KMSAN: uninit-value in friio_power

KMSAN: uninit-value in friio_power_ctrl
Status: upstream: reported C repro on 2019/07/10 13:48
Reported-by: syzbot+9e6bf7282557bd1fc80d@syzkaller.appspotmail.com
First crash: 710d, last: 599d

Patch testing requests:
Created	Duration	User	Patch	Repo	Result
2020/09/20 16:37	20m	anant.thazhemadam@gmail.com		https://github.com/google/kmsan.git master	OK
2019/08/15 08:25	21m	hverkuil@xs4all.nl	patch	https://github.com/google/kmsan.git master	OK
2019/08/15 07:47	21m	hverkuil@xs4all.nl	patch	https://github.com/google/kmsan.git master	OK
2019/07/25 04:05	20m	c0d1n61at3@gmail.com	patch	https://github.com/google/kmsan.git master	OK

Sample crash report:

==================================================================
BUG: KMSAN: uninit-value in friio_reset drivers/media/usb/dvb-usb-v2/gl861.c:433 [inline]
BUG: KMSAN: uninit-value in friio_power_ctrl+0xb3e/0x1a70 drivers/media/usb/dvb-usb-v2/gl861.c:482
CPU: 1 PID: 17 Comm: kworker/1:0 Not tainted 5.2.0+ #15
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x191/0x1f0 lib/dump_stack.c:113
 kmsan_report+0x162/0x2d0 mm/kmsan/kmsan_report.c:109
 __msan_warning+0x75/0xe0 mm/kmsan/kmsan_instr.c:294
 friio_reset drivers/media/usb/dvb-usb-v2/gl861.c:433 [inline]
 friio_power_ctrl+0xb3e/0x1a70 drivers/media/usb/dvb-usb-v2/gl861.c:482
 dvb_usbv2_device_power_ctrl drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:540 [inline]
 dvb_usbv2_init drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:853 [inline]
 dvb_usbv2_probe+0xd3d/0x5dd0 drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:980
 usb_probe_interface+0xd19/0x1310 drivers/usb/core/driver.c:361
 really_probe+0x1344/0x1d90 drivers/base/dd.c:513
 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:670
 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:777
 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:454
 __device_attach+0x489/0x750 drivers/base/dd.c:843
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:890
 bus_probe_device+0x131/0x390 drivers/base/bus.c:514
 device_add+0x25b5/0x2df0 drivers/base/core.c:2111
 usb_set_configuration+0x309f/0x3710 drivers/usb/core/message.c:2027
 generic_probe+0xe7/0x280 drivers/usb/core/generic.c:210
 usb_probe_device+0x146/0x200 drivers/usb/core/driver.c:266
 really_probe+0x1344/0x1d90 drivers/base/dd.c:513
 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:670
 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:777
 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:454
 __device_attach+0x489/0x750 drivers/base/dd.c:843
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:890
 bus_probe_device+0x131/0x390 drivers/base/bus.c:514
 device_add+0x25b5/0x2df0 drivers/base/core.c:2111
 usb_new_device+0x23e5/0x2fb0 drivers/usb/core/hub.c:2534
 hub_port_connect drivers/usb/core/hub.c:5089 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5204 [inline]
 port_event drivers/usb/core/hub.c:5350 [inline]
 hub_event+0x5853/0x7320 drivers/usb/core/hub.c:5432
 process_one_work+0x1572/0x1f00 kernel/workqueue.c:2269
 process_scheduled_works kernel/workqueue.c:2331 [inline]
 worker_thread+0x189c/0x2460 kernel/workqueue.c:2417
 kthread+0x4b5/0x4f0 kernel/kthread.c:256
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355

Local variable description: ----rbuf.i@friio_power_ctrl
Variable was created at:
 friio_reset drivers/media/usb/dvb-usb-v2/gl861.c:400 [inline]
 friio_power_ctrl+0x92/0x1a70 drivers/media/usb/dvb-usb-v2/gl861.c:482
 dvb_usbv2_device_power_ctrl drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:540 [inline]
 dvb_usbv2_init drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:853 [inline]
 dvb_usbv2_probe+0xd3d/0x5dd0 drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:980
==================================================================

