soc: qcom: pmic_glink: Fix race during initialization

commit 3568affcddd68743e25aa3ec1647d9b82797757b upstream.

As pointed out by Stephen Boyd it is possible that during initialization
of the pmic_glink child drivers, the protection-domain notifiers fires,
and the associated work is scheduled, before the client registration
returns and as a result the local "client" pointer has been initialized.

The outcome of this is a NULL pointer dereference as the "client"
pointer is blindly dereferenced.

Timeline provided by Stephen:
 CPU0                               CPU1
 ----                               ----
 ucsi->client = NULL;
 devm_pmic_glink_register_client()
  client->pdr_notify(client->priv, pg->client_state)
   pmic_glink_ucsi_pdr_notify()
    schedule_work(&ucsi->register_work)
    <schedule away>
                                    pmic_glink_ucsi_register()
                                     ucsi_register()
                                      pmic_glink_ucsi_read_version()
                                       pmic_glink_ucsi_read()
                                        pmic_glink_ucsi_read()
                                         pmic_glink_send(ucsi->client)
                                         <client is NULL BAD>
 ucsi->client = client // Too late!

This code is identical across the altmode, battery manager and usci
child drivers.

Resolve this by splitting the allocation of the "client" object and the
registration thereof into two operations.

This only happens if the protection domain registry is populated at the
time of registration, which by the introduction of commit '1ebcde047c54
("soc: qcom: add pd-mapper implementation")' became much more likely.

Reported-by: Amit Pundir <amit.pundir@linaro.org>
Closes: https://lore.kernel.org/all/CAMi1Hd2_a7TjA7J9ShrAbNOd_CoZ3D87twmO5t+nZxC9sX18tA@mail.gmail.com/
Reported-by: Johan Hovold <johan@kernel.org>
Closes: https://lore.kernel.org/all/ZqiyLvP0gkBnuekL@hovoldconsulting.com/
Reported-by: Stephen Boyd <swboyd@chromium.org>
Closes: https://lore.kernel.org/all/CAE-0n52JgfCBWiFQyQWPji8cq_rCsviBpW-m72YitgNfdaEhQg@mail.gmail.com/
Fixes: 58ef4ece1e41 ("soc: qcom: pmic_glink: Introduce base PMIC GLINK driver")
Cc: stable@vger.kernel.org
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Tested-by: Amit Pundir <amit.pundir@linaro.org>
Reviewed-by: Johan Hovold <johan+linaro@kernel.org>
Acked-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Tested-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com>
Link: https://lore.kernel.org/r/20240820-pmic-glink-v6-11-races-v3-1-eec53c750a04@quicinc.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

5 files changed, 55 insertions, 33 deletions

diff --git a/drivers/power/supply/qcom_battmgr.c b/drivers/power/supply/qcom_battmgr.c
index 44c6301f5f174..5b3681b9100c1 100644
--- a/drivers/power/supply/qcom_battmgr.c
+++ b/drivers/power/supply/qcom_battmgr.c
@@ -1384,12 +1384,16 @@ static int qcom_battmgr_probe(struct auxiliary_device *adev,
 					     "failed to register wireless charing power supply\n");
 	}
 
-	battmgr->client = devm_pmic_glink_register_client(dev,
-							  PMIC_GLINK_OWNER_BATTMGR,
-							  qcom_battmgr_callback,
-							  qcom_battmgr_pdr_notify,
-							  battmgr);
-	return PTR_ERR_OR_ZERO(battmgr->client);
+	battmgr->client = devm_pmic_glink_client_alloc(dev, PMIC_GLINK_OWNER_BATTMGR,
+						       qcom_battmgr_callback,
+						       qcom_battmgr_pdr_notify,
+						       battmgr);
+	if (IS_ERR(battmgr->client))
+		return PTR_ERR(battmgr->client);
+
+	pmic_glink_client_register(battmgr->client);
+
+	return 0;
 }
 
 static const struct auxiliary_device_id qcom_battmgr_id_table[] = {
diff --git a/drivers/soc/qcom/pmic_glink.c b/drivers/soc/qcom/pmic_glink.c
index ffb8ed69999d2..7e50eeb4cc6f2 100644
--- a/drivers/soc/qcom/pmic_glink.c
+++ b/drivers/soc/qcom/pmic_glink.c
@@ -69,15 +69,14 @@ static void _devm_pmic_glink_release_client(struct device *dev, void *res)
 	spin_unlock_irqrestore(&pg->client_lock, flags);
 }
 
