[Kde-games-devel] Review Request 126919: Fix crash when placing bonuses in the arena

[Julian Helfferich]

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https://git.reviewboard.kde.org/r/126919/
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(Updated Jan. 30, 2016, 4:38 a.m.)


Status
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This change has been marked as submitted.


Review request for KDE Games.


Changes
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Submitted with commit 3599732222665d283cad14ac90fc2dbcfe712b1f by Julian Helfferich to branch master.


Repository: granatier


Description
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The crash takes place in game.cpp - Game::createBonus(). The total amount of blocks is nFullSize. To place the bonuses, the game iterates over 4 quarters, the first three containing nFullSize/4 blocks and the last containing the remaining blocks. Thus, nQuarterSize can be larger for the last quarter than for the previous three. Now, when a bonus is assigned to a block, the index of the block is calculated as

nIndex = nQuarter * nQuarterSize + i

where i iterates from zero to nQuarterSize. The idea is that nQuarter * nQuarterSize is the number of blocks of the previous quarters. However, since nQuarterSize can be larger for the last quarter, this can lead to an index out of bounds when a bonus is to be placed in one of the last blocks. The fixed version is

nIndex = nQuarter * (nFullSize/4) + i

where nFullSize/4 is the size of the first three quarters.


Diffs
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  src/game.cpp 371fac9 

Diff: https://git.reviewboard.kde.org/r/126919/diff/


Testing
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Started the game a lot of times. Crash did not happen.


Thanks,

Julian Helfferich

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