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RCE Fix 4

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x86 2026-03-08 14:47:59 +13:00 committed by GitHub
parent 7e3b593053
commit dacde328c9
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GPG key ID: B5690EEEBB952194
1 changed files with 10 additions and 1 deletions
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11
Minecraft.World/BlockRegionUpdatePacket.cpp
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@ -103,6 +103,12 @@ void BlockRegionUpdatePacket::read(DataInputStream *dis) //throws IOException
levelIdx = ( size >> 30 ) & 3; levelIdx = ( size >> 30 ) & 3;
size &= 0x3fffffff; size &= 0x3fffffff;
const int MAX_COMPRESSED_CHUNK_SIZE = 5 * 1024 * 1024;
if(size < 0 || size > MAX_COMPRESSED_CHUNK_SIZE)
{
size = 0;
}
if(size == 0) if(size == 0)
{ {
buffer = byteArray(); buffer = byteArray();
@ -131,7 +137,10 @@ void BlockRegionUpdatePacket::read(DataInputStream *dis) //throws IOException
delete [] compressedBuffer.data; delete [] compressedBuffer.data;
assert(buffer.length == outputSize); if(buffer.length != outputSize)
{
app.DebugPrintf("BlockRegionUpdatePacket: decompressed size mismatch (expected %d, got %d)\n", buffer.length, outputSize);
}
} }
} }