MINOR: [C++][Parquet] Avoid size overflow in WKBBuffer::ReadCoords#50036
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MINOR: [C++][Parquet] Avoid size overflow in WKBBuffer::ReadCoords#50036jmestwa-coder wants to merge 1 commit into
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WKBBuffer::ReadCoords computes the coordinate-sequence length as n_coords * sizeof(Coord) in size_t, where n_coords is a uint32 read straight from the WKB geometry bytes. On 32-bit targets such as wasm32 that product overflows, so the size_ check passes for a too-small buffer and the following ReadUnchecked loop walks off the end. Widening the multiplication to 64 bits keeps the bound correct everywhere; on 64-bit builds the comparison is unchanged.