[PATCH 1/5] usb: gadget: lpc32xx_udc: fix clock imbalance in error path

[PATCH 1/5] usb: gadget: lpc32xx_udc: fix clock imbalance in error path

[Johan Hovold]

A recent change fixing a device reference leak introduced a clock
imbalance by reusing an error path so that the clock may be disabled
before having been enabled.

Note that the clock framework allows for passing in NULL clocks so there
is no risk for a NULL pointer dereference.

Also drop the bogus I2C client NULL check added by the offending commit
as the pointer has already been verified to be non-NULL.

Fixes: c84117912bdd ("USB: lpc32xx_udc: Fix error handling in probe")
Cc: stable@vger.kernel.org
Cc: Ma Ke <make24@iscas.ac.cn>
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/usb/gadget/udc/lpc32xx_udc.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/usb/gadget/udc/lpc32xx_udc.c b/drivers/usb/gadget/udc/lpc32xx_udc.c
index 73c0f28a8585..a962d4294fbe 100644
--- a/drivers/usb/gadget/udc/lpc32xx_udc.c
+++ b/drivers/usb/gadget/udc/lpc32xx_udc.c
@@ -3020,7 +3020,7 @@ static int lpc32xx_udc_probe(struct platform_device *pdev)
 	pdev->dev.dma_mask = &lpc32xx_usbd_dmamask;
 	retval = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 	if (retval)
-		goto i2c_fail;
+		goto err_put_client;
 
 	udc->board = &lpc32xx_usbddata;
 
@@ -3040,7 +3040,7 @@ static int lpc32xx_udc_probe(struct platform_device *pdev)
 		udc->udp_irq[i] = platform_get_irq(pdev, i);
 		if (udc->udp_irq[i] < 0) {
 			retval = udc->udp_irq[i];
-			goto i2c_fail;
+			goto err_put_client;
 		}
 	}
 
@@ -3048,7 +3048,7 @@ static int lpc32xx_udc_probe(struct platform_device *pdev)
 	if (IS_ERR(udc->udp_baseaddr)) {
 		dev_err(udc->dev, "IO map failure\n");
 		retval = PTR_ERR(udc->udp_baseaddr);
-		goto i2c_fail;
+		goto err_put_client;
 	}
 
 	/* Get USB device clock */
@@ -3056,14 +3056,14 @@ static int lpc32xx_udc_probe(struct platform_device *pdev)
 	if (IS_ERR(udc->usb_slv_clk)) {
 		dev_err(udc->dev, "failed to acquire USB device clock\n");
 		retval = PTR_ERR(udc->usb_slv_clk);
-		goto i2c_fail;
+		goto err_put_client;
 	}
 
 	/* Enable USB device clock */
 	retval = clk_prepare_enable(udc->usb_slv_clk);
 	if (retval < 0) {
 		dev_err(udc->dev, "failed to start USB device clock\n");
-		goto i2c_fail;
+		goto err_put_client;
 	}
 
 	/* Setup deferred workqueue data */
@@ -3165,9 +3165,10 @@ static int lpc32xx_udc_probe(struct platform_device *pdev)
 	dma_free_coherent(&pdev->dev, UDCA_BUFF_SIZE,
 			  udc->udca_v_base, udc->udca_p_base);
 i2c_fail:
-	if (udc->isp1301_i2c_client)
-		put_device(&udc->isp1301_i2c_client->dev);
 	clk_disable_unprepare(udc->usb_slv_clk);
+err_put_client:
+	put_device(&udc->isp1301_i2c_client->dev);
+
 	dev_err(udc->dev, "%s probe failed, %d\n", driver_name, retval);
 
 	return retval;
@@ -3195,10 +3196,9 @@ static void lpc32xx_udc_remove(struct platform_device *pdev)
 	dma_free_coherent(&pdev->dev, UDCA_BUFF_SIZE,
 			  udc->udca_v_base, udc->udca_p_base);
 
-	if (udc->isp1301_i2c_client)
-		put_device(&udc->isp1301_i2c_client->dev);
-
 	clk_disable_unprepare(udc->usb_slv_clk);
+
+	put_device(&udc->isp1301_i2c_client->dev);
 }
 
 #ifdef CONFIG_PM
-- 
2.51.2

[PATCH 2/5] usb: phy: isp1301: fix non-OF device reference imbalance

[Johan Hovold]

A recent change fixing a device reference leak in a UDC driver
introduced a potential use-after-free in the non-OF case as the
isp1301_get_client() helper only increases the reference count for the
returned I2C device in the OF case.

