DiscIO: Fix decompressing writing too much sometimes

This issue cannot happen with good dumps due to their size,
but it can happen with trimmed dumps.

1 files changed, 1 insertions, 1 deletions

diff --git a/Source/Core/DiscIO/CompressedBlob.cpp b/Source/Core/DiscIO/CompressedBlob.cpp
index 1fe8c4c921..f1ab226025 100644
--- a/Source/Core/DiscIO/CompressedBlob.cpp
+++ b/Source/Core/DiscIO/CompressedBlob.cpp
@@ -371,7 +371,7 @@ bool DecompressBlobToFile(const std::string& infile_path, const std::string& out
   const CompressedBlobHeader& header = reader->GetHeader();
   static const size_t BUFFER_BLOCKS = 32;
   size_t buffer_size = header.block_size * BUFFER_BLOCKS;
-  size_t last_buffer_size = header.block_size * (header.num_blocks % BUFFER_BLOCKS);
+  size_t last_buffer_size = header.data_size % buffer_size;
   if (last_buffer_size == 0)
     last_buffer_size = buffer_size;
   std::vector<u8> buffer(buffer_size);