[media] s5p-jpeg: Eliminate double kfree()

video_unregister_device() calls device_unregister(), which calls
put_device(), which calls kobject_put(), and if this is the last reference
then kobject_release() is called, which calls kobject_cleanup(), which
calls ktype's release method which happens to be device_release() in this
case, which calls dev->release(), which happens to be
v4l2_device_release() in this case, which calls vdev->release(), which
happens to be video_device_release(). But video_device_release() is
called explicitly both in error recovery path of s5p_jpeg_probe() and
in s5p_jpeg_remove(). The pointers in question are not nullified between
the two calls, so this is harmful.

This patch fixes the driver so that video_device_release() is not called
twice for the same object.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --git a/drivers/media/platform/s5p-jpeg/jpeg-core.c b/drivers/media/platform/s5p-jpeg/jpeg-core.c
index bfbf157..9690f9d 100644 (file)
--- a/drivers/media/platform/s5p-jpeg/jpeg-core.c
+++ b/drivers/media/platform/s5p-jpeg/jpeg-core.c
@@ -2544,7 +2544,8 @@ static int s5p_jpeg_probe(struct platform_device *pdev)
        ret = video_register_device(jpeg->vfd_encoder, VFL_TYPE_GRABBER, -1);
        if (ret) {
                v4l2_err(&jpeg->v4l2_dev, "Failed to register video device\n");
-               goto enc_vdev_alloc_rollback;
+               video_device_release(jpeg->vfd_encoder);
+               goto vb2_allocator_rollback;
        }
 
        video_set_drvdata(jpeg->vfd_encoder, jpeg);
@@ -2572,7 +2573,8 @@ static int s5p_jpeg_probe(struct platform_device *pdev)
        ret = video_register_device(jpeg->vfd_decoder, VFL_TYPE_GRABBER, -1);
        if (ret) {
                v4l2_err(&jpeg->v4l2_dev, "Failed to register video device\n");
-               goto dec_vdev_alloc_rollback;
+               video_device_release(jpeg->vfd_decoder);
+               goto enc_vdev_register_rollback;
        }
 
        video_set_drvdata(jpeg->vfd_decoder, jpeg);
@@ -2589,15 +2591,9 @@ static int s5p_jpeg_probe(struct platform_device *pdev)
 
        return 0;
 
-dec_vdev_alloc_rollback:
-       video_device_release(jpeg->vfd_decoder);
-
 enc_vdev_register_rollback:
        video_unregister_device(jpeg->vfd_encoder);
 
-enc_vdev_alloc_rollback:
-       video_device_release(jpeg->vfd_encoder);
-
 vb2_allocator_rollback:
        vb2_dma_contig_cleanup_ctx(jpeg->alloc_ctx);
 
@@ -2622,9 +2618,7 @@ static int s5p_jpeg_remove(struct platform_device *pdev)
        pm_runtime_disable(jpeg->dev);
 
        video_unregister_device(jpeg->vfd_decoder);
-       video_device_release(jpeg->vfd_decoder);
        video_unregister_device(jpeg->vfd_encoder);
-       video_device_release(jpeg->vfd_encoder);
        vb2_dma_contig_cleanup_ctx(jpeg->alloc_ctx);
        v4l2_m2m_release(jpeg->m2m_dev);
        v4l2_device_unregister(&jpeg->v4l2_dev);