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usb: cdns3: gadget: Use-after-free during failed initialization and exit of cdnsp gadget

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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").

Signed-off-by: Chen Yufeng <chenyufeng@iie.ac.cn>
Link: https://lore.kernel.org/r/20250905094842.1232-1-chenyufeng@iie.ac.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chen Yufeng
2025-09-05 17:48:42 +08:00
committed by Greg Kroah-Hartman
parent e9c206324e
commit 87c5ff5615
1 changed files with 6 additions and 2 deletions
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8
drivers/usb/cdns3/cdnsp-gadget.c
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@@ -1976,7 +1976,10 @@ static int __cdnsp_gadget_init(struct cdns *cdns)
return 0;
del_gadget:
usb_del_gadget_udc(&pdev->gadget);
usb_del_gadget(&pdev->gadget);
cdnsp_gadget_free_endpoints(pdev);
usb_put_gadget(&pdev->gadget);
goto halt_pdev;
free_endpoints:
cdnsp_gadget_free_endpoints(pdev);
halt_pdev:
@@ -1998,8 +2001,9 @@ static void cdnsp_gadget_exit(struct cdns *cdns)
devm_free_irq(pdev->dev, cdns->dev_irq, pdev);
pm_runtime_mark_last_busy(cdns->dev);
pm_runtime_put_autosuspend(cdns->dev);
usb_del_gadget_udc(&pdev->gadget);
usb_del_gadget(&pdev->gadget);
cdnsp_gadget_free_endpoints(pdev);
usb_put_gadget(&pdev->gadget);
cdnsp_mem_cleanup(pdev);
kfree(pdev);
cdns->gadget_dev = NULL;