[PATCH 3.16 062/233] serial: ifx6x60: fix use-after-free on module unload

From	Ben Hutchings <ben@decadent.org.uk>
Newsgroups	linux.kernel
Subject	[PATCH 3.16 062/233] serial: ifx6x60: fix use-after-free on module unload
Date	2017-09-10 01:50 +0200
Message-ID	<unXFD-43x-11@gated-at.bofh.it> (permalink)
References	<unWqd-3ep-3@gated-at.bofh.it>
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3.16.48-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <johan@kernel.org>

commit 1e948479b3d63e3ac0ecca13cbf4921c7d17c168 upstream.

Make sure to deregister the SPI driver before releasing the tty driver
to avoid use-after-free in the SPI remove callback where the tty
devices are deregistered.

Fixes: 72d4724ea54c ("serial: ifx6x60: Add modem power off function in the platform reboot process")
Cc: Jun Chen <jun.d.chen@intel.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 drivers/tty/serial/ifx6x60.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/tty/serial/ifx6x60.c
+++ b/drivers/tty/serial/ifx6x60.c
@@ -1379,9 +1379,9 @@ static struct spi_driver ifx_spi_driver
 static void __exit ifx_spi_exit(void)
 {
 	/* unregister */
+	spi_unregister_driver(&ifx_spi_driver);
 	tty_unregister_driver(tty_drv);
 	put_tty_driver(tty_drv);
-	spi_unregister_driver(&ifx_spi_driver);
 	unregister_reboot_notifier(&ifx_modem_reboot_notifier_block);
 }

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[PATCH 3.16 062/233] serial: ifx6x60: fix use-after-free on  module unload Ben Hutchings <ben@decadent.org.uk> - 2017-09-10 01:50 +0200

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