Heikki Krogerus 7c96edc6e7 usb: typec: ucsi: Prevent mode overrun ... commit 386e15a650 upstream. Sometimes the embedded controller firmware does not terminate the list of alternate modes that the partner supports in its response to the GET_ALTERNATE_MODES command. Instead the firmware returns the supported alternate modes over and over again until the driver stops requesting them. If that happens, the number of modes for each alternate mode will exceed the maximum 6 that is defined in the USB Power Delivery specification. Making sure that can't happen by adding a check for it. This fixes NULL pointer dereference that is caused by the overrun. Fixes: ad74b8649b ("usb: typec: ucsi: Preliminary support for alternate modes") Cc: stable@vger.kernel.org Reported-by: Zwane Mwaikambo <zwanem@gmail.com> Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Link: https://lore.kernel.org/r/20200916090034.25119-3-heikki.krogerus@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-09-23 12:40:44 +02:00
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altmodes	usb: typec: Add driver for NVIDIA Alt Modes	2019-04-25 11:04:56 +02:00
mux	usb: typec: Registering real device entries for the muxes	2019-06-03 10:55:38 +02:00
tcpm	usb: typec: tcpci_rt1711h: avoid screaming irq causing boot hangs	2020-06-30 15:36:49 -04:00
ucsi	usb: typec: ucsi: Prevent mode overrun	2020-09-23 12:40:44 +02:00
Kconfig	usb: typec: tps6598x: Fix build error without CONFIG_REGMAP_I2C	2019-09-03 15:46:46 +02:00
Makefile	usb: typec: Group all TCPCI/TCPM code together	2018-09-20 13:37:29 +02:00
bus.c	usb: typec: altmode: Fix typec_altmode_get_partner sometimes returning an invalid pointer	2020-04-29 16:33:23 +02:00
bus.h	usb: typec: Registering real device entries for the muxes	2019-06-03 10:55:38 +02:00
class.c	usb: typec: fix use after free in typec_register_port()	2019-12-17 19:56:00 +01:00
mux.c	usb: typec: mux: Switch to use fwnode_property_count_uXX()	2019-07-25 11:07:42 +02:00
tps6598x.c	drivers/usb/typec/tps6598x.c: fix 4CC cmd write	2019-07-03 18:40:49 +02:00