| Message ID | 20241106-uvc-crashrmmod-v6-1-fbf9781c6e83@chromium.org (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [v6] media: uvcvideo: Fix crash during unbind if gpio unit is in use | expand |
Hi Ricardo, Thank you for the patch. On Wed, Nov 06, 2024 at 08:36:07PM +0000, Ricardo Ribalda wrote: > 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> > --- > Changes in v6: > - Rename cleanup as deinit > - Move cleanup to the beginning of the uvc_unregister_video. > - Fix commit message. > - Link to v5: https://lore.kernel.org/r/20241105-uvc-crashrmmod-v5-1-8623fa51a74f@chromium.org > > Changes in v5: > - Revert non refcount, that belongs to a different set > - Move cleanup to a different function > - Link to v4: https://lore.kernel.org/r/20241105-uvc-crashrmmod-v4-0-410e548f097a@chromium.org > > Changes in v4: Thanks Laurent. > - Remove refcounted cleaup to support devres. > - Link to v3: https://lore.kernel.org/r/20241105-uvc-crashrmmod-v3-1-c0959c8906d3@chromium.org > > Changes in v3: Thanks Sakari. > - Rename variable to initialized. > - Other CodeStyle. > - Link to v2: https://lore.kernel.org/r/20241105-uvc-crashrmmod-v2-1-547ce6a6962e@chromium.org > > Changes in v2: Thanks to Laurent. > - The main structure is not allocated with devres so there is a small > period of time where we can get an irq with the structure free. Do not > use devres for the IRQ. > - Link to v1: https://lore.kernel.org/r/20241031-uvc-crashrmmod-v1-1-059fe593b1e6@chromium.org > --- > drivers/media/usb/uvc/uvc_driver.c | 28 +++++++++++++++++++++------- > drivers/media/usb/uvc/uvcvideo.h | 1 + > 2 files changed, 22 insertions(+), 7 deletions(-) > > diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c > index a96f6ca0889f..cd13bf01265d 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, > @@ -1329,15 +1329,27 @@ 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); > } > > /* ------------------------------------------------------------------------ > @@ -1934,6 +1946,8 @@ 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 07f9921d83f2..965a789ed03e 100644 > --- a/drivers/media/usb/uvc/uvcvideo.h > +++ b/drivers/media/usb/uvc/uvcvideo.h > @@ -234,6 +234,7 @@ struct uvc_entity { > u8 *bmControls; > struct gpio_desc *gpio_privacy; > int irq; > + bool initialized; > } gpio; > }; > > > --- > base-commit: c7ccf3683ac9746b263b0502255f5ce47f64fe0a > change-id: 20241031-uvc-crashrmmod-666de3fc9141
diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c index a96f6ca0889f..cd13bf01265d 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, @@ -1329,15 +1329,27 @@ 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); } /* ------------------------------------------------------------------------ @@ -1934,6 +1946,8 @@ 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 07f9921d83f2..965a789ed03e 100644 --- a/drivers/media/usb/uvc/uvcvideo.h +++ b/drivers/media/usb/uvc/uvcvideo.h @@ -234,6 +234,7 @@ struct uvc_entity { u8 *bmControls; struct gpio_desc *gpio_privacy; int irq; + bool initialized; } gpio; };
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> --- Changes in v6: - Rename cleanup as deinit - Move cleanup to the beginning of the uvc_unregister_video. - Fix commit message. - Link to v5: https://lore.kernel.org/r/20241105-uvc-crashrmmod-v5-1-8623fa51a74f@chromium.org Changes in v5: - Revert non refcount, that belongs to a different set - Move cleanup to a different function - Link to v4: https://lore.kernel.org/r/20241105-uvc-crashrmmod-v4-0-410e548f097a@chromium.org Changes in v4: Thanks Laurent. - Remove refcounted cleaup to support devres. - Link to v3: https://lore.kernel.org/r/20241105-uvc-crashrmmod-v3-1-c0959c8906d3@chromium.org Changes in v3: Thanks Sakari. - Rename variable to initialized. - Other CodeStyle. - Link to v2: https://lore.kernel.org/r/20241105-uvc-crashrmmod-v2-1-547ce6a6962e@chromium.org Changes in v2: Thanks to Laurent. - The main structure is not allocated with devres so there is a small period of time where we can get an irq with the structure free. Do not use devres for the IRQ. - Link to v1: https://lore.kernel.org/r/20241031-uvc-crashrmmod-v1-1-059fe593b1e6@chromium.org --- drivers/media/usb/uvc/uvc_driver.c | 28 +++++++++++++++++++++------- drivers/media/usb/uvc/uvcvideo.h | 1 + 2 files changed, 22 insertions(+), 7 deletions(-) --- base-commit: c7ccf3683ac9746b263b0502255f5ce47f64fe0a change-id: 20241031-uvc-crashrmmod-666de3fc9141 Best regards,