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[Support] Check zstd decompress result before msan unpoison #117276

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merged 2 commits into from
Nov 25, 2024
Merged

[Support] Check zstd decompress result before msan unpoison #117276

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eb4cb92
check res before unpoison
yingcong-wu Nov 22, 2024
d710ec0
format
yingcong-wu Nov 22, 2024
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7 changes: 4 additions & 3 deletions llvm/lib/Support/Compression.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -206,12 +206,13 @@ Error zstd::decompress(ArrayRef<uint8_t> Input, uint8_t *Output,
const size_t Res = ::ZSTD_decompress(
Output, UncompressedSize, (const uint8_t *)Input.data(), Input.size());
UncompressedSize = Res;
if (ZSTD_isError(Res))
return make_error<StringError>(ZSTD_getErrorName(Res),
inconvertibleErrorCode());
// Tell MemorySanitizer that zstd output buffer is fully initialized.
// This avoids a false report when running LLVM with uninstrumented ZLib.
__msan_unpoison(Output, UncompressedSize);
return ZSTD_isError(Res) ? make_error<StringError>(ZSTD_getErrorName(Res),
inconvertibleErrorCode())
: Error::success();
return Error::success();
}

Error zstd::decompress(ArrayRef<uint8_t> Input,
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