From: <gregkh@linuxfoundation.org>
To: arnd@arndb.de, gregkh@linuxfoundation.org, sergey.senozhatsky@gmail.com
Cc: <stable@vger.kernel.org>, <stable-commits@vger.kernel.org>
Subject: Patch "tty: fix __tty_insert_flip_char regression" has been added to the 4.13-stable tree
Date: Thu, 21 Sep 2017 13:37:10 +0200 [thread overview]
Message-ID: <150599383093167@kroah.com> (raw)
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 4.13-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-4.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From 8a5a90a2a477b86a3dc2eaa5a706db9bfdd647ca Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Wed, 2 Aug 2017 13:11:39 +0200
Subject: tty: fix __tty_insert_flip_char regression
From: Arnd Bergmann <arnd@arndb.de>
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.
Fixes: 979990c62848 ("tty: improve tty_insert_flip_char() fast path")
Reported-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Tested-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/tty/tty_buffer.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/tty/tty_buffer.c
+++ b/drivers/tty/tty_buffer.c
@@ -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 arnd@arndb.de are
queue-4.13/tty-fix-__tty_insert_flip_char-regression.patch
queue-4.13/tty-improve-tty_insert_flip_char-fast-path.patch
queue-4.13/tty-improve-tty_insert_flip_char-slow-path.patch
reply other threads:[~2017-09-21 11:37 UTC|newest]
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