linux-kernel - [PATCH] media: uvcvideo: Fix crash during unbind if gpio unit is in use

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Message-Id: <20241031-uvc-crashrmmod-v1-1-059fe593b1e6@chromium.org>
Date: Thu, 31 Oct 2024 13:59:08 +0000
From: Ricardo Ribalda <ribalda@...omium.org>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: Hans Verkuil <hverkuil@...all.nl>, linux-media@...r.kernel.org, 
 linux-kernel@...r.kernel.org, stable@...r.kernel.org, 
 Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH] media: uvcvideo: Fix crash during unbind if gpio unit is
 in use

We used the wrong device for the device managed functions. We used the
usb device, when we should be using the interface device.

If we unbind the driver from the usb interface, the cleanup functions
are never called. In our case, the IRQ is never disabled.

If an IRQ is triggered, it will try to access memory sections that are
already free, causing an OOPS.

Luckily this bug has small impact, as it is only affected by devices
with gpio units and the user has to unbind the device, a disconnect will
not trigger this error.

Cc: stable@...r.kernel.org
Fixes: 2886477ff987 ("media: uvcvideo: Implement UVC_EXT_GPIO_UNIT")
Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/media/usb/uvc/uvc_driver.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index a96f6ca0889f..1100d3ed342e 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -1295,14 +1295,14 @@ static int uvc_gpio_parse(struct uvc_device *dev)
 	struct gpio_desc *gpio_privacy;
 	int irq;
 
-	gpio_privacy = devm_gpiod_get_optional(&dev->udev->dev, "privacy",
+	gpio_privacy = devm_gpiod_get_optional(&dev->intf->dev, "privacy",
 					       GPIOD_IN);
 	if (IS_ERR_OR_NULL(gpio_privacy))
 		return PTR_ERR_OR_ZERO(gpio_privacy);
 
 	irq = gpiod_to_irq(gpio_privacy);
 	if (irq < 0)
-		return dev_err_probe(&dev->udev->dev, irq,
+		return dev_err_probe(&dev->intf->dev, irq,
 				     "No IRQ for privacy GPIO\n");
 
 	unit = uvc_alloc_new_entity(dev, UVC_EXT_GPIO_UNIT,
@@ -1333,7 +1333,7 @@ static int uvc_gpio_init_irq(struct uvc_device *dev)
 	if (!unit || unit->gpio.irq < 0)
 		return 0;
 
-	return devm_request_threaded_irq(&dev->udev->dev, unit->gpio.irq, NULL,
+	return devm_request_threaded_irq(&dev->intf->dev, unit->gpio.irq, NULL,
 					 uvc_gpio_irq,
 					 IRQF_ONESHOT | IRQF_TRIGGER_FALLING |
 					 IRQF_TRIGGER_RISING,

---
base-commit: c7ccf3683ac9746b263b0502255f5ce47f64fe0a
change-id: 20241031-uvc-crashrmmod-666de3fc9141

Best regards,
-- 
Ricardo Ribalda <ribalda@...omium.org>