From: Johan Hovold <johan@kernel.org>
To: linux-usb@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Rainer Weikusat <rainer.weikusat@sncag.com>,
Johan Hovold <johan@kernel.org>, stable <stable@vger.kernel.org>
Subject: [PATCH] USB: serial: keyspan: fix NULL-derefs on open() and write()
Date: Thu, 3 Oct 2019 15:49:58 +0200 [thread overview]
Message-ID: <20191003134958.8692-1-johan@kernel.org> (raw)
Fix NULL-pointer dereferences on open() and write() which can be
triggered by a malicious USB device.
The current URB allocation helper would fail to initialise the newly
allocated URB if the device has unexpected endpoint descriptors,
something which could lead NULL-pointer dereferences in a number of
open() and write() paths when accessing the URB. For example:
BUG: kernel NULL pointer dereference, address: 0000000000000000
...
RIP: 0010:usb_clear_halt+0x11/0xc0
...
Call Trace:
? tty_port_open+0x4d/0xd0
keyspan_open+0x70/0x160 [keyspan]
serial_port_activate+0x5b/0x80 [usbserial]
tty_port_open+0x7b/0xd0
? check_tty_count+0x43/0xa0
tty_open+0xf1/0x490
BUG: kernel NULL pointer dereference, address: 0000000000000000
...
RIP: 0010:keyspan_write+0x14e/0x1f3 [keyspan]
...
Call Trace:
serial_write+0x43/0xa0 [usbserial]
n_tty_write+0x1af/0x4f0
? do_wait_intr_irq+0x80/0x80
? process_echoes+0x60/0x60
tty_write+0x13f/0x2f0
BUG: kernel NULL pointer dereference, address: 0000000000000000
...
RIP: 0010:keyspan_usa26_send_setup+0x298/0x305 [keyspan]
...
Call Trace:
keyspan_open+0x10f/0x160 [keyspan]
serial_port_activate+0x5b/0x80 [usbserial]
tty_port_open+0x7b/0xd0
? check_tty_count+0x43/0xa0
tty_open+0xf1/0x490
Fixes: fdcba53e2d58 ("fix for bugzilla #7544 (keyspan USB-to-serial converter)")
Cc: stable <stable@vger.kernel.org> # 2.6.21
Signed-off-by: Johan Hovold <johan@kernel.org>
---
drivers/usb/serial/keyspan.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/serial/keyspan.c b/drivers/usb/serial/keyspan.c
index d34779fe4a8d..e66a59ef43a1 100644
--- a/drivers/usb/serial/keyspan.c
+++ b/drivers/usb/serial/keyspan.c
@@ -1741,8 +1741,8 @@ static struct urb *keyspan_setup_urb(struct usb_serial *serial, int endpoint,
ep_desc = find_ep(serial, endpoint);
if (!ep_desc) {
- /* leak the urb, something's wrong and the callers don't care */
- return urb;
+ usb_free_urb(urb);
+ return NULL;
}
if (usb_endpoint_xfer_int(ep_desc)) {
ep_type_name = "INT";
--
2.23.0
next reply other threads:[~2019-10-03 13:50 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-03 13:49 Johan Hovold [this message]
2019-10-04 8:54 ` [PATCH] USB: serial: keyspan: fix NULL-derefs on open() and write() Greg Kroah-Hartman
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