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usb: typec: Make sure an alt mode exist before getting its partner

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Adding check to typec_altmode_get_partner() to prevent
potential NULL pointer dereference.

Reported-by: Vladimir Yerilov <openmindead@gmail.com>
Fixes: ad74b8649b ("usb: typec: ucsi: Preliminary support for alternate modes")
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Heikki Krogerus 2019-06-12 17:15:40 +03:00 committed by Greg Kroah-Hartman
parent c2ed3d474f
commit 5f54a85db5
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/typec/bus.c
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@ -192,7 +192,7 @@ EXPORT_SYMBOL_GPL(typec_altmode_vdm);
const struct typec_altmode * const struct typec_altmode *
typec_altmode_get_partner(struct typec_altmode *adev) 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); EXPORT_SYMBOL_GPL(typec_altmode_get_partner);