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Merge pull request #13038 from Ferdi265/fix-rvz-clang-ub

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RVZ: Fix undefined behaviour when copying 0 bytes to a null pointer
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Tilka 2024-08-31 00:06:38 +01:00 committed by GitHub
commit 8b7268ddef
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1 changed files with 8 additions and 1 deletions
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9
Source/Core/DiscIO/WIABlob.cpp
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@ -765,7 +765,14 @@ bool WIARVZFileReader<RVZ>::Chunk::Decompress()
const size_t bytes_to_move = m_out.bytes_written - m_out_bytes_used_for_exceptions;
DecompressionBuffer in{std::vector<u8>(bytes_to_move), bytes_to_move};
std::memcpy(in.data.data(), m_out.data.data() + m_out_bytes_used_for_exceptions, bytes_to_move);
// Copying to a null pointer is undefined behaviour, so only copy when we
// actually have data to copy.
if (bytes_to_move > 0)
{
std::memcpy(in.data.data(), m_out.data.data() + m_out_bytes_used_for_exceptions,
bytes_to_move);
}
m_out.bytes_written = m_out_bytes_used_for_exceptions;