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USB: dwc3: fix use-after-free on core driver unbind

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[ Upstream commit e3dbb65757 ]

Some dwc3 glue drivers are currently accessing the driver data of the
child core device directly, which is clearly a bad idea as the child may
not have probed yet or may have been unbound from its driver.

As a workaround until the glue drivers have been fixed, clear the driver
data pointer before allowing the glue parent device to runtime suspend
to prevent its driver from accessing data that has been freed during
unbind.

Fixes: 6dd2565989 ("usb: dwc3: add imx8mp dwc3 glue layer driver")
Fixes: 6895ea55c3 ("usb: dwc3: qcom: Configure wakeup interrupts during suspend")
Cc: stable@vger.kernel.org      # 5.12
Cc: Li Jun <jun.li@nxp.com>
Cc: Sandeep Maheswaram <quic_c_sanm@quicinc.com>
Cc: Krishna Kurapati <quic_kriskura@quicinc.com>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Message-ID: <20230607100540.31045-3-johan+linaro@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Johan Hovold 2023-06-07 12:05:40 +02:00 • committed by Justin Hammond
parent f80860dcb9
commit 54c306daeb
1 changed files with 5 additions and 0 deletions
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5
drivers/usb/dwc3/core.c
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@ -1719,6 +1719,11 @@ static int dwc3_remove(struct platform_device *pdev)
pm_runtime_allow(&pdev->dev);
pm_runtime_disable(&pdev->dev);
pm_runtime_put_noidle(&pdev->dev);
/*
* HACK: Clear the driver data, which is currently accessed by parent
* glue drivers, before allowing the parent to suspend.
*/
platform_set_drvdata(pdev, NULL);
pm_runtime_set_suspended(&pdev->dev);
dwc3_free_event_buffers(dwc);