USB: serial: io_ti: fix NULL-deref at open
commit32631d1a739f919db4dea05c98543fa4fcfcb7c6
authorJohan Hovold <johan@kernel.org>
Tue, 3 Jan 2017 15:39:43 +0000 (3 16:39 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 12 Jan 2017 10:39:14 +0000 (12 11:39 +0100)
tree29b853d585ed7cb9b9cf5fe65a3e0bcb8acd7e31
parentb5264ea24484c8d34a0db7ed9085ab41cfc00576
USB: serial: io_ti: fix NULL-deref at open

commit a323fefc6f5079844dc62ffeb54f491d0242ca35 upstream.

Fix NULL-pointer dereference when clearing halt at open should a
malicious device lack the expected endpoints when in download mode.

Unable to handle kernel NULL pointer dereference at virtual address 00000030
...
[<bf011ed8>] (edge_open [io_ti]) from [<bf000118>] (serial_port_activate+0x68/0x98 [usbserial])
[<bf000118>] (serial_port_activate [usbserial]) from [<c0470ca4>] (tty_port_open+0x9c/0xe8)
[<c0470ca4>] (tty_port_open) from [<bf000da0>] (serial_open+0x48/0x6c [usbserial])
[<bf000da0>] (serial_open [usbserial]) from [<c0469178>] (tty_open+0xcc/0x5cc)

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/serial/io_ti.c