linux-kernel - [PATCH v5 03/17] EDAC/qcom: Do not pass llcc_driv_data as edac_device_ctl_info's pvt

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Date:   Wed, 28 Dec 2022 14:10:14 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     andersson@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, bp@...en8.de,
        tony.luck@...el.com
Cc:     quic_saipraka@...cinc.com, konrad.dybcio@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        james.morse@....com, mchehab@...nel.org, rric@...nel.org,
        linux-edac@...r.kernel.org, quic_ppareek@...cinc.com,
        luca.weiss@...rphone.com, ahalaney@...hat.com, steev@...i.org,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        stable@...r.kernel.org
Subject: [PATCH v5 03/17] EDAC/qcom: Do not pass llcc_driv_data as edac_device_ctl_info's pvt_info

The memory for "llcc_driv_data" is allocated by the LLCC driver. But when
it is passed as "pvt_info" to the EDAC core, it will get freed during the
qcom_edac driver release. So when the qcom_edac driver gets probed again,
it will try to use the freed data leading to the use-after-free bug.

Fix this by not passing "llcc_driv_data" as pvt_info but rather reference
it using the "platform_data" in the qcom_edac driver.

Cc: <stable@...r.kernel.org> # 4.20
Fixes: 27450653f1db ("drivers: edac: Add EDAC driver support for QCOM SoCs")
Tested-by: Steev Klimaszewski <steev@...i.org> # Thinkpad X13s
Tested-by: Andrew Halaney <ahalaney@...hat.com> # sa8540p-ride
Reported-by: Steev Klimaszewski <steev@...i.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 drivers/edac/qcom_edac.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/edac/qcom_edac.c b/drivers/edac/qcom_edac.c
index 9e77fa84e84f..3256254c3722 100644
--- a/drivers/edac/qcom_edac.c
+++ b/drivers/edac/qcom_edac.c
@@ -252,7 +252,7 @@ dump_syn_reg_values(struct llcc_drv_data *drv, u32 bank, int err_type)
 static int
 dump_syn_reg(struct edac_device_ctl_info *edev_ctl, int err_type, u32 bank)
 {
-	struct llcc_drv_data *drv = edev_ctl->pvt_info;
+	struct llcc_drv_data *drv = edev_ctl->dev->platform_data;
 	int ret;
 
 	ret = dump_syn_reg_values(drv, bank, err_type);
@@ -289,7 +289,7 @@ static irqreturn_t
 llcc_ecc_irq_handler(int irq, void *edev_ctl)
 {
 	struct edac_device_ctl_info *edac_dev_ctl = edev_ctl;
-	struct llcc_drv_data *drv = edac_dev_ctl->pvt_info;
+	struct llcc_drv_data *drv = edac_dev_ctl->dev->platform_data;
 	irqreturn_t irq_rc = IRQ_NONE;
 	u32 drp_error, trp_error, i;
 	int ret;
@@ -358,7 +358,6 @@ static int qcom_llcc_edac_probe(struct platform_device *pdev)
 	edev_ctl->dev_name = dev_name(dev);
 	edev_ctl->ctl_name = "llcc";
 	edev_ctl->panic_on_ue = LLCC_ERP_PANIC_ON_UE;
-	edev_ctl->pvt_info = llcc_driv_data;
 
 	rc = edac_device_add_device(edev_ctl);
 	if (rc)
-- 
2.25.1