Increment the reference count also for non-OF so that the caller can
decrement it unconditionally.

Note that this is inherently racy just as using the returned I2C device
is since nothing is preventing the PHY driver from being unbound while
in use.

Fixes: c84117912bdd ("USB: lpc32xx_udc: Fix error handling in probe")
Cc: stable@vger.kernel.org
Cc: Ma Ke <make24@iscas.ac.cn>
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/usb/phy/phy-isp1301.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/phy/phy-isp1301.c b/drivers/usb/phy/phy-isp1301.c
index f9b5c411aee4..2940f0c84e1b 100644
--- a/drivers/usb/phy/phy-isp1301.c
+++ b/drivers/usb/phy/phy-isp1301.c
@@ -149,7 +149,12 @@ struct i2c_client *isp1301_get_client(struct device_node *node)
 		return client;
 
 	/* non-DT: only one ISP1301 chip supported */
-	return isp1301_i2c_client;
+	if (isp1301_i2c_client) {
+		get_device(&isp1301_i2c_client->dev);
+		return isp1301_i2c_client;
+	}
+
+	return NULL;
 }
 EXPORT_SYMBOL_GPL(isp1301_get_client);
 
-- 
2.51.2

[PATCH 3/5] usb: ohci-nxp: fix device leak on probe failure

[Johan Hovold]

Make sure to drop the reference taken when looking up the PHY I2C device
during probe on probe failure (e.g. probe deferral) and on driver
unbind.

Fixes: 73108aa90cbf ("USB: ohci-nxp: Use isp1301 driver")
Cc: stable@vger.kernel.org	# 3.5
Reported-by: Ma Ke <make24@iscas.ac.cn>
Link: https://lore.kernel.org/lkml/20251117013428.21840-1-make24@iscas.ac.cn/
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/usb/host/ohci-nxp.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/host/ohci-nxp.c b/drivers/usb/host/ohci-nxp.c
index 24d5a1dc5056..9a05828bbba1 100644
--- a/drivers/usb/host/ohci-nxp.c
+++ b/drivers/usb/host/ohci-nxp.c
@@ -169,13 +169,13 @@ static int ohci_hcd_nxp_probe(struct platform_device *pdev)
 
 	ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 	if (ret)
-		goto fail_disable;
+		goto err_put_client;
 
 	dev_dbg(&pdev->dev, "%s: " DRIVER_DESC " (nxp)\n", hcd_name);
 	if (usb_disabled()) {
 		dev_err(&pdev->dev, "USB is disabled\n");
 		ret = -ENODEV;
-		goto fail_disable;
+		goto err_put_client;
 	}
 
 	/* Enable USB host clock */
@@ -183,7 +183,7 @@ static int ohci_hcd_nxp_probe(struct platform_device *pdev)
 	if (IS_ERR(usb_host_clk)) {
 		dev_err(&pdev->dev, "failed to acquire and start USB OHCI clock\n");
 		ret = PTR_ERR(usb_host_clk);
-		goto fail_disable;
+		goto err_put_client;
 	}
 
 	isp1301_configure();
@@ -192,7 +192,7 @@ static int ohci_hcd_nxp_probe(struct platform_device *pdev)
 	if (!hcd) {
 		dev_err(&pdev->dev, "Failed to allocate HC buffer\n");
 		ret = -ENOMEM;
-		goto fail_disable;
+		goto err_put_client;
 	}
 
 	hcd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
@@ -222,7 +222,8 @@ static int ohci_hcd_nxp_probe(struct platform_device *pdev)
 	ohci_nxp_stop_hc();
 fail_resource:
 	usb_put_hcd(hcd);
-fail_disable:
+err_put_client:
+	put_device(&isp1301_i2c_client->dev);
 	isp1301_i2c_client = NULL;
 	return ret;
 }
@@ -234,6 +235,7 @@ static void ohci_hcd_nxp_remove(struct platform_device *pdev)
 	usb_remove_hcd(hcd);
 	ohci_nxp_stop_hc();
 	usb_put_hcd(hcd);
+	put_device(&isp1301_i2c_client->dev);
 	isp1301_i2c_client = NULL;
 }
 
-- 
2.51.2