This is a note to let you know that I've just added the patch titled
USB: cdc-acm: more sanity checking
to the 4.5-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:
usb-cdc-acm-more-sanity-checking.patch
and it can be found in the queue-4.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8835ba4a39cf53f705417b3b3a94eb067673f2c9 Mon Sep 17 00:00:00 2001
From: Oliver Neukum <oneukum@xxxxxxxx>
Date: Tue, 15 Mar 2016 10:14:04 +0100
Subject: USB: cdc-acm: more sanity checking
From: Oliver Neukum <oneukum@xxxxxxxx>
commit 8835ba4a39cf53f705417b3b3a94eb067673f2c9 upstream.
An attack has become available which pretends to be a quirky
device circumventing normal sanity checks and crashes the kernel
by an insufficient number of interfaces. This patch adds a check
to the code path for quirky devices.
Signed-off-by: Oliver Neukum <ONeukum@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/class/cdc-acm.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -1114,6 +1114,9 @@ static int acm_probe(struct usb_interfac
if (quirks == NO_UNION_NORMAL) {
data_interface = usb_ifnum_to_if(usb_dev, 1);
control_interface = usb_ifnum_to_if(usb_dev, 0);
+ /* we would crash */
+ if (!data_interface || !control_interface)
+ return -ENODEV;
goto skip_normal_probe;
}
Patches currently in stable-queue which might be from oneukum@xxxxxxxx are
queue-4.5/usb-cdc-acm-more-sanity-checking.patch
queue-4.5/usb-mct_u232-add-sanity-checking-in-probe.patch
queue-4.5/usb-digi_acceleport-do-sanity-checking-for-the-number-of-ports.patch
queue-4.5/usb-cypress_m8-add-endpoint-sanity-check.patch
queue-4.5/usb-retry-reset-if-a-device-times-out.patch
queue-4.5/usb-hub-fix-a-typo-in-hub_port_init-leading-to-wrong-logic.patch
queue-4.5/usb-usb_driver_claim_interface-add-sanity-checking.patch
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