Vulnerability CVE-2024-26715
Published: 2024-04-03

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

usb: dwc3: gadget: Fix NULL pointer dereference in dwc3_gadget_suspend

In current scenario if Plug-out and Plug-In performed continuously
there could be a chance while checking for dwc->gadget_driver in
dwc3_gadget_suspend, a NULL pointer dereference may occur.

Call Stack:

CPU1: CPU2:
gadget_unbind_driver dwc3_suspend_common
dwc3_gadget_stop dwc3_gadget_suspend
dwc3_disconnect_gadget

CPU1 basically clears the variable and CPU2 checks the variable.
Consider CPU1 is running and right before gadget_driver is cleared
and in parallel CPU2 executes dwc3_gadget_suspend where it finds
dwc->gadget_driver which is not NULL and resumes execution and then
CPU1 completes execution. CPU2 executes dwc3_disconnect_gadget where
it checks dwc->gadget_driver is already NULL because of which the
NULL pointer deference occur.

 References:
https://git.kernel.org/stable/c/88936ceab6b426f1312327e9ef849c215c6007a7
https://git.kernel.org/stable/c/57e2e42ccd3cd6183228269715ed032f44536751
https://git.kernel.org/stable/c/c7ebd8149ee519d27232e6e4940e9c02071b568b
https://git.kernel.org/stable/c/36695d5eeeefe5a64b47d0336e7c8fc144e78182
https://git.kernel.org/stable/c/61a348857e869432e6a920ad8ea9132e8d44c316
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