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Avoid reading out of bounds 

as per https://github.com/cuberite/cuberite/pull/2630#discussion_r44377411
This commit is contained in:
Gargaj 2015-11-10 14:17:56 +01:00
parent 951569faaa
commit 5e840cf86f
1 changed files with 14 additions and 4 deletions
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18
src/Entities/Player.cpp
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@ -462,7 +462,17 @@ void cPlayer::SetTouchGround(bool a_bTouchGround)
static const auto HalfWidth = GetWidth() / 2;
static const auto EPS = 0.0001;
BLOCKTYPE BlockAtFoot = GetWorld()->GetBlock(POS_TOINT);
/* Since swimming is decided in a tick and is asynchronous to this, we have to check for dampeners ourselves.
The behaviour as of 1.8.8 is the following:
- Landing in water alleviates all fall damage
- Passing through any liquid (water + lava) and cobwebs "slows" the player down,
i.e. resets the fall distance to that block, but only after checking for fall damage
(this means that plummeting into lava will still kill the player via fall damage, although cobwebs
will slow players down enough to have multiple updates that keep them alive)
With this in mind, we first check the block at the player's feet, and decide which behaviour we want to go with.
*/
BLOCKTYPE BlockAtFoot = (cChunkDef::IsValidHeight(GetPosY())) ? GetWorld()->GetBlock(POS_TOINT) : E_BLOCK_AIR;
bool IsFootInWater = IsBlockWater(BlockAtFoot);
bool IsFootInLiquid = IsFootInWater || IsBlockLava(BlockAtFoot) || (BlockAtFoot == E_BLOCK_COBWEB); // okay so cobweb is not _technically_ a liquid...
@ -470,7 +480,7 @@ void cPlayer::SetTouchGround(bool a_bTouchGround)
!IsFlying() &&
(
(
((GetPosY() >= 1) && (GetPosY() <= 255) && ((GetPosY() - POSY_TOINT) <= EPS)) &&
(cChunkDef::IsValidHeight(GetPosY()) && ((GetPosY() - POSY_TOINT) <= EPS)) &&
(
cBlockInfo::IsSolid(GetWorld()->GetBlock((GetPosition() + Vector3d(0, -1, 0)).Floor())) ||
cBlockInfo::IsSolid(GetWorld()->GetBlock((GetPosition() + Vector3d(HalfWidth, -1, 0)).Floor())) ||
@ -480,7 +490,7 @@ void cPlayer::SetTouchGround(bool a_bTouchGround)
)
) ||
(
(((GetPosY() >= 1) && (GetPosY() <= 255) && GetPosY() >= POSY_TOINT) && ((GetPosY() - (POSY_TOINT + 0.5)) <= EPS)) &&
(cChunkDef::IsValidHeight(GetPosY()) && (GetPosY() >= POSY_TOINT) && ((GetPosY() - (POSY_TOINT + 0.5)) <= EPS)) &&
(
cBlockSlabHandler::IsAnySlabType(GetWorld()->GetBlock((GetPosition() + Vector3d(0, 0, 0)).Floor())) ||
cBlockSlabHandler::IsAnySlabType(GetWorld()->GetBlock((GetPosition() + Vector3d(HalfWidth, 0, 0)).Floor())) ||
@ -490,7 +500,7 @@ void cPlayer::SetTouchGround(bool a_bTouchGround)
)
) ||
(
((GetPosY() >= 1) && (GetPosY() <= 255) && fmod(GetPosY(), 0.125) <= EPS) &&
(cChunkDef::IsValidHeight(GetPosY()) && (fmod(GetPosY(), 0.125) <= EPS)) &&
(
(GetWorld()->GetBlock((GetPosition() + Vector3d(0, 0, 0)).Floor()) == E_BLOCK_SNOW) ||
(GetWorld()->GetBlock((GetPosition() + Vector3d(HalfWidth, 0, 0)).Floor()) == E_BLOCK_SNOW) ||