Issue 4503: Added check into BufferedChannel's read to avoid endless loop #4506
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Fix #4503
Motivation
As discussed in the referred issue, this PR aims to avoid the endless loop which will happen if the dest ByteBuf passed to the BufferedChannel's read has less remaining writable bytes than the amount of bytes required to read (read's "length" parameter)
Changes
Now, BufferedChannel.read() throws an exception if dest. buf. writableBytes is less than length