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Commit f17c403a authored by Max Kellermann's avatar Max Kellermann Committed by Mauro Carvalho Chehab
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media: dvbdev: add a mutex protecting the "mdev" pointer 



During destruction, a race condition in
dvb_media_controller_disable_source() can cause a kernel crash,
because the "mdev" pointer has been read successfully while another
task executes dvb_usb_media_device_unregister(), which destroys the
object.  Example for such a crash:

    general protection fault: 0000 [#1] SMP
    CPU: 1 PID: 301 Comm: vdr Not tainted 4.8.1-nuc+ #102
    [142B blob data]
    task: ffff8802301f2040 task.stack: ffff880233728000
    RIP: 0010:[<ffffffff816c296b>]  [<ffffffff816c296b>] dvb_frontend_release+0xcb/0x120
    RSP: 0018:ffff88023372bdd8  EFLAGS: 00010202
    RAX: 001fd55c000000da RBX: ffff880236bad810 RCX: 0000000000000000
    RDX: ffff880235bd81f0 RSI: 0000000000000246 RDI: ffff880235bd81e8
    RBP: ffff88023372be00 R08: 0000000000000000 R09: 0000000000000000
    R10: 0000000000000000 R11: ffff88022f009910 R12: 0000000000000000
    R13: ffff880235a21a80 R14: ffff880235bd8000 R15: ffff880235bb8a78
    FS:  0000000000000000(0000) GS:ffff88023fd00000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 00007f96edd69818 CR3: 0000000002406000 CR4: 00000000001006e0
    Stack:
     ffff88022f009900 0000000000000008 ffff880235bb8a78 ffff8802344fbb20
     ffff880236437b40 ffff88023372be48 ffffffff8117a81e ffff880235bb8a78
     ffff88022f009910 ffff8802335a7400 ffff8802301f2040 ffff88022f009900
    Call Trace:
     [<ffffffff8117a81e>] __fput+0xde/0x1d0
     [<ffffffff8117a949>] ____fput+0x9/0x10
     [<ffffffff810a9fce>] task_work_run+0x7e/0xa0
     [<ffffffff81094bab>] do_exit+0x27b/0xa50
     [<ffffffff810407e3>] ? __do_page_fault+0x1c3/0x430
     [<ffffffff81095402>] do_group_exit+0x42/0xb0
     [<ffffffff8109547f>] SyS_exit_group+0xf/0x10
     [<ffffffff8108bedb>] entry_SYSCALL_64_fastpath+0x13/0x8f
    Code: 31 c9 49 8d be e8 01 00 00 ba 01 00 00 00 be 03 00 00 00 e8 68 2d a0 ff 48 8b 83 10 03 00 00 48 8b 80 88 00 00 00 48 85 c0 74 12 <48> 8b 80 88 02 00 00 48 85 c0 74 06 49 8b 7d
    RIP  [<ffffffff816c296b>] dvb_frontend_release+0xcb/0x120

[mchehab+samsung@kernel.org: fix a Coding Style issue]
Signed-off-by: default avatarMax Kellermann <max.kellermann@gmail.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+samsung@kernel.org>
parent 2a5f2705

drivers/media/dvb-core/dvb_frontend.c

+7 −0
Original line number Diff line number Diff line
@@ -2732,6 +2732,7 @@ static int dvb_frontend_open(struct inode *inode, struct file *file) 
		fepriv->voltage = -1;



#ifdef CONFIG_MEDIA_CONTROLLER_DVB

		mutex_lock(&fe->dvb->mdev_lock);

		if (fe->dvb->mdev) {

			mutex_lock(&fe->dvb->mdev->graph_mutex);

			if (fe->dvb->mdev->enable_source)
@@ -2740,11 +2741,13 @@ static int dvb_frontend_open(struct inode *inode, struct file *file) 
							   &fepriv->pipe);

			mutex_unlock(&fe->dvb->mdev->graph_mutex);

			if (ret) {

				mutex_unlock(&fe->dvb->mdev_lock);

				dev_err(fe->dvb->device,

					"Tuner is busy. Error %d\n", ret);

				goto err2;

