From e93677055a5a3d3055151804db753645ed559cdb Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Stefan=20Br=C3=BCns?= Date: Sat, 19 Jan 2019 20:30:04 -0500 Subject: [PATCH] media: dvbsky: Avoid leaking dvb frontend MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit [ Upstream commit fdfa59cd63b184e1e96d51ff170fcac739bc6f6f ] Commit 14f4eaeddabc ("media: dvbsky: fix driver unregister logic") fixed a use-after-free by removing the reference to the frontend after deleting the backing i2c device. This has the unfortunate side effect the frontend device is never freed in the dvb core leaving a dangling device, leading to errors when the dvb core tries to register the frontend after e.g. a replug as reported here: https://www.spinics.net/lists/linux-media/msg138181.html media: dvbsky: issues with DVBSky T680CI === [ 561.119145] sp2 8-0040: CIMaX SP2 successfully attached [ 561.119161] usb 2-3: DVB: registering adapter 0 frontend 0 (Silicon Labs Si2168)... [ 561.119174] sysfs: cannot create duplicate filename '/class/dvb/ dvb0.frontend0' === The use after free happened as dvb_usbv2_disconnect calls in this order: - dvb_usb_device::props->exit(...) - dvb_usbv2_adapter_frontend_exit(...) + if (fe) dvb_unregister_frontend(fe) + dvb_usb_device::props->frontend_detach(...) Moving the release of the i2c device from exit() to frontend_detach() avoids the dangling pointer access and allows the core to unregister the frontend. This was originally reported for a DVBSky T680CI, but it also affects the MyGica T230C. As all supported devices structure the registration/ unregistration identically, apply the change for all device types. Signed-off-by: Stefan Brüns Signed-off-by: Sean Young Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/usb/dvb-usb-v2/dvbsky.c | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-) diff --git a/drivers/media/usb/dvb-usb-v2/dvbsky.c b/drivers/media/usb/dvb-usb-v2/dvbsky.c index e28bd8836751..ae0814dd202a 100644 --- a/drivers/media/usb/dvb-usb-v2/dvbsky.c +++ b/drivers/media/usb/dvb-usb-v2/dvbsky.c @@ -615,16 +615,18 @@ static int dvbsky_init(struct dvb_usb_device *d) return 0; } -static void dvbsky_exit(struct dvb_usb_device *d) +static int dvbsky_frontend_detach(struct dvb_usb_adapter *adap) { + struct dvb_usb_device *d = adap_to_d(adap); struct dvbsky_state *state = d_to_priv(d); - struct dvb_usb_adapter *adap = &d->adapter[0]; + + dev_dbg(&d->udev->dev, "%s: adap=%d\n", __func__, adap->id); dvb_module_release(state->i2c_client_tuner); dvb_module_release(state->i2c_client_demod); dvb_module_release(state->i2c_client_ci); - adap->fe[0] = NULL; + return 0; } /* DVB USB Driver stuff */ @@ -640,11 +642,11 @@ static struct dvb_usb_device_properties dvbsky_s960_props = { .i2c_algo = &dvbsky_i2c_algo, .frontend_attach = dvbsky_s960_attach, + .frontend_detach = dvbsky_frontend_detach, .init = dvbsky_init, .get_rc_config = dvbsky_get_rc_config, .streaming_ctrl = dvbsky_streaming_ctrl, .identify_state = dvbsky_identify_state, - .exit = dvbsky_exit, .read_mac_address = dvbsky_read_mac_addr, .num_adapters = 1, @@ -667,11 +669,11 @@ static struct dvb_usb_device_properties dvbsky_s960c_props = { .i2c_algo = &dvbsky_i2c_algo, .frontend_attach = dvbsky_s960c_attach, + .frontend_detach = dvbsky_frontend_detach, .init = dvbsky_init, .get_rc_config = dvbsky_get_rc_config, .streaming_ctrl = dvbsky_streaming_ctrl, .identify_state = dvbsky_identify_state, - .exit = dvbsky_exit, .read_mac_address = dvbsky_read_mac_addr, .num_adapters = 1, @@ -694,11 +696,11 @@ static struct dvb_usb_device_properties dvbsky_t680c_props = { .i2c_algo = &dvbsky_i2c_algo, .frontend_attach = dvbsky_t680c_attach, + .frontend_detach = dvbsky_frontend_detach, .init = dvbsky_init, .get_rc_config = dvbsky_get_rc_config, .streaming_ctrl = dvbsky_streaming_ctrl, .identify_state = dvbsky_identify_state, - .exit = dvbsky_exit, .read_mac_address = dvbsky_read_mac_addr, .num_adapters = 1, @@ -721,11 +723,11 @@ static struct dvb_usb_device_properties dvbsky_t330_props = { .i2c_algo = &dvbsky_i2c_algo, .frontend_attach = dvbsky_t330_attach, + .frontend_detach = dvbsky_frontend_detach, .init = dvbsky_init, .get_rc_config = dvbsky_get_rc_config, .streaming_ctrl = dvbsky_streaming_ctrl, .identify_state = dvbsky_identify_state, - .exit = dvbsky_exit, .read_mac_address = dvbsky_read_mac_addr, .num_adapters = 1, @@ -748,11 +750,11 @@ static struct dvb_usb_device_properties mygica_t230c_props = { .i2c_algo = &dvbsky_i2c_algo, .frontend_attach = dvbsky_mygica_t230c_attach, + .frontend_detach = dvbsky_frontend_detach, .init = dvbsky_init, .get_rc_config = dvbsky_get_rc_config, .streaming_ctrl = dvbsky_streaming_ctrl, .identify_state = dvbsky_identify_state, - .exit = dvbsky_exit, .num_adapters = 1, .adapter = { -- GitLab