af_unix: Annotate data-races around sk->sk_state in unix_write_space() and poll().

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unix_poll() and unix_dgram_poll() read sk->sk_state locklessly and
calls unix_writable() which also reads sk->sk_state without holding
unix_state_lock().

Let's use READ_ONCE() in unix_poll() and unix_dgram_poll() and pass
it to unix_writable().

While at it, we remove TCP_SYN_SENT check in unix_dgram_poll() as
that state does not exist for AF_UNIX socket since the code was added.

Fixes: 1586a5877d ("af_unix: do not report POLLOUT on listeners")
Fixes: 3c73419c09 ("af_unix: fix 'poll for write'/ connected DGRAM sockets")
Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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Kuniyuki Iwashima 2024-06-04 09:52:30 -07:00 • committed by Paolo Abeni

parent 3a0f38eb28

commit eb0718fb3e

1 changed files with 12 additions and 13 deletions

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net/unix/af_unix.c

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