From: Manivannan Sadhasivam manivannan.sadhasivam@linaro.org
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: 27450653f1db ("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@linar... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/edac/qcom_edac.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
--- 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 p 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)