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| author | Max Kellermann <max.kellermann@gmail.com> | 2016-08-09 18:33:03 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2016-11-18 15:29:27 -0200 |
| commit | e7cd17a29d72868aa5cfbbd4de7c54a28ed30ff0 (patch) | |
| tree | 29b9bdca185608f2d8f29879fc4c0efeeb6c56fc /drivers/media | |
| parent | 6753743e11540b7fc54d03771458e2bd91ba411b (diff) | |
| download | linux-e7cd17a29d72868aa5cfbbd4de7c54a28ed30ff0.tar.gz linux-e7cd17a29d72868aa5cfbbd4de7c54a28ed30ff0.tar.bz2 linux-e7cd17a29d72868aa5cfbbd4de7c54a28ed30ff0.zip | |
[media] drivers/media/media-device: fix double free bug in _unregister()
While removing all interfaces in media_device_unregister(), all
media_interface pointers are freed. This is illegal and results in
double kfree() if any media_interface is still linked at this point;
maybe because a userspace process still has a file handle. Once the
process closes the file handle, dvb_media_device_free() gets called,
which frees the dvb_device.intf_devnode again.
This patch removes the unnecessary kfree() call, and documents who's
responsible for really freeing it.
Signed-off-by: Max Kellermann <max.kellermann@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/media-device.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c index 2783531f9fc0..219ab5fc8b4c 100644 --- a/drivers/media/media-device.c +++ b/drivers/media/media-device.c @@ -801,9 +801,13 @@ void media_device_unregister(struct media_device *mdev) /* Remove all interfaces from the media device */ list_for_each_entry_safe(intf, tmp_intf, &mdev->interfaces, graph_obj.list) { + /* + * Unlink the interface, but don't free it here; the + * module which created it is responsible for freeing + * it + */ __media_remove_intf_links(intf); media_gobj_destroy(&intf->graph_obj); - kfree(intf); } mutex_unlock(&mdev->graph_mutex); |