Patch "tty: Fix GPF in flush_to_ldisc(), part 2" has been added to the 4.5-stable tree

This is a note to let you know that I've just added the patch titled

tty: Fix GPF in flush_to_ldisc(), part 2

to the 4.5-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:
tty-fix-gpf-in-flush_to_ldisc-part-2.patch
and it can be found in the queue-4.5 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Peter Hurley <[email protected]>
Date: Sun, 10 Jan 2016 20:36:12 -0800
Subject: tty: Fix GPF in flush_to_ldisc(), part 2

From: Peter Hurley <[email protected]>

commit f33798deecbd59a2955f40ac0ae2bc7dff54c069 upstream.

commit 9ce119f318ba ("tty: Fix GPF in flush_to_ldisc()") fixed a GPF caused by a line discipline which does not define a receive_buf() method.

However, the vt driver (and speakup driver also) pushes selection data directly to the line discipline receive_buf() method via tty_ldisc_receive_buf(). Fix the same problem in tty_ldisc_receive_buf().

---
 include/linux/tty.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -589,7 +589,7 @@ static inline int tty_ldisc_receive_buf(
 		count = ld->ops->receive_buf2(ld->tty, p, f, count);
 	else {
 		count = min_t(int, count, ld->tty->receive_room);
-		if (count)
+		if (count && ld->ops->receive_buf)
 			ld->ops->receive_buf(ld->tty, p, f, count);
 	}
 	return count;

Patches currently in stable-queue which might be from [email protected] are

queue-4.5/tty-fix-gpf-in-flush_to_ldisc-part-2.patch queue-4.5/8250-use-callbacks-to-access-uart_dll-uart_dlm.patch queue-4.5/net-irda-fix-use-after-free-in-irtty_open.patch