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fix DeltaSerializer validation checks and add one more

This commit is contained in:
CasualPokePlayer 2023-04-02 02:19:52 -07:00
parent 6f7f94a06e
commit 86b33bd3ce
1 changed files with 7 additions and 2 deletions
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9
src/BizHawk.Common/DeltaSerializer.cs
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@ -126,7 +126,7 @@ namespace BizHawk.Common
{
header = -header;
if (header < dataEnd - dataPos || header < deltaEnd - deltaPos)
if (dataEnd - dataPos < header || deltaEnd - deltaPos < header)
{
throw new InvalidOperationException("Corrupt delta header!");
}
@ -140,7 +140,7 @@ namespace BizHawk.Common
}
else // sameness block
{
if (header < dataEnd - dataPos)
if (dataEnd - dataPos < header)
{
throw new InvalidOperationException("Corrupt delta header!");
}
@ -150,6 +150,11 @@ namespace BizHawk.Common
dataPos += header;
}
if (dataPos != dataEnd)
{
throw new InvalidOperationException("Did not reach end of data after applying delta!");
}
}
}
}