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rewind: fix zero-size savestates, and maybe fix a possible 1 byte array overrun

This commit is contained in:
zeromus 2017-04-17 22:42:42 -05:00
parent d7b0043379
commit c4776a0c00
1 changed files with 8 additions and 2 deletions
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10
BizHawk.Client.Common/rewind/Rewinder.cs
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@ -241,15 +241,21 @@ namespace BizHawk.Client.Common
goto CaptureFullState;
}
if(currentState.Length == 0)
{
//handle empty states as a "full" (empty) state
goto CaptureFullState;
}
int index = 0;
int stateLength = Math.Min(currentState.Length, _lastState.Length);
bool inChangeSequence = false;
int changeSequenceStartOffset = 0;
int lastChangeSequenceStartOffset = 0;
if (_deltaBuffer.Length < stateLength)
if (_deltaBuffer.Length < stateLength + 1)
{
_deltaBuffer = new byte[stateLength];
_deltaBuffer = new byte[stateLength + 1];
}
_deltaBuffer[index++] = 0; // Full state = false (i.e. delta)