Description

In the Linux kernel, the following vulnerability has been resolved: usb: cdns3: gadget: Use-after-free during failed initialization and exit of cdnsp gadget In the __cdnsp_gadget_init() and cdnsp_gadget_exit() functions, the gadget structure (pdev->gadget) was freed before its endpoints. The endpoints are linked via the ep_list in the gadget structure. Freeing the gadget first leaves dangling pointers in the endpoint list. When the endpoints are subsequently freed, this results in a use-after-free. Fix: By separating the usb_del_gadget_udc() operation into distinct "del" and "put" steps, cdnsp_gadget_free_endpoints() can be executed prior to the final release of the gadget structure with usb_put_gadget(). A patch similar to bb9c74a5bd14("usb: dwc3: gadget: Free gadget structure only after freeing endpoints").

References 6

• git.kernel.org https://git.kernel.org/stable/c/0cf9a50af91fbdac3849f8d950e883a3eaa3ecea
• git.kernel.org https://git.kernel.org/stable/c/37158ce6ba964b62d1e3eebd11f03c6900a52dd1
• git.kernel.org https://git.kernel.org/stable/c/87c5ff5615dc0a37167e8faf3adeeddc6f1344a3
• git.kernel.org https://git.kernel.org/stable/c/9c52f01429c377a2d32cafc977465f37b5384f77
• git.kernel.org https://git.kernel.org/stable/c/ea37884097a0931abb8e11e40eacfb25e9fdb5e9
• git.kernel.org https://git.kernel.org/stable/c/fdf573c517627a96f5040f988e9b21267806be5c

Remediation