From bda9b5a25952ad9adc2a6437d61adcd14d481b3b Mon Sep 17 00:00:00 2001 From: Heikki Krogerus Date: Wed, 12 Jun 2019 17:15:40 +0300 Subject: [PATCH] usb: typec: Make sure an alt mode exist before getting its partner Adding check to typec_altmode_get_partner() to prevent potential NULL pointer dereference. Reported-by: Vladimir Yerilov Fixes: 0bcf5fb2f39f ("usb: typec: ucsi: Preliminary support for alternate modes") Signed-off-by: Heikki Krogerus Signed-off-by: Greg Kroah-Hartman --- drivers/usb/typec/bus.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/typec/bus.c b/drivers/usb/typec/bus.c index 76299b6ff06da..74cb3c2ecb347 100644 --- a/drivers/usb/typec/bus.c +++ b/drivers/usb/typec/bus.c @@ -192,7 +192,7 @@ EXPORT_SYMBOL_GPL(typec_altmode_vdm); const struct typec_altmode * typec_altmode_get_partner(struct typec_altmode *adev) { - return &to_altmode(adev)->partner->adev; + return adev ? &to_altmode(adev)->partner->adev : NULL; } EXPORT_SYMBOL_GPL(typec_altmode_get_partner); -- 2.39.5