linux-kernel - [PATCH] soc: qcom: aoss: Fix the out of bound usage of cooling

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Date:   Mon, 28 Jun 2021 22:57:41 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     bjorn.andersson@...aro.org
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        thara.gopinath@...aro.org,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        stable@...r.kernel.org
Subject: [PATCH] soc: qcom: aoss: Fix the out of bound usage of cooling_devs

In "qmp_cooling_devices_register", the count value is initially
QMP_NUM_COOLING_RESOURCES, which is 2. Based on the initial count value,
the memory for cooling_devs is allocated. Then while calling the
"qmp_cooling_device_add" function, count value is post-incremented for
each child node.

This makes the out of bound access to the cooling_dev array. Fix it by
resetting the count value to zero before adding cooling devices.

While at it, let's also free the memory allocated to cooling_dev if no
cooling device is found in DT and during unroll phase.

Cc: stable@...r.kernel.org # 5.4
Fixes: 05589b30b21a ("soc: qcom: Extend AOSS QMP driver to support resources that are used to wake up the SoC.")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---

Bjorn: I've just compile tested this patch.

 drivers/soc/qcom/qcom_aoss.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/soc/qcom/qcom_aoss.c b/drivers/soc/qcom/qcom_aoss.c
index 934fcc4d2b05..98c665411768 100644
--- a/drivers/soc/qcom/qcom_aoss.c
+++ b/drivers/soc/qcom/qcom_aoss.c
@@ -488,6 +488,7 @@ static int qmp_cooling_devices_register(struct qmp *qmp)
 	if (!qmp->cooling_devs)
 		return -ENOMEM;
 
+	count = 0;
 	for_each_available_child_of_node(np, child) {
 		if (!of_find_property(child, "#cooling-cells", NULL))
 			continue;
@@ -497,12 +498,16 @@ static int qmp_cooling_devices_register(struct qmp *qmp)
 			goto unroll;
 	}
 
+	if (!count)
+		devm_kfree(qmp->dev, qmp->cooling_devs);
+
 	return 0;
 
 unroll:
 	while (--count >= 0)
 		thermal_cooling_device_unregister
 			(qmp->cooling_devs[count].cdev);
+	devm_kfree(qmp->dev, qmp->cooling_devs);
 
 	return ret;
 }
-- 
2.25.1