From: <gregkh@linuxfoundation.org>
To: badhri@google.com,dmitry.baryshkov@linaro.org,gregkh@linuxfoundation.org,heikki.krogerus@linux.intel.com
Cc: <stable@vger.kernel.org>
Subject: FAILED: patch "[PATCH] usb: typec: tcpm: Check for port partner validity before" failed to apply to 5.15-stable tree
Date: Mon, 13 May 2024 15:23:12 +0200 [thread overview]
Message-ID: <2024051312-grumble-contour-16d3@gregkh> (raw)
The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x ae11f04b452b5205536e1c02d31f8045eba249dd
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2024051312-grumble-contour-16d3@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..
Possible dependencies:
ae11f04b452b ("usb: typec: tcpm: Check for port partner validity before consuming it")
c97cd0b4b54e ("usb: typec: tcpm: set initial svdm version based on pd revision")
8203d26905ee ("usb: typec: tcpm: Register USB Power Delivery Capabilities")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From ae11f04b452b5205536e1c02d31f8045eba249dd Mon Sep 17 00:00:00 2001
From: Badhri Jagan Sridharan <badhri@google.com>
Date: Sat, 27 Apr 2024 20:28:12 +0000
Subject: [PATCH] usb: typec: tcpm: Check for port partner validity before
consuming it
typec_register_partner() does not guarantee partner registration
to always succeed. In the event of failure, port->partner is set
to the error value or NULL. Given that port->partner validity is
not checked, this results in the following crash:
Unable to handle kernel NULL pointer dereference at virtual address xx
pc : run_state_machine+0x1bc8/0x1c08
lr : run_state_machine+0x1b90/0x1c08
..
Call trace:
run_state_machine+0x1bc8/0x1c08
tcpm_state_machine_work+0x94/0xe4
kthread_worker_fn+0x118/0x328
kthread+0x1d0/0x23c
ret_from_fork+0x10/0x20
To prevent the crash, check for port->partner validity before
derefencing it in all the call sites.
Cc: stable@vger.kernel.org
Fixes: c97cd0b4b54e ("usb: typec: tcpm: set initial svdm version based on pd revision")
Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20240427202812.3435268-1-badhri@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 53c1f308ebd7..8a1af08f71b6 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -1584,7 +1584,8 @@ static void svdm_consume_identity(struct tcpm_port *port, const u32 *p, int cnt)
port->partner_ident.cert_stat = p[VDO_INDEX_CSTAT];
port->partner_ident.product = product;
- typec_partner_set_identity(port->partner);
+ if (port->partner)
+ typec_partner_set_identity(port->partner);
tcpm_log(port, "Identity: %04x:%04x.%04x",
PD_IDH_VID(vdo),
@@ -1746,6 +1747,9 @@ static void tcpm_register_partner_altmodes(struct tcpm_port *port)
struct typec_altmode *altmode;
int i;
+ if (!port->partner)
+ return;
+
for (i = 0; i < modep->altmodes; i++) {
altmode = typec_partner_register_altmode(port->partner,
&modep->altmode_desc[i]);
@@ -4238,7 +4242,10 @@ static int tcpm_init_vconn(struct tcpm_port *port)
static void tcpm_typec_connect(struct tcpm_port *port)
{
+ struct typec_partner *partner;
+
if (!port->connected) {
+ port->connected = true;
/* Make sure we don't report stale identity information */
memset(&port->partner_ident, 0, sizeof(port->partner_ident));
port->partner_desc.usb_pd = port->pd_capable;
@@ -4248,9 +4255,13 @@ static void tcpm_typec_connect(struct tcpm_port *port)
port->partner_desc.accessory = TYPEC_ACCESSORY_AUDIO;
else
port->partner_desc.accessory = TYPEC_ACCESSORY_NONE;
- port->partner = typec_register_partner(port->typec_port,
- &port->partner_desc);
- port->connected = true;
+ partner = typec_register_partner(port->typec_port, &port->partner_desc);
+ if (IS_ERR(partner)) {
+ dev_err(port->dev, "Failed to register partner (%ld)\n", PTR_ERR(partner));
+ return;
+ }
+
+ port->partner = partner;
typec_partner_set_usb_power_delivery(port->partner, port->partner_pd);
}
}
@@ -4330,9 +4341,11 @@ static void tcpm_typec_disconnect(struct tcpm_port *port)
port->plug_prime = NULL;
port->cable = NULL;
if (port->connected) {
- typec_partner_set_usb_power_delivery(port->partner, NULL);
- typec_unregister_partner(port->partner);
- port->partner = NULL;
+ if (port->partner) {
+ typec_partner_set_usb_power_delivery(port->partner, NULL);
+ typec_unregister_partner(port->partner);
+ port->partner = NULL;
+ }
port->connected = false;
}
}
@@ -4556,6 +4569,9 @@ static enum typec_cc_status tcpm_pwr_opmode_to_rp(enum typec_pwr_opmode opmode)
static void tcpm_set_initial_svdm_version(struct tcpm_port *port)
{
+ if (!port->partner)
+ return;
+
switch (port->negotiated_rev) {
case PD_REV30:
break;
reply other threads:[~2024-05-13 13:23 UTC|newest]
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