Patch "tty: fix __tty_insert_flip_char regression" has been added to the 4.9-stable tree

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

tty: fix __tty_insert_flip_char regression

to the 4.9-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-__tty_insert_flip_char-regression.patch
and it can be found in the queue-4.9 subdirectory.

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

From: Arnd Bergmann <[email protected]>
Date: Wed, 2 Aug 2017 13:11:39 +0200
Subject: tty: fix __tty_insert_flip_char regression

From: Arnd Bergmann <[email protected]>

commit 8a5a90a2a477b86a3dc2eaa5a706db9bfdd647ca upstream.

Sergey noticed a small but fatal mistake in __tty_insert_flip_char, leading to an oops in an interrupt handler when using any serial port.

The problem is that I accidentally took the tty_buffer pointer before calling __tty_buffer_request_room(), which replaces the buffer. This moves the pointer lookup to the right place after allocating the new buffer space.

---
 drivers/tty/tty_buffer.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

@@ -372,12 +372,13 @@ EXPORT_SYMBOL(tty_insert_flip_string_fla
  */
 int __tty_insert_flip_char(struct tty_port *port, unsigned char ch, char flag)
 {
-	struct tty_buffer *tb = port->buf.tail;
+	struct tty_buffer *tb;
 	int flags = (flag == TTY_NORMAL) ? TTYB_NORMAL : 0;
 
 	if (!__tty_buffer_request_room(port, 1, flags))
 		return 0;
 
+	tb = port->buf.tail;
 	if (~tb->flags & TTYB_NORMAL)
 		*flag_buf_ptr(tb, tb->used) = flag;
 	*char_buf_ptr(tb, tb->used++) = ch;

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

queue-4.9/tty-fix-__tty_insert_flip_char-regression.patch queue-4.9/tty-improve-tty_insert_flip_char-fast-path.patch queue-4.9/tty-improve-tty_insert_flip_char-slow-path.patch