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Wed, 10 Jun 2026 05:10:29 -0700 (PDT) From: Ruoyu Wang To: Neal Liu , Greg Kroah-Hartman Cc: Joel Stanley , Andrew Jeffery , linux-aspeed@lists.ozlabs.org, linux-usb@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Ruoyu Wang Subject: [PATCH v2] usb: gadget: aspeed_udc: check endpoint DMA allocation Date: Wed, 10 Jun 2026 20:10:22 +0800 Message-ID: <20260610121022.3-1-ruoyuw560@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260608081948.3-1-ruoyuw560@gmail.com> References: <20260608081948.3-1-ruoyuw560@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit ast_udc_probe() allocates a coherent DMA buffer used as the backing store for endpoint buffers. ast_udc_init_ep() derives per-endpoint buffer pointers from udc->ep0_buf, so a failed allocation is dereferenced during probe. Check the allocation before endpoint setup. The existing probe error path called ast_udc_remove(), which unregisters the gadget unconditionally and is not safe before usb_add_gadget_udc() succeeds. Add a local cleanup helper for probe failures so pre-registration failures only unwind the resources that were actually initialized. This was found by a local static analysis checker for unchecked allocator returns while scanning Linux 6.16. The change was checked by applying it to current mainline and by running checkpatch. I do not have access to Aspeed UDC hardware, so no runtime testing was performed. Fixes: 055276c13205 ("usb: gadget: add Aspeed ast2600 udc driver") Signed-off-by: Ruoyu Wang --- Note: a 2022 patch attempted to add only a NULL check for this allocation: https://lore.kernel.org/all/20221213025120.23149-1-jiasheng@iscas.ac.cn/ This version also fixes the probe unwind path so the clock is disabled on allocation failure and usb_del_gadget_udc() is not called before the gadget has been registered. v1: https://lore.kernel.org/all/20260608081948.3-1-ruoyuw560@gmail.com/ Changes in v2: - Simplify the allocation-failure cleanup path as suggested by Andrew Jeffery: disable the clock in the allocation-failure branch and let err_cleanup fall through to err. diff --git a/drivers/usb/gadget/udc/aspeed_udc.c b/drivers/usb/gadget/udc/aspeed_udc.c --- a/drivers/usb/gadget/udc/aspeed_udc.c +++ b/drivers/usb/gadget/udc/aspeed_udc.c @@ -1434,25 +1434,12 @@ static void ast_udc_init_hw(struct ast_u ast_udc_write(udc, 0, AST_UDC_EP0_CTRL); } -static void ast_udc_remove(struct platform_device *pdev) +static void ast_udc_cleanup(struct platform_device *pdev) { struct ast_udc_dev *udc = platform_get_drvdata(pdev); unsigned long flags; u32 ctrl; - usb_del_gadget_udc(&udc->gadget); - if (udc->driver) { - /* - * This is broken as only some cleanup is skipped, *udev is - * freed and the register mapping goes away. Any further usage - * probably crashes. Also the device is unbound, so the skipped - * cleanup is never catched up later. - */ - dev_alert(&pdev->dev, - "Driver is busy and still going away. Fasten your seat belts!\n"); - return; - } - spin_lock_irqsave(&udc->lock, flags); /* Disable upstream port connection */ @@ -1472,6 +1459,26 @@ static void ast_udc_remove(struct platfo udc->ep0_buf = NULL; } +static void ast_udc_remove(struct platform_device *pdev) +{ + struct ast_udc_dev *udc = platform_get_drvdata(pdev); + + usb_del_gadget_udc(&udc->gadget); + if (udc->driver) { + /* + * This is broken as only some cleanup is skipped, *udev is + * freed and the register mapping goes away. Any further usage + * probably crashes. Also the device is unbound, so the skipped + * cleanup is never catched up later. + */ + dev_alert(&pdev->dev, + "Driver is busy and still going away. Fasten your seat belts!\n"); + return; + } + + ast_udc_cleanup(pdev); +} + static int ast_udc_probe(struct platform_device *pdev) { enum usb_device_speed max_speed; @@ -1524,6 +1531,12 @@ static int ast_udc_probe(struct platform AST_UDC_NUM_ENDPOINTS, &udc->ep0_buf_dma, GFP_KERNEL); + if (!udc->ep0_buf) { + clk_disable_unprepare(udc->clk); + rc = -ENOMEM; + goto err; + } + udc->gadget.speed = USB_SPEED_UNKNOWN; udc->gadget.max_speed = USB_SPEED_HIGH; udc->creq = udc->reg + AST_UDC_SETUP0; @@ -1553,20 +1566,20 @@ static int ast_udc_probe(struct platform udc->irq = platform_get_irq(pdev, 0); if (udc->irq < 0) { rc = udc->irq; - goto err; + goto err_cleanup; } rc = devm_request_irq(&pdev->dev, udc->irq, ast_udc_isr, 0, KBUILD_MODNAME, udc); if (rc) { dev_err(&pdev->dev, "Failed to request interrupt\n"); - goto err; + goto err_cleanup; } rc = usb_add_gadget_udc(&pdev->dev, &udc->gadget); if (rc) { dev_err(&pdev->dev, "Failed to add gadget udc\n"); - goto err; + goto err_cleanup; } dev_info(&pdev->dev, "Initialized udc in USB%s mode\n", @@ -1574,9 +1587,10 @@ static int ast_udc_probe(struct platform return 0; +err_cleanup: + ast_udc_cleanup(pdev); err: dev_err(&pdev->dev, "Failed to udc probe, rc:0x%x\n", rc); - ast_udc_remove(pdev); return rc; }