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Fix crash in BasicAttackBehavior (#862)

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* Add failArmor server side

Address out of bounds reading in behavior

Address the basicAttackBehavior reading out of bounds memory and reading bits that didnt exist, which occasionally caused crashes and also caused the behavior to do undefined behavior due to the bad reads.

Tested that attacking a wall anywhere with a projectile now does not crash the game.  Tested with logs that the behavior correctly returned when there were no allocated bits or returned when other states were met.

Add back logs and add fail handle

Remove comment block

Revert "Add back logs and add fail handle"

This reverts commit db19be0906fc8bf35bf89037e2bfba39f5ef9c0c.

Split out checks

* Remove case 2

* Update SkillComponent.cpp
This commit is contained in:
David Markowitz 2022-12-15 22:10:58 -08:00 committed by GitHub
parent b7341c8106
commit 213c3c37b0
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 65 additions and 63 deletions
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85
dGame/dBehaviors/BasicAttackBehavior.cpp
View File

@ -14,43 +14,65 @@ void BasicAttackBehavior::Handle(BehaviorContext* context, RakNet::BitStream* bi
auto* destroyableComponent = entity->GetComponent<DestroyableComponent>();
if (destroyableComponent != nullptr) {
PlayFx(u"onhit", entity->GetObjectID());
destroyableComponent->Damage(this->m_maxDamage, context->originator, context->skillID);
destroyableComponent->Damage(this->m_MaxDamage, context->originator, context->skillID);
}
this->m_onSuccess->Handle(context, bitStream, branch);
this->m_OnSuccess->Handle(context, bitStream, branch);
return;
}
bitStream->AlignReadToByteBoundary();
uint16_t allocatedBits;
bitStream->Read(allocatedBits);
uint16_t allocatedBits{};
if (!bitStream->Read(allocatedBits) || allocatedBits == 0) {
Game::logger->LogDebug("BasicAttackBehavior", "No allocated bits");
return;
}
Game::logger->LogDebug("BasicAttackBehavior", "Number of allocated bits %i", allocatedBits);
const auto baseAddress = bitStream->GetReadOffset();
if (bitStream->ReadBit()) { // Blocked
bool isBlocked{};
bool isImmune{};
bool isSuccess{};
if (!bitStream->Read(isBlocked)) {
Game::logger->LogDebug("BasicAttackBehavior", "Unable to read isBlocked");
return;
}
if (bitStream->ReadBit()) { // Immune
if (isBlocked) return;
if (!bitStream->Read(isImmune)) {
Game::logger->LogDebug("BasicAttackBehavior", "Unable to read isImmune");
return;
}
if (bitStream->ReadBit()) { // Success
uint32_t unknown;
bitStream->Read(unknown);
if (isImmune) return;
uint32_t damageDealt;
bitStream->Read(damageDealt);
if (bitStream->Read(isSuccess) && isSuccess) { // Success
uint32_t unknown{};
if (!bitStream->Read(unknown)) {
Game::logger->LogDebug("BasicAttackBehavior", "Unable to read unknown");
return;
}
uint32_t damageDealt{};
if (!bitStream->Read(damageDealt)) {
Game::logger->LogDebug("BasicAttackBehavior", "Unable to read damageDealt");
return;
}
// A value that's too large may be a cheating attempt, so we set it to MIN too
if (damageDealt > this->m_maxDamage || damageDealt < this->m_minDamage) {
damageDealt = this->m_minDamage;
if (damageDealt > this->m_MaxDamage || damageDealt < this->m_MinDamage) {
damageDealt = this->m_MinDamage;
}
auto* entity = EntityManager::Instance()->GetEntity(branch.target);
bool died;
bitStream->Read(died);
bool died{};
if (!bitStream->Read(died)) {
Game::logger->LogDebug("BasicAttackBehavior", "Unable to read died");
return;
}
if (entity != nullptr) {
auto* destroyableComponent = entity->GetComponent<DestroyableComponent>();
@ -61,15 +83,18 @@ void BasicAttackBehavior::Handle(BehaviorContext* context, RakNet::BitStream* bi
}
}
uint8_t successState;
bitStream->Read(successState);
uint8_t successState{};
if (!bitStream->Read(successState)) {
Game::logger->LogDebug("BasicAttackBehavior", "Unable to read success state");
return;
}
switch (successState) {
case 1:
this->m_onSuccess->Handle(context, bitStream, branch);
this->m_OnSuccess->Handle(context, bitStream, branch);
break;
default:
Game::logger->Log("BasicAttackBehavior", "Unknown success state (%i)!", successState);
Game::logger->LogDebug("BasicAttackBehavior", "Unknown success state (%i)!", successState);
break;
}
@ -79,7 +104,7 @@ void BasicAttackBehavior::Handle(BehaviorContext* context, RakNet::BitStream* bi
void BasicAttackBehavior::Calculate(BehaviorContext* context, RakNet::BitStream* bitStream, BehaviorBranchContext branch) {
auto* self = EntityManager::Instance()->GetEntity(context->originator);
if (self == nullptr) {
Game::logger->Log("BasicAttackBehavior", "Invalid self entity (%llu)!", context->originator);
Game::logger->LogDebug("BasicAttackBehavior", "Invalid self entity (%llu)!", context->originator);
return;
}
@ -99,7 +124,7 @@ void BasicAttackBehavior::Calculate(BehaviorContext* context, RakNet::BitStream*
uint32_t unknown3 = 0;
bitStream->Write(unknown3);
auto damage = this->m_minDamage;
auto damage = this->m_MinDamage;
auto* entity = EntityManager::Instance()->GetEntity(branch.target);
if (entity == nullptr) {
@ -124,10 +149,10 @@ void BasicAttackBehavior::Calculate(BehaviorContext* context, RakNet::BitStream*
switch (successState) {
case 1:
this->m_onSuccess->Calculate(context, bitStream, branch);
this->m_OnSuccess->Calculate(context, bitStream, branch);
break;
default:
Game::logger->Log("BasicAttackBehavior", "Unknown success state (%i)!", successState);
Game::logger->LogDebug("BasicAttackBehavior", "Unknown success state (%i)!", successState);
break;
}
@ -140,11 +165,13 @@ void BasicAttackBehavior::Calculate(BehaviorContext* context, RakNet::BitStream*
}
void BasicAttackBehavior::Load() {
this->m_minDamage = GetInt("min damage");
if (this->m_minDamage == 0) this->m_minDamage = 1;
this->m_MinDamage = GetInt("min damage");
if (this->m_MinDamage == 0) this->m_MinDamage = 1;
this->m_maxDamage = GetInt("max damage");
if (this->m_maxDamage == 0) this->m_maxDamage = 1;
this->m_MaxDamage = GetInt("max damage");
if (this->m_MaxDamage == 0) this->m_MaxDamage = 1;
this->m_onSuccess = GetAction("on_success");
this->m_OnSuccess = GetAction("on_success");
this->m_OnFailArmor = GetAction("on_fail_armor");
}

