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Differential D31878

sctp: Fix lock recursion in sctp_swap_inpcb_for_listen()
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Authored by markj on Sep 8 2021, 3:06 AM.
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transport
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rG6e3af6321ba4: sctp: Fix lock recursion in sctp_swap_inpcb_for_listen()
Summary

After commit bd4a39cc93d9 we now hold the global inp info lock across
the call to sctp_swap_inpcb_for_listen(), which attempts to acquire it
again. Since sctp_swap_inpcb_for_listen()'s sole caller is
sctp_listen(), we can simply change it to not try to acquire the lock.

Fixes: bd4a39cc93d9 ("socket: Properly interlock when transitioning to a listening socket")
Reported by: syzkaller

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rS FreeBSD src repository - subversion
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Buildable 41425
Build 38314: arc lint + arc unit

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sys/
netinet/
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sys/netinet/sctp_pcb.c

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