-struct pmic_glink_client *devm_pmic_glink_register_client(struct device *dev,
-							  unsigned int id,
-							  void (*cb)(const void *, size_t, void *),
-							  void (*pdr)(void *, int),
-							  void *priv)
+struct pmic_glink_client *devm_pmic_glink_client_alloc(struct device *dev,
+						       unsigned int id,
+						       void (*cb)(const void *, size_t, void *),
+						       void (*pdr)(void *, int),
+						       void *priv)
 {
 	struct pmic_glink_client *client;
 	struct pmic_glink *pg = dev_get_drvdata(dev->parent);
-	unsigned long flags;
 
 	client = devres_alloc(_devm_pmic_glink_release_client, sizeof(*client), GFP_KERNEL);
 	if (!client)
@@ -88,6 +87,18 @@ struct pmic_glink_client *devm_pmic_glink_register_client(struct device *dev,
 	client->cb = cb;
 	client->pdr_notify = pdr;
 	client->priv = priv;
+	INIT_LIST_HEAD(&client->node);
+
+	devres_add(dev, client);
+
+	return client;
+}
+EXPORT_SYMBOL_GPL(devm_pmic_glink_client_alloc);
+
+void pmic_glink_client_register(struct pmic_glink_client *client)
+{
+	struct pmic_glink *pg = client->pg;
+	unsigned long flags;
 
 	mutex_lock(&pg->state_lock);
 	spin_lock_irqsave(&pg->client_lock, flags);
@@ -98,11 +109,8 @@ struct pmic_glink_client *devm_pmic_glink_register_client(struct device *dev,
 	spin_unlock_irqrestore(&pg->client_lock, flags);
 	mutex_unlock(&pg->state_lock);
 
-	devres_add(dev, client);
-
-	return client;
 }
-EXPORT_SYMBOL_GPL(devm_pmic_glink_register_client);
+EXPORT_SYMBOL_GPL(pmic_glink_client_register);
 
 int pmic_glink_send(struct pmic_glink_client *client, void *data, size_t len)
 {
diff --git a/drivers/soc/qcom/pmic_glink_altmode.c b/drivers/soc/qcom/pmic_glink_altmode.c
index a35df66bb07b5..60b0d79efb0f1 100644
--- a/drivers/soc/qcom/pmic_glink_altmode.c
+++ b/drivers/soc/qcom/pmic_glink_altmode.c
@@ -529,12 +529,17 @@ static int pmic_glink_altmode_probe(struct auxiliary_device *adev,
 			return ret;
 	}
 
-	altmode->client = devm_pmic_glink_register_client(dev,
-							  altmode->owner_id,
-							  pmic_glink_altmode_callback,
-							  pmic_glink_altmode_pdr_notify,
-							  altmode);
-	return PTR_ERR_OR_ZERO(altmode->client);
+	altmode->client = devm_pmic_glink_client_alloc(dev,
+						       altmode->owner_id,
+						       pmic_glink_altmode_callback,
+						       pmic_glink_altmode_pdr_notify,
+						       altmode);
+	if (IS_ERR(altmode->client))
+		return PTR_ERR(altmode->client);
+
+	pmic_glink_client_register(altmode->client);
+
+	return 0;
 }
 
 static const struct auxiliary_device_id pmic_glink_altmode_id_table[] = {
diff --git a/drivers/usb/typec/ucsi/ucsi_glink.c b/drivers/usb/typec/ucsi/ucsi_glink.c
index 7625e28e12a80..94f2df02f06ee 100644
--- a/drivers/usb/typec/ucsi/ucsi_glink.c
+++ b/drivers/usb/typec/ucsi/ucsi_glink.c
@@ -376,12 +376,16 @@ static int pmic_glink_ucsi_probe(struct auxiliary_device *adev,
 					"failed to acquire orientation-switch\n");
 	}
 
-	ucsi->client = devm_pmic_glink_register_client(dev,
-						       PMIC_GLINK_OWNER_USBC,
-						       pmic_glink_ucsi_callback,
-						       pmic_glink_ucsi_pdr_notify,
-						       ucsi);
-	return PTR_ERR_OR_ZERO(ucsi->client);
+	ucsi->client = devm_pmic_glink_client_alloc(dev, PMIC_GLINK_OWNER_USBC,
+						    pmic_glink_ucsi_callback,
+						    pmic_glink_ucsi_pdr_notify,
+						    ucsi);
+	if (IS_ERR(ucsi->client))
+		return PTR_ERR(ucsi->client);
+
+	pmic_glink_client_register(ucsi->client);
+
+	return 0;
 }
 
 static void pmic_glink_ucsi_remove(struct auxiliary_device *adev)
diff --git a/include/linux/soc/qcom/pmic_glink.h b/include/linux/soc/qcom/pmic_glink.h
index fd124aa18c81a..7cddf10277528 100644
--- a/include/linux/soc/qcom/pmic_glink.h
+++ b/include/linux/soc/qcom/pmic_glink.h
@@ -23,10 +23,11 @@ struct pmic_glink_hdr {
 
 int pmic_glink_send(struct pmic_glink_client *client, void *data, size_t len);
 
-struct pmic_glink_client *devm_pmic_glink_register_client(struct device *dev,
-							  unsigned int id,
-							  void (*cb)(const void *, size_t, void *),
-							  void (*pdr)(void *, int),
-							  void *priv);
+struct pmic_glink_client *devm_pmic_glink_client_alloc(struct device *dev,
+						       unsigned int id,
+						       void (*cb)(const void *, size_t, void *),
+						       void (*pdr)(void *, int),
+						       void *priv);
+void pmic_glink_client_register(struct pmic_glink_client *client);
 
 #endif