[patch v2 1/1] staging: speakup: safely close tty

From	Okash Khawaja <okash.khawaja@gmail.com>
Newsgroups	linux.kernel
Subject	[patch v2 1/1] staging: speakup: safely close tty
Date	2017-07-16 11:40 +0200
Message-ID	<u3ObT-5lh-17@gated-at.bofh.it> (permalink)
References	<u2uyB-3hF-3@gated-at.bofh.it> <u3ObT-5lh-19@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Speakup opens tty using tty_open_by_driver. When closing, it calls
tty_ldisc_release but doesn't close and remove the tty itself. As a
result, that tty cannot be opened from user space. This patch calls
tty_release_struct which ensures that tty is safely removed and freed
up. It also calls tty_ldisc_release, so speakup doesn't need to call it.

Signed-off-by: Okash Khawaja <okash.khawaja@gmail.com>

---
 drivers/staging/speakup/spk_ttyio.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/staging/speakup/spk_ttyio.c
+++ b/drivers/staging/speakup/spk_ttyio.c
@@ -300,7 +300,7 @@ void spk_ttyio_release(void)
 
 	tty_ldisc_flush(speakup_tty);
 	tty_unlock(speakup_tty);
-	tty_ldisc_release(speakup_tty);
+	tty_release_struct(speakup_tty, speakup_tty->index);
 }
 EXPORT_SYMBOL_GPL(spk_ttyio_release);

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Thread

[patch] staging: speakup: safely close tty Okash Khawaja <okash.khawaja@gmail.com> - 2017-07-07 21:20 +0200
  Re: [patch] staging: speakup: safely close tty Alan Cox <gnomes@lxorguk.ukuu.org.uk> - 2017-07-10 14:00 +0200
    Re: [patch] staging: speakup: safely close tty Okash Khawaja <okash.khawaja@gmail.com> - 2017-07-11 12:40 +0200
      Re: [patch] staging: speakup: safely close tty Alan Cox <gnomes@lxorguk.ukuu.org.uk> - 2017-07-12 20:30 +0200
        Re: [patch] staging: speakup: safely close tty Okash Khawaja <okash.khawaja@gmail.com> - 2017-07-13 13:30 +0200
        [patch v2 0/1] staging: speakup: safely close tty Okash Khawaja <okash.khawaja@gmail.com> - 2017-07-16 11:40 +0200
          [patch v2 1/1] staging: speakup: safely close tty Okash Khawaja <okash.khawaja@gmail.com> - 2017-07-16 11:40 +0200

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