Vulnerability CVE-2024-42085
Published: 2024-07-29

Description:
In the Linux kernel, the following vulnerability has been resolved:

usb: dwc3: core: remove lock of otg mode during gadget suspend/resume to avoid deadlock

When config CONFIG_USB_DWC3_DUAL_ROLE is selected, and trigger system
to enter suspend status with below command:
echo mem > /sys/power/state
There will be a deadlock issue occurring. Detailed invoking path as
below:
dwc3_suspend_common()
spin_lock_irqsave(&dwc->lock, flags); <-- 1st
dwc3_gadget_suspend(dwc);
dwc3_gadget_soft_disconnect(dwc);
spin_lock_irqsave(&dwc->lock, flags); <-- 2nd
This issue is exposed by commit c7ebd8149ee5 ("usb: dwc3: gadget: Fix
NULL pointer dereference in dwc3_gadget_suspend") that removes the code
of checking whether dwc->gadget_driver is NULL or not. It causes the
following code is executed and deadlock occurs when trying to get the
spinlock. In fact, the root cause is the commit 5265397f9442("usb: dwc3:
Remove DWC3 locking during gadget suspend/resume") that forgot to remove
the lock of otg mode. So, remove the redundant lock of otg mode during
gadget suspend/resume.

 References:
https://git.kernel.org/stable/c/7026576e89094aa9a0062aa6d10cba18aa99944c
https://git.kernel.org/stable/c/d77e2b5104c51d3668b9717c825a4a06998efe63
https://git.kernel.org/stable/c/17e2956633ca560b95f1cbbb297cfc2adf650649
https://git.kernel.org/stable/c/f1274cfab183e69a7c7bafffcb4f50703c876276
https://git.kernel.org/stable/c/7838de15bb700c2898a7d741db9b1f3cbc86c136
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