CVE-2024-26715

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CVE-2024-26715

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

Details: 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/36695d5eeeefe5a64b47d0336e7c8fc144e78182, https://git.kernel.org/stable/c/57e2e42ccd3cd6183228269715ed032f44536751, https://git.kernel.org/stable/c/61a348857e869432e6a920ad8ea9132e8d44c316, https://git.kernel.org/stable/c/88936ceab6b426f1312327e9ef849c215c6007a7, https://git.kernel.org/stable/c/c7ebd8149ee519d27232e6e4940e9c02071b568b, https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26715.json, https://nvd.nist.gov/vuln/detail/CVE-2024-26715, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git