@@ -23,11 +23,40 @@ static int dvb_usb_force_pid_filter_usage;
module_param_named(force_pid_filter_usage, dvb_usb_force_pid_filter_usage, int, 0444);
MODULE_PARM_DESC(force_pid_filter_usage, "force all dvb-usb-devices to use a PID filter, if any (default: 0).");
+static int dvb_usb_check_bulk_endpoint(struct dvb_usb_device *d, u8 endpoint)
+{
+ if (endpoint) {
+ int ret;
+
+ ret = usb_pipe_type_check(d->udev, usb_sndbulkpipe(d->udev, endpoint));
+ if (ret)
+ return ret;
+ ret = usb_pipe_type_check(d->udev, usb_rcvbulkpipe(d->udev, endpoint));
+ if (ret)
+ return ret;
+ }
+ return 0;
+}
+
+static void dvb_usb_clear_halt(struct dvb_usb_device *d, u8 endpoint)
+{
+ if (endpoint) {
+ usb_clear_halt(d->udev, usb_sndbulkpipe(d->udev, endpoint));
+ usb_clear_halt(d->udev, usb_rcvbulkpipe(d->udev, endpoint));
+ }
+}
+
static int dvb_usb_adapter_init(struct dvb_usb_device *d, short *adapter_nrs)
{
struct dvb_usb_adapter *adap;
int ret, n, o;
+ ret = dvb_usb_check_bulk_endpoint(d, d->props.generic_bulk_ctrl_endpoint);
+ if (ret)
+ return ret;
+ ret = dvb_usb_check_bulk_endpoint(d, d->props.generic_bulk_ctrl_endpoint_response);
+ if (ret)
+ return ret;
for (n = 0; n < d->props.num_adapters; n++) {
adap = &d->adapter[n];
adap->dev = d;
@@ -103,10 +132,8 @@ static int dvb_usb_adapter_init(struct dvb_usb_device *d, short *adapter_nrs)
* when reloading the driver w/o replugging the device
* sometimes a timeout occurs, this helps
*/
- if (d->props.generic_bulk_ctrl_endpoint != 0) {
- usb_clear_halt(d->udev, usb_sndbulkpipe(d->udev, d->props.generic_bulk_ctrl_endpoint));
- usb_clear_halt(d->udev, usb_rcvbulkpipe(d->udev, d->props.generic_bulk_ctrl_endpoint));
- }
+ dvb_usb_clear_halt(d, d->props.generic_bulk_ctrl_endpoint);
+ dvb_usb_clear_halt(d, d->props.generic_bulk_ctrl_endpoint_response);
return 0;
Infinite log printing occurs during fuzz test: rc rc1: DViCO FusionHDTV DVB-T USB (LGZ201) as ... ... dvb-usb: schedule remote query interval to 100 msecs. dvb-usb: DViCO FusionHDTV DVB-T USB (LGZ201) successfully initialized ... dvb-usb: bulk message failed: -22 (1/0) dvb-usb: bulk message failed: -22 (1/0) dvb-usb: bulk message failed: -22 (1/0) ... dvb-usb: bulk message failed: -22 (1/0) Looking into the codes, there is a loop in dvb_usb_read_remote_control(), that is in rc_core_dvb_usb_remote_init() create a work that will call dvb_usb_read_remote_control(), and this work will reschedule itself at 'rc_interval' intervals to recursively call dvb_usb_read_remote_control(), see following code snippet: rc_core_dvb_usb_remote_init() { ... INIT_DELAYED_WORK(&d->rc_query_work, dvb_usb_read_remote_control); schedule_delayed_work(&d->rc_query_work, msecs_to_jiffies(rc_interval)); ... } dvb_usb_read_remote_control() { ... err = d->props.rc.core.rc_query(d); if (err) err(...) // Did not return even if query failed schedule_delayed_work(&d->rc_query_work, msecs_to_jiffies(rc_interval)); } When the infinite log printing occurs, the query callback 'd->props.rc.core.rc_query' is cxusb_rc_query(). And the log is due to the failure of finding a valid 'generic_bulk_ctrl_endpoint' in usb_bulk_msg(), see following code snippet: cxusb_rc_query() { cxusb_ctrl_msg() { dvb_usb_generic_rw() { ret = usb_bulk_msg(d->udev, usb_sndbulkpipe(d->udev, d->props.generic_bulk_ctrl_endpoint),...); if (ret) err("bulk message failed: %d (%d/%d)",ret,wlen,actlen); ... } ... } By analyzing the corresponding USB descriptor, it shows that the bNumEndpoints is 0 in its interface descriptor, but the 'generic_bulk_ctrl_endpoint' is 1, that means user don't configure a valid endpoint for 'generic_bulk_ctrl_endpoint', therefore this 'invalid' USB device should be rejected before it calls into dvb_usb_read_remote_control(). To fix it, we need to add endpoint check for 'generic_bulk_ctrl_endpoint'. And as Sean suggested, the same check and clear halts should be done for 'generic_bulk_ctrl_endpoint_response'. So introduce dvb_usb_check_bulk_endpoint() to do it for both of them. Fixes: 4d43e13f723e ("V4L/DVB (4643): Multi-input patch for DVB-USB device") Signed-off-by: Zheng Yejian <zhengyejian1@huawei.com> --- drivers/media/usb/dvb-usb/dvb-usb-init.c | 35 +++++++++++++++++++++--- 1 file changed, 31 insertions(+), 4 deletions(-) v3: - Fix following warning: drivers/media/usb/dvb-usb/dvb-usb-init.c:133:9: warning: 'adap' may be used uninitialized [-Wmaybe-uninitialized] Link: https://lore.kernel.org/all/ZjTPqR3_EhbNU-fm@gofer.mess.org/ v2: - As Sean suggested, check endpoint and clear halt for both 'generic_bulk_ctrl_endpoint' and 'generic_bulk_ctrl_endpoint_response' with the new introduced dvb_usb_check_bulk_endpoint(); Link: https://lore.kernel.org/all/ZjCl97Ww6NrzJQCB@gofer.mess.org/ Link: https://lore.kernel.org/all/ZjC7rXU7ViaH60_S@gofer.mess.org/ - Add Fixes tag. - Link: https://lore.kernel.org/all/20240430104137.1014471-1-zhengyejian1@huawei.com/ v1: - Link: https://lore.kernel.org/all/20240412135256.1546051-1-zhengyejian1@huawei.com/