[lwip-devel] [bug #23240] recv_udp increases counters for available receives before netbuf is actually posted

[Kieran Mansley]

Follow-up Comment #13, bug #23240 (project lwip):

I've attached a patch which I think might address this in the short term,
using Jifl's suggestion of making the variables signed and adjusting the tests
of those variables to consider anything < 0 as equivalent to zero.  It also
moves the SYS_ARCH_INC and API_EVENT calls to only occur if the
sys_mbox_trypost() call is successful.  I have done this for the recv_udp,
recv_tcp, recv_raw and accept_function functions in api_msg.c as they all
seemed to have the same bit of code.

Before I check this in I would welcome some code review from the other
developers as I want to check that I have correctly understood their proposed
solution.

If anyone can test that this actually works that would be great too.

(file #18330)
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