StripedBlockUtil.cpp: Potential integer overflow

[stasos24]

Since int64_t StripedBlockUtil::getInternalBlockLengt returns int64_t

libhdfs3/src/client/StripedBlockUtil.cpp

Lines 117 to 134 in d0ae7d2

	int64_t StripedBlockUtil::getInternalBlockLength(int64_t dataSize, int32_t cellSize,
	int32_t numDataBlocks, int32_t idxInBlockGroup) {
	if (dataSize < 0 || cellSize <= 0 || numDataBlocks <= 0 || idxInBlockGroup < 0) {
	THROW(InvalidParameter, "invalid parameter.");
	}
	// Size of each stripe (only counting data blocks)
	int32_t stripeSize = cellSize * numDataBlocks;
	// If block group ends at stripe boundary, each internal block has an equal
	// share of the group
	int32_t lastStripeDataLen = static_cast<int32_t>(dataSize % stripeSize);
	if (lastStripeDataLen == 0) {
	return dataSize / numDataBlocks;
	}
	int32_t numStripes = static_cast<int32_t>((dataSize - 1) / stripeSize + 1);
	return (numStripes - 1) * cellSize
	+ lastCellSize(lastStripeDataLen, cellSize, numDataBlocks, idxInBlockGroup);
	}

and only dataSize has int64_t

there could be integer overflow at:

libhdfs3/src/client/StripedBlockUtil.cpp

Lines 132 to 134 in d0ae7d2

	return (numStripes - 1) * cellSize
	+ lastCellSize(lastStripeDataLen, cellSize, numDataBlocks, idxInBlockGroup);
	}

Possible fix:
cast one of member of adddition to int64_t