			}

		}

		mutex_unlock(&fe->dvb->mdev_lock);

#endif

		ret = dvb_frontend_start (fe);

		if (ret)
@@ -2762,12 +2765,14 @@ static int dvb_frontend_open(struct inode *inode, struct file *file) 


err3:

#ifdef CONFIG_MEDIA_CONTROLLER_DVB

	mutex_lock(&fe->dvb->mdev_lock);

	if (fe->dvb->mdev) {

		mutex_lock(&fe->dvb->mdev->graph_mutex);

		if (fe->dvb->mdev->disable_source)

			fe->dvb->mdev->disable_source(dvbdev->entity);

		mutex_unlock(&fe->dvb->mdev->graph_mutex);

	}

	mutex_unlock(&fe->dvb->mdev_lock);

err2:

#endif

	dvb_generic_release(inode, file);
@@ -2799,12 +2804,14 @@ static int dvb_frontend_release(struct inode *inode, struct file *file) 
	if (dvbdev->users == -1) {

		wake_up(&fepriv->wait_queue);

#ifdef CONFIG_MEDIA_CONTROLLER_DVB

		mutex_lock(&fe->dvb->mdev_lock);

		if (fe->dvb->mdev) {

			mutex_lock(&fe->dvb->mdev->graph_mutex);

			if (fe->dvb->mdev->disable_source)

				fe->dvb->mdev->disable_source(dvbdev->entity);

			mutex_unlock(&fe->dvb->mdev->graph_mutex);

		}

		mutex_unlock(&fe->dvb->mdev_lock);

#endif

		if (fe->exit != DVB_FE_NO_EXIT)

			wake_up(&dvbdev->wait_queue);

drivers/media/dvb-core/dvbdev.c

+4 −0
Original line number Diff line number Diff line
@@ -859,6 +859,10 @@ int dvb_register_adapter(struct dvb_adapter *adap, const char *name, 
	adap->mfe_dvbdev = NULL;

	mutex_init (&adap->mfe_lock);



#ifdef CONFIG_MEDIA_CONTROLLER_DVB

	mutex_init(&adap->mdev_lock);

#endif



	list_add_tail (&adap->list_head, &dvb_adapter_list);



	mutex_unlock(&dvbdev_register_lock);

drivers/media/usb/dvb-usb/dvb-usb-dvb.c

+4 −0
Original line number Diff line number Diff line
@@ -132,10 +132,14 @@ static void dvb_usb_media_device_unregister(struct dvb_usb_adapter *adap) 
	if (!adap->dvb_adap.mdev)

		return;



	mutex_lock(&adap->dvb_adap.mdev_lock);



	media_device_unregister(adap->dvb_adap.mdev);

	media_device_cleanup(adap->dvb_adap.mdev);

	kfree(adap->dvb_adap.mdev);

	adap->dvb_adap.mdev = NULL;



	mutex_unlock(&adap->dvb_adap.mdev_lock);

#endif

}

include/media/dvbdev.h

+2 −0
Original line number Diff line number Diff line
@@ -91,6 +91,7 @@ struct dvb_frontend; 
 * @mfe_dvbdev:		Frontend device in use, in the case of MFE

 * @mfe_lock:		Lock to prevent using the other frontends when MFE is

 *			used.

 * @mdev_lock:          Protect access to the mdev pointer.

 * @mdev:		pointer to struct media_device, used when the media

 *			controller is used.

 * @conn:		RF connector. Used only if the device has no separate
@@ -114,6 +115,7 @@ struct dvb_adapter { 
	struct mutex mfe_lock;		/* access lock for thread creation */



#if defined(CONFIG_MEDIA_CONTROLLER_DVB)

	struct mutex mdev_lock;

	struct media_device *mdev;

	struct media_entity *conn;

	struct media_pad *conn_pads;