Re: [PATCH] tipc: fix shutdown() of connection oriented socket

[David Miller <davem@davemloft.net>]

From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Date: Sat,  5 Sep 2020 15:14:47 +0900

> I confirmed that the problem fixed by commit 2a63866c8b51a3f7 ("tipc: fix
> shutdown() of connectionless socket") also applies to stream socket.
> 
> ----------
> #include <sys/socket.h>
> #include <unistd.h>
> #include <sys/wait.h>
> 
> int main(int argc, char *argv[])
> {
>         int fds[2] = { -1, -1 };
>         socketpair(PF_TIPC, SOCK_STREAM /* or SOCK_DGRAM */, 0, fds);
>         if (fork() == 0)
>                 _exit(read(fds[0], NULL, 1));
>         shutdown(fds[0], SHUT_RDWR); /* This must make read() return. */
>         wait(NULL); /* To be woken up by _exit(). */
>         return 0;
> }
> ----------
> 
> Since shutdown(SHUT_RDWR) should affect all processes sharing that socket,
> unconditionally setting sk->sk_shutdown to SHUTDOWN_MASK will be the right
> behavior.
> 
> Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>

Applied and queued up for -stable, thank you.