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.
We cannot use the function devm_request_threaded_irq here. The devm_* clean functions may be called after the main structure is released by uvc_delete.
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@vger.kernel.org Fixes: 2886477ff987 ("media: uvcvideo: Implement UVC_EXT_GPIO_UNIT") Reviewed-by: Sergey Senozhatsky senozhatsky@chromium.org Signed-off-by: Ricardo Ribalda ribalda@chromium.org Reviewed-by: Laurent Pinchart laurent.pinchart@ideasonboard.com Link: https://lore.kernel.org/r/20241106-uvc-crashrmmod-v6-1-fbf9781c6e83@chromium... Signed-off-by: Laurent Pinchart laurent.pinchart@ideasonboard.com Signed-off-by: Mauro Carvalho Chehab mchehab+huawei@kernel.org (cherry picked from commit a9ea1a3d88b7947ce8cadb2afceee7a54872bbc5) --- drivers/media/usb/uvc/uvc_driver.c | 35 ++++++++++++++++++++---------- drivers/media/usb/uvc/uvcvideo.h | 1 + 2 files changed, 24 insertions(+), 12 deletions(-)
diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c index 1942b9e210cc..c4b272c7aacc 100644 --- a/drivers/media/usb/uvc/uvc_driver.c +++ b/drivers/media/usb/uvc/uvc_driver.c @@ -1530,18 +1530,15 @@ 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) { - if (irq != EPROBE_DEFER) - dev_err(&dev->udev->dev, - "No IRQ for privacy GPIO (%d)\n", irq); - return irq; - } + if (irq < 0) + return dev_err_probe(&dev->intf->dev, irq, + "No IRQ for privacy GPIO\n");
unit = uvc_alloc_new_entity(dev, UVC_EXT_GPIO_UNIT, UVC_EXT_GPIO_UNIT_ID, 0, 1); @@ -1567,15 +1564,27 @@ static int uvc_gpio_parse(struct uvc_device *dev) static int uvc_gpio_init_irq(struct uvc_device *dev) { struct uvc_entity *unit = dev->gpio_unit; + int ret;
if (!unit || unit->gpio.irq < 0) return 0;
- return devm_request_threaded_irq(&dev->udev->dev, unit->gpio.irq, NULL, - uvc_gpio_irq, - IRQF_ONESHOT | IRQF_TRIGGER_FALLING | - IRQF_TRIGGER_RISING, - "uvc_privacy_gpio", dev); + ret = request_threaded_irq(unit->gpio.irq, NULL, uvc_gpio_irq, + IRQF_ONESHOT | IRQF_TRIGGER_FALLING | + IRQF_TRIGGER_RISING, + "uvc_privacy_gpio", dev); + + unit->gpio.initialized = !ret; + + return ret; +} + +static void uvc_gpio_deinit(struct uvc_device *dev) +{ + if (!dev->gpio_unit || !dev->gpio_unit->gpio.initialized) + return; + + free_irq(dev->gpio_unit->gpio.irq, dev); }
/* ------------------------------------------------------------------------ @@ -2168,6 +2177,8 @@ static void uvc_unregister_video(struct uvc_device *dev) { struct uvc_streaming *stream;
+ uvc_gpio_deinit(dev); + list_for_each_entry(stream, &dev->streams, list) { /* Nothing to do here, continue. */ if (!video_is_registered(&stream->vdev)) diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h index 1aa2cc98502d..f7fc620c790a 100644 --- a/drivers/media/usb/uvc/uvcvideo.h +++ b/drivers/media/usb/uvc/uvcvideo.h @@ -368,6 +368,7 @@ struct uvc_entity { u8 *bmControls; struct gpio_desc *gpio_privacy; int irq; + bool initialized; } gpio; };