Polling non-blocking socket for POLLOUT after receiving RST results in null pointer dereference

[rkojedzinszky]

Please run the attached script in a esp8266 board with modifying the target address/port to a reachable host and closed port.

poll.py

[robert-hh]

Just fo rconvenience: this is the script:

import usocket
import uselect
import time

poller = uselect.poll()

s = usocket.socket()

s.setblocking(False)

ai = usocket.getaddrinfo('10.0.0.10', 5001)[0][-1]
try:
    s.connect(ai)
except Exception as e:
    print('{!r}'.format(e))

time.sleep_ms(100)

poller.register(s, uselect.POLLOUT)
print (poller.poll(1000))
poller.unregister(s)

s.close()

poller.register(s, uselect.POLLIN)
print (poller.poll(1000))

[dpgeorge]

This is fixed by 318f874