This is a note to let you know that I've just added the patch titled
staging/speakup: Use tty_ldisc_ref() for paste kworker
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
staging-speakup-use-tty_ldisc_ref-for-paste-kworker.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f4f9edcf9b5289ed96113e79fa65a7bf27ecb096 Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
Date: Sun, 10 Jan 2016 22:40:58 -0800
Subject: staging/speakup: Use tty_ldisc_ref() for paste kworker
From: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
commit f4f9edcf9b5289ed96113e79fa65a7bf27ecb096 upstream.
As the function documentation for tty_ldisc_ref_wait() notes, it is
only callable from a tty file_operations routine; otherwise there
is no guarantee the ref won't be NULL.
The key difference with the VT's paste_selection() is that is an ioctl,
where __speakup_paste_selection() is completely async kworker, kicked
off from interrupt context.
Fixes: 28a821c30688 ("Staging: speakup: Update __speakup_paste_selection()
tty (ab)usage to match vt")
Signed-off-by: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/speakup/selection.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/staging/speakup/selection.c
+++ b/drivers/staging/speakup/selection.c
@@ -140,7 +140,9 @@ static void __speakup_paste_selection(st
struct tty_ldisc *ld;
DECLARE_WAITQUEUE(wait, current);
- ld = tty_ldisc_ref_wait(tty);
+ ld = tty_ldisc_ref(tty);
+ if (!ld)
+ goto tty_unref;
tty_buffer_lock_exclusive(&vc->port);
add_wait_queue(&vc->paste_wait, &wait);
@@ -160,6 +162,7 @@ static void __speakup_paste_selection(st
tty_buffer_unlock_exclusive(&vc->port);
tty_ldisc_deref(ld);
+tty_unref:
tty_kref_put(tty);
}
Patches currently in stable-queue which might be from peter@xxxxxxxxxxxxxxxxxx are
queue-3.14/staging-speakup-use-tty_ldisc_ref-for-paste-kworker.patch
queue-3.14/wan-x25-fix-use-after-free-in-x25_asy_open_tty.patch
queue-3.14/pty-make-sure-super_block-is-still-valid-in-final-dev-tty-close.patch
queue-3.14/pty-fix-possible-use-after-free-of-tty-driver_data.patch
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