usb: phy: Initialize struct usb_phy list_head

As part of the registration of a new 'struct usb_phy' with the USB PHY core
via either usb_add_phy(struct usb_phy *x, ...) or usb_add_phy_dev(struct
usb_phy *x) these functions call list_add_tail(&x->head, phy_list) in
order for the new instance x to be stored in phy_list, a static list
kept internally by the core.

After 7d21114dc6a2 ("usb: phy: Introduce one extcon device into usb phy")
when executing either of the registration functions above it is possible
that usb_add_extcon() fails, leading to either function returning before
the call to list_add_tail(), leaving x->head uninitialized.

Then, when a driver tries to undo the failed registration by calling
usb_remove_phy(struct usb_phy *x) there will be an unconditional call to
list_del(&x->head) acting on an uninitialized variable, and thus a
possible NULL pointer dereference.

Fix this by initializing x->head before usb_add_extcon() has a
chance to fail. Note that this was not needed before 7d21114dc6a2 since
list_add_phy() was executed unconditionally and it guaranteed that x->head
was initialized.

Fixes: 7d21114dc6a2 ("usb: phy: Introduce one extcon device into usb phy")
Cc: stable <stable@kernel.org>
Signed-off-by: Diogo Ivo <diogo.ivo@tecnico.ulisboa.pt>
Link: https://patch.msgid.link/20251121-diogo-smaug_typec-v2-1-5c37c1169d57@tecnico.ulisboa.pt
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/phy/phy.c b/drivers/usb/phy/phy.c
index e1435bc596622ce40f64355573f82f57bc8282bf..5a9b9353f343d504f874354b32cc407d18b0aaa1 100644 (file)
--- a/drivers/usb/phy/phy.c
+++ b/drivers/usb/phy/phy.c
@@ -646,6 +646,8 @@ int usb_add_phy(struct usb_phy *x, enum usb_phy_type type)
                return -EINVAL;
        }
 
+       INIT_LIST_HEAD(&x->head);
+
        usb_charger_init(x);
        ret = usb_add_extcon(x);
        if (ret)
@@ -696,6 +698,8 @@ int usb_add_phy_dev(struct usb_phy *x)
                return -EINVAL;
        }
 
+       INIT_LIST_HEAD(&x->head);
+
        usb_charger_init(x);
        ret = usb_add_extcon(x);
        if (ret)