EDAC/qcom: Do not pass llcc_driv_data as edac_device_ctl_info's pvt_info

commit 977c6ba624f24ae20cf0faee871257a39348d4a9 upstream.

The memory for llcc_driv_data is allocated by the LLCC driver. But when
it is passed as the private driver 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.

Hence, do not pass llcc_driv_data as pvt_info but rather reference it
using the platform_data pointer in the qcom_edac driver.

Fixes: d88dc4e7cace ("drivers: edac: Add EDAC driver support for QCOM SoCs")
Reported-by: Steev Klimaszewski <steev@kali.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: Steev Klimaszewski <steev@kali.org> # Thinkpad X13s
Tested-by: Andrew Halaney <ahalaney@redhat.com> # sa8540p-ride
Cc: <stable@vger.kernel.org> # 4.20
Link: https://lore.kernel.org/r/20230118150904.26913-4-manivannan.sadhasivam@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/edac/qcom_edac.c b/drivers/edac/qcom_edac.c
index 97a27e42dd610db0d3cf656357bf7421e57b56ff..c45519f59dc11b5d4954a04390c321d28b57d114 100644 (file)
--- a/drivers/edac/qcom_edac.c
+++ b/drivers/edac/qcom_edac.c
@@ -252,7 +252,7 @@ clear:
 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)