diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Object/WasmObjectFile.cpp | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/lib/Object/WasmObjectFile.cpp b/lib/Object/WasmObjectFile.cpp index 15a78df5402..86ce9c2209c 100644 --- a/lib/Object/WasmObjectFile.cpp +++ b/lib/Object/WasmObjectFile.cpp @@ -178,14 +178,16 @@ static wasm::WasmTable readTable(const uint8_t *&Ptr) { } static Error readSection(WasmSection &Section, const uint8_t *&Ptr, - const uint8_t *Start) { - // TODO(sbc): Avoid reading past EOF in the case of malformed files. + const uint8_t *Start, const uint8_t *Eof) { Section.Offset = Ptr - Start; Section.Type = readVaruint7(Ptr); uint32_t Size = readVaruint32(Ptr); if (Size == 0) return make_error<StringError>("Zero length section", object_error::parse_failed); + if (Ptr + Size > Eof) + return make_error<StringError>("Section too large", + object_error::parse_failed); Section.Content = ArrayRef<uint8_t>(Ptr, Size); Ptr += Size; return Error::success(); @@ -221,7 +223,7 @@ WasmObjectFile::WasmObjectFile(MemoryBufferRef Buffer, Error &Err) WasmSection Sec; while (Ptr < Eof) { - if ((Err = readSection(Sec, Ptr, getPtr(0)))) + if ((Err = readSection(Sec, Ptr, getPtr(0), Eof))) return; if ((Err = parseSection(Sec))) return; |