Re: [PATCH 3/4] media: davinci: vpif: fix use-after-free on driver unbind

Hi Johan,

Thank you for the patch.

On Wed, Dec 22, 2021 at 2:20 PM Johan Hovold johan@kernel.org wrote:

The driver allocates and registers two platform device structures during probe, but the devices were never deregistered on driver unbind.

This results in a use-after-free on driver unbind as the device structures were allocated using devres and would be freed by driver core when remove() returns.

Fix this by adding the missing deregistration calls to the remove() callback and failing probe on registration errors.

Note that the platform device structures must be freed using a proper release callback to avoid leaking associated resources like device names.

Fixes: 479f7a118105 ("[media] davinci: vpif: adaptions for DT support") Cc: stable@vger.kernel.org # 4.12 Cc: Kevin Hilman khilman@baylibre.com Signed-off-by: Johan Hovold johan@kernel.org

---

drivers/media/platform/davinci/vpif.c | 97 ++++++++++++++++++++------- 1 file changed, 71 insertions(+), 26 deletions(-)

Reviewed-by: Lad Prabhakar prabhakar.csengg@gmail.com

Cheers, Prabhakar

diff --git a/drivers/media/platform/davinci/vpif.c b/drivers/media/platform/davinci/vpif.c index 1f5eacf48580..4a260f4ed236 100644 --- a/drivers/media/platform/davinci/vpif.c +++ b/drivers/media/platform/davinci/vpif.c @@ -41,6 +41,11 @@ MODULE_ALIAS("platform:" VPIF_DRIVER_NAME); #define VPIF_CH2_MAX_MODES 15 #define VPIF_CH3_MAX_MODES 2

+struct vpif_data {

•   struct platform_device *capture;
  

•   struct platform_device *display;
  

+};

DEFINE_SPINLOCK(vpif_lock); EXPORT_SYMBOL_GPL(vpif_lock);

@@ -423,17 +428,31 @@ int vpif_channel_getfid(u8 channel_id) } EXPORT_SYMBOL(vpif_channel_getfid);

+static void vpif_pdev_release(struct device *dev) +{

•   struct platform_device *pdev = to_platform_device(dev);
  

•   kfree(pdev);
  

+}

static int vpif_probe(struct platform_device *pdev) { static struct resource *res_irq; struct platform_device *pdev_capture, *pdev_display; struct device_node *endpoint = NULL;

•   struct vpif_data *data;
    int ret;
  
    vpif_base = devm_platform_ioremap_resource(pdev, 0);
    if (IS_ERR(vpif_base))
            return PTR_ERR(vpif_base);
  
  

•   data = kzalloc(sizeof(*data), GFP_KERNEL);
  

•   if (!data)
  

•           return -ENOMEM;
  

•   platform_set_drvdata(pdev, data);
  

•   pm_runtime_enable(&pdev->dev);
    pm_runtime_get(&pdev->dev);
  
  

@@ -461,49 +480,75 @@ static int vpif_probe(struct platform_device *pdev) goto err_put_rpm; }

•   pdev_capture = devm_kzalloc(&pdev->dev, sizeof(*pdev_capture),
  

•                               GFP_KERNEL);
  

•   if (pdev_capture) {
  

•           pdev_capture->name = "vpif_capture";
  

•           pdev_capture->id = -1;
  

•           pdev_capture->resource = res_irq;
  

•           pdev_capture->num_resources = 1;
  

•           pdev_capture->dev.dma_mask = pdev->dev.dma_mask;
  

•           pdev_capture->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
  

•           pdev_capture->dev.parent = &pdev->dev;
  

•           platform_device_register(pdev_capture);
  

•   } else {
  

•           dev_warn(&pdev->dev, "Unable to allocate memory for pdev_capture.\n");
  

•   pdev_capture = kzalloc(sizeof(*pdev_capture), GFP_KERNEL);
  

•   if (!pdev_capture) {
  

•           ret = -ENOMEM;
  

•           goto err_put_rpm;
    }
  
  

•   pdev_display = devm_kzalloc(&pdev->dev, sizeof(*pdev_display),
  

•                               GFP_KERNEL);
  

•   if (pdev_display) {
  

•           pdev_display->name = "vpif_display";
  

•           pdev_display->id = -1;
  

•           pdev_display->resource = res_irq;
  

•           pdev_display->num_resources = 1;
  

•           pdev_display->dev.dma_mask = pdev->dev.dma_mask;
  

•           pdev_display->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
  

•           pdev_display->dev.parent = &pdev->dev;
  

•           platform_device_register(pdev_display);
  

•   } else {
  

•           dev_warn(&pdev->dev, "Unable to allocate memory for pdev_display.\n");
  

•   pdev_capture->name = "vpif_capture";
  

•   pdev_capture->id = -1;
  

•   pdev_capture->resource = res_irq;
  

•   pdev_capture->num_resources = 1;
  

•   pdev_capture->dev.dma_mask = pdev->dev.dma_mask;
  

•   pdev_capture->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
  

•   pdev_capture->dev.parent = &pdev->dev;
  

•   pdev_capture->dev.release = vpif_pdev_release;
  

•   ret = platform_device_register(pdev_capture);
  

•   if (ret)
  

•           goto err_put_pdev_capture;
  

•   pdev_display = kzalloc(sizeof(*pdev_display), GFP_KERNEL);
  

•   if (!pdev_display) {
  

•           ret = -ENOMEM;
  

•           goto err_put_pdev_capture;
    }
  
  

•   pdev_display->name = "vpif_display";
  

•   pdev_display->id = -1;
  

•   pdev_display->resource = res_irq;
  

•   pdev_display->num_resources = 1;
  

•   pdev_display->dev.dma_mask = pdev->dev.dma_mask;
  

•   pdev_display->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
  

•   pdev_display->dev.parent = &pdev->dev;
  

•   pdev_display->dev.release = vpif_pdev_release;
  

•   ret = platform_device_register(pdev_display);
  

•   if (ret)
  

•           goto err_put_pdev_display;
  

•   data->capture = pdev_capture;
  

•   data->display = pdev_display;
  

•   return 0;
  
  

+err_put_pdev_display:

•   platform_device_put(pdev_display);
  

+err_put_pdev_capture:

•   platform_device_put(pdev_capture);
  

err_put_rpm: pm_runtime_put(&pdev->dev); pm_runtime_disable(&pdev->dev);

•   kfree(data);
  
    return ret;
  

}

static int vpif_remove(struct platform_device *pdev) {

•   struct vpif_data *data = platform_get_drvdata(pdev);
  

•   if (data->capture)
  

•           platform_device_unregister(data->capture);
  

•   if (data->display)
  

•           platform_device_unregister(data->display);
  

•   pm_runtime_put(&pdev->dev);
    pm_runtime_disable(&pdev->dev);
  

•   kfree(data);
  

•   return 0;
  

}

-- 2.32.0