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

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[ Upstream commit 87c5ff5615 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Chen Yufeng 2025-09-05 17:48:42 +08:00 • committed by Greg Kroah-Hartman

parent 2dc7bcc0b1

commit 0cf9a50af9

1 changed files with 6 additions and 2 deletions

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drivers/usb/cdns3/cdnsp-gadget.c

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