Crashes (38):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro
ci-upstream-kmsan-gce	2019/08/03 12:30	https://github.com/google/kmsan.git master	beaab8a3	6affd8e8	.config	log	report	syz	C
ci-upstream-kmsan-gce	2019/08/03 07:33	https://github.com/google/kmsan.git master	beaab8a3	6affd8e8	.config	log	report	syz	C
ci-upstream-kmsan-gce	2019/07/10 13:59	https://github.com/google/kmsan.git master	4009f3cf	f62e1e85	.config	log	report	syz	C
ci-upstream-kmsan-gce	2019/10/29 19:46	https://github.com/google/kmsan.git master	96c6c319	5ea87a66	.config	log	report
ci-upstream-kmsan-gce	2019/10/29 19:42	https://github.com/google/kmsan.git master	96c6c319	5ea87a66	.config	log	report
ci-upstream-kmsan-gce	2019/10/26 20:13	https://github.com/google/kmsan.git master	d86c1556	25bb509e	.config	log	report
ci-upstream-kmsan-gce	2019/10/26 04:14	https://github.com/google/kmsan.git master	d86c1556	c2e837da	.config	log	report
ci-upstream-kmsan-gce	2019/10/26 00:31	https://github.com/google/kmsan.git master	d86c1556	c2e837da	.config	log	report
ci-upstream-kmsan-gce	2019/10/25 02:53	https://github.com/google/kmsan.git master	d86c1556	d01bb02a	.config	log	report
ci-upstream-kmsan-gce	2019/10/22 18:38	https://github.com/google/kmsan.git master	3c8ca708	5681358a	.config	log	report
ci-upstream-kmsan-gce	2019/10/21 19:57	https://github.com/google/kmsan.git master	3c8ca708	b24d2b8a	.config	log	report
ci-upstream-kmsan-gce	2019/10/21 08:02	https://github.com/google/kmsan.git master	3c8ca708	8c88c9c1	.config	log	report
ci-upstream-kmsan-gce	2019/10/19 22:32	https://github.com/google/kmsan.git master	3c8ca708	8c88c9c1	.config	log	report
ci-upstream-kmsan-gce	2019/10/19 17:40	https://github.com/google/kmsan.git master	3c8ca708	8c88c9c1	.config	log	report
ci-upstream-kmsan-gce	2019/10/19 14:41	https://github.com/google/kmsan.git master	3c8ca708	8c88c9c1	.config	log	report
ci-upstream-kmsan-gce	2019/10/18 21:36	https://github.com/google/kmsan.git master	3c8ca708	8c88c9c1	.config	log	report
ci-upstream-kmsan-gce	2019/10/18 11:28	https://github.com/google/kmsan.git master	3c8ca708	8c88c9c1	.config	log	report
ci-upstream-kmsan-gce	2019/10/17 15:53	https://github.com/google/kmsan.git master	18ccb5c7	8c88c9c1	.config	log	report
ci-upstream-kmsan-gce	2019/10/16 14:29	https://github.com/google/kmsan.git master	c2453450	d4ea592f	.config	log	report
ci-upstream-kmsan-gce	2019/10/12 21:59	https://github.com/google/kmsan.git master	fa169025	426631dd	.config	log	report
ci-upstream-kmsan-gce	2019/10/11 09:08	https://github.com/google/kmsan.git master	c38191cb	1a3bad90	.config	log	report
ci-upstream-kmsan-gce	2019/10/09 19:01	https://github.com/google/kmsan.git master	eff1487c	312c6a5a	.config	log	report
ci-upstream-kmsan-gce	2019/10/09 05:13	https://github.com/google/kmsan.git master	cebb918b	b1ebbfef	.config	log	report
ci-upstream-kmsan-gce	2019/10/06 17:48	https://github.com/google/kmsan.git master	1e76a3e5	f3f7d9c8	.config	log	report
ci-upstream-kmsan-gce	2019/10/04 21:23	https://github.com/google/kmsan.git master	1e76a3e5	f3f7d9c8	.config	log	report
ci-upstream-kmsan-gce	2019/10/03 10:53	https://github.com/google/kmsan.git master	1e76a3e5	fc17ba49	.config	log	report
ci-upstream-kmsan-gce	2019/09/28 01:27	https://github.com/google/kmsan.git master	9baf75aa	d8074e0b	.config	log	report
ci-upstream-kmsan-gce	2019/09/17 03:51	https://github.com/google/kmsan.git master	cebbfdbc	51ca0454	.config	log	report
ci-upstream-kmsan-gce	2019/08/22 12:19	https://github.com/google/kmsan.git master	61ccdad1	984250d5	.config	log	report
ci-upstream-kmsan-gce	2019/08/17 09:31	https://github.com/google/kmsan.git master	61ccdad1	8fd428a1	.config	log	report
ci-upstream-kmsan-gce	2019/08/16 04:57	https://github.com/google/kmsan.git master	61ccdad1	8fd428a1	.config	log	report
ci-upstream-kmsan-gce	2019/08/12 12:25	https://github.com/google/kmsan.git master	61ccdad1	acb51638	.config	log	report
ci-upstream-kmsan-gce	2019/08/12 12:10	https://github.com/google/kmsan.git master	61ccdad1	acb51638	.config	log	report
ci-upstream-kmsan-gce	2019/08/02 00:22	https://github.com/google/kmsan.git master	beaab8a3	835dffe7	.config	log	report
ci-upstream-kmsan-gce	2019/07/24 00:44	https://github.com/google/kmsan.git master	beaab8a3	de453f34	.config	log	report
ci-upstream-kmsan-gce	2019/07/24 00:42	https://github.com/google/kmsan.git master	beaab8a3	de453f34	.config	log	report
ci-upstream-kmsan-gce	2019/07/10 11:21	https://github.com/google/kmsan.git master	4009f3cf	f62e1e85	.config	log	report
ci-upstream-kmsan-gce	2019/07/10 10:33	https://github.com/google/kmsan.git master	4009f3cf	f62e1e85	.config	log	report