Re: [Qemu-devel] [PATCH v2] qemu-nbd: only send a limited number of errno codes on the wire

[Paolo Bonzini <pbonzini@redhat.com>]

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On 08/05/2015 15:02, Eric Blake wrote:
>>>>> Do we also want to handle "case 0: return 0;" on either
>>>>> conversion, or even "case 0: abort();" to ensure that
>>>>> callers are using these helpers correctly?
>>> 
>>> Yes, it's much better that way.
> Thinking about it a bit more: abort() is fine on the sending side,
> to ensure we aren't putting garbage on the wire; but abort() on
> the receiving side is a bit risky (we should be handling a
> corrupted incoming stream gracefully - a malicious sender should
> not be able to crash us).  Of course, once we've detected a
> corrupted incoming stream, we can't do much for the block device
> the stream was supposed to represent (perhaps treat it as EIO and
> declare the device dead), but that's still better than aborting.

I've included "case 0: return 0;" in the pull request.

Paolo
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