On Mon, 19 Nov 2007 10:30:45 +0100
Petr Tesarik <[email protected]> wrote:
> Hi,
>
> while merging commits f01d5e14e764b14b6bf5512678523d009254b209 and
> 638b250766272fcaaa0f7ed2776f58f4ac701914 into SLES10, I've noticed
> that there's apparently a bug. The code currently looks like this:
>
> pdu_length = 4; /* enough to get RFC1001 header */
> incomplete_rcv:
> length =
> kernel_recvmsg(csocket, &smb_msg,
> &iov, 1, pdu_length, 0 /* BB other
> flags? */);
>
> /* ... some irrelevant code left out ... */
>
> } else if (length < 4) { /* <----- HERE IS THE
> PROBLEM cFYI(1, ("less than four bytes received (%d bytes)",
> length));
> pdu_length -= length;
> msleep(1);
> goto incomplete_rcv;
> }
>
> I think we should be checking for length < pdu_length, not for length
> < 4, because if we read 2 bytes in the first run and 2 bytes in the
> second un, CIFS will still treat the second run as incomplete (and
> possibly run in an infinite loop). Am I missing something obvious?
>
I think you're right that the logic there is wrong, but I don't see an
infinite loop happening. It looks like in this situation, that the next
call to kernel_recvmsg will be called a size of 0, which should
eventually return 0. It'll then fall into the previous condition -- do
a reconnect and then go around the big loop again.
A patch to clean that up would probably be a good thing. We likely
don't need to do a reconnect here.
--
Jeff Layton <[email protected]>
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