if (!mob->IsClient()) {
 				continue;

zone/npc.cpp

@@ -3463,6 +3463,9 @@ bool NPC::AICheckCloseBeneficialSpells(
 	 */
 	for (auto & close_mob : entity_list.GetCloseMobList(caster, cast_range)) {
 		Mob *mob = close_mob.second;
+		if (!mob) {
+			continue;
+		}
 
 		if (mob->IsClient()) {
 			continue;
@@ -3539,6 +3542,10 @@ void NPC::AIYellForHelp(Mob *sender, Mob *attacker)
 
 	for (auto &close_mob : entity_list.GetCloseMobList(sender)) {
 		Mob   *mob     = close_mob.second;
+		if (!mob) {
+			continue;
+		}
+
 		float distance = DistanceSquared(m_Position, mob->GetPosition());
 
 		if (mob->IsClient()) {

zone/spells.cpp

@@ -2284,6 +2284,9 @@ bool Mob::SpellFinished(uint16 spell_id, Mob *spell_target, CastingSlot slot, in
 			auto& mob_list = entity_list.GetCloseMobList(spell_target);
 			for (auto& e : mob_list) {
 				auto mob = e.second;
+				if (!mob) {
+					continue;
+				}
 				if (mob->IsNPC() && mob->CastToNPC()->IsGuard()) {
 					float distance = Distance(spell_target->GetPosition(), mob->GetPosition());
 					if ((mob->CheckLosFN(spell_target) || mob->CheckLosFN(this)) && distance <= 70) {