[lwip-devel] [bug #49631] Zero window and refused data problem

[Joel Cunningham]

Follow-up Comment #5, bug #49631 (project lwip):

If we did the proposed announced window check before the refused_data check,
then it wouldn't matter whether refused_data was non-NULL or not because any
zero window probe would be responded to with an ACK containing RCV.NEXT and
then the data segment dropped.  I was suggesting it as a smaller scope fix
that addresses the standards violation.

I'm fine with removing the refused_data and switching the order, that seems
like the logical ordering that doesn't leave us in this situation where we
generated the ACK but failed to buffer the segment

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