14
dGame/dBehaviors/BasicAttackBehavior.h
View File

@ -4,12 +4,6 @@
class BasicAttackBehavior final : public Behavior
{
public:
uint32_t m_minDamage;
uint32_t m_maxDamage;
Behavior* m_onSuccess;
explicit BasicAttackBehavior(const uint32_t behaviorId) : Behavior(behaviorId) {
}
@ -18,4 +12,12 @@ public:
void Calculate(BehaviorContext* context, RakNet::BitStream* bitStream, BehaviorBranchContext branch) override;
void Load() override;
private:
uint32_t m_MinDamage;
uint32_t m_MaxDamage;
Behavior* m_OnSuccess;
Behavior* m_OnFailArmor;
};

29
dGame/dComponents/SkillComponent.cpp
View File

@ -319,34 +319,7 @@ void SkillComponent::CalculateUpdate(const float deltaTime) {
const auto distance = Vector3::DistanceSquared(targetPosition, closestPoint);
if (distance > 3 * 3) {
/*
if (entry.TrackTarget && distance <= entry.TrackRadius)
{
const auto rotation = NiQuaternion::LookAtUnlocked(position, targetPosition);
const auto speed = entry.Velocity.Length();
const auto homingTarget = rotation.GetForwardVector() * speed;
Vector3 homing;
// Move towards
const auto difference = homingTarget - entry.Velocity;
const auto mag = difference.Length();
if (mag <= speed || mag == 0)
{
homing = homingTarget;
}
else
{
entry.Velocity + homingTarget / mag * speed;
}
entry.Velocity = homing;
}
*/
// TODO There is supposed to be an implementation for homing projectiles here
continue;
}