KMSAN: uninit-value in dib3000mb

KMSAN: uninit-value in dib3000mb_attach (2)
Status: upstream: reported C repro on 2020/10/23 08:07
Reported-by: syzbot+c88fc0ebe0d5935c70da@syzkaller.appspotmail.com
First crash: 726d, last: 11d

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KMSAN: uninit-value in dib3000mb_attach	C			3	726d	727d	0/22	closed as invalid on 2019/06/24 13:36

Patch testing requests:
Created	Duration	User	Patch	Repo	Result
2021/03/25 21:55	46m	alaaemadhossney.ae@gmail.com		https://github.com/google/kmsan.git master	OK

Sample crash report:

dvb-usb: will use the device's hardware PID filter (table count: 16).
dvbdev: DVB: registering new adapter (Grandtec USB1.1 DVB-T)
usb 1-1: media controller created
dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered.
dvb-usb: bulk message failed: -22 (6/-30592)
==================================================================
BUG: KMSAN: uninit-value in dib3000mb_attach+0x340/0x450 drivers/media/dvb-frontends/dib3000mb.c:762
CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.2.0-rc4+ #5
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.c:611
 __msan_warning+0x75/0xe0 mm/kmsan/kmsan_instr.c:304
 dib3000mb_attach+0x340/0x450 drivers/media/dvb-frontends/dib3000mb.c:762
 dibusb_dib3000mb_frontend_attach+0x1af/0x3b0 drivers/media/usb/dvb-usb/dibusb-mb.c:34
 dvb_usb_adapter_frontend_init+0x105/0xa00 drivers/media/usb/dvb-usb/dvb-usb-dvb.c:291
 dvb_usb_adapter_init drivers/media/usb/dvb-usb/dvb-usb-init.c:84 [inline]
 dvb_usb_init drivers/media/usb/dvb-usb/dvb-usb-init.c:160 [inline]
 dvb_usb_device_init+0x2297/0x2cc0 drivers/media/usb/dvb-usb/dvb-usb-init.c:274
 dibusb_probe+0x75/0x280 drivers/media/usb/dvb-usb/dibusb-mb.c:113
 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
 worker_thread+0x111b/0x2460 kernel/workqueue.c:2415
 kthread+0x4b5/0x4f0 kernel/kthread.c:256
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355

Local variable description: ----rb@dib3000_read_reg
Variable was created at:
 dib3000_read_reg+0xdb/0x540 drivers/media/dvb-frontends/dib3000mb.c:58
 dib3000mb_attach+0x17d/0x450 drivers/media/dvb-frontends/dib3000mb.c:762
==================================================================

Crashes (613):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-kmsan-gce	2019/06/24 18:41	https://github.com/google/kmsan.git master	3351e2b9	472f0082	.config	log	report	syz	C
ci-upstream-kmsan-gce	2021/06/08 12:09	https://github.com/google/kmsan.git master	6099c9da	b718257f	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/06/08 04:23	https://github.com/google/kmsan.git master	6099c9da	e59537be	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/06/07 18:31	https://github.com/google/kmsan.git master	6099c9da	e59537be	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/06/01 11:17	https://github.com/google/kmsan.git master	6099c9da	032639db	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/30 20:41	https://github.com/google/kmsan.git master	6099c9da	325a8dab	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/27 08:04	https://github.com/google/kmsan.git master	6099c9da	858ea628	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/20 04:15	https://github.com/google/kmsan.git master	6099c9da	a343ba6b	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/19 19:29	https://github.com/google/kmsan.git master	6099c9da	a343ba6b	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/16 04:18	https://github.com/google/kmsan.git master	bdefec9a	f54a5c09	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/15 14:36	https://github.com/google/kmsan.git master	bdefec9a	93f844de	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/15 12:30	https://github.com/google/kmsan.git master	bdefec9a	93f844de	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/14 14:05	https://github.com/google/kmsan.git master	bdefec9a	8bdd5343	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/13 07:10	https://github.com/google/kmsan.git master	bdefec9a	ed7d41c5	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/12 21:06	https://github.com/google/kmsan.git master	bdefec9a	da958a4d	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/10 14:20	https://github.com/google/kmsan.git master	4ebaab5f	ca873091	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/10 12:45	https://github.com/google/kmsan.git master	4ebaab5f	ca873091	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/10 10:26	https://github.com/google/kmsan.git master	4ebaab5f	bc5434be	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/10 08:12	https://github.com/google/kmsan.git master	4ebaab5f	bc5434be	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/10 05:36	https://github.com/google/kmsan.git master	4ebaab5f	bc5434be	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/10 05:26	https://github.com/google/kmsan.git master	4ebaab5f	bc5434be	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/10 03:16	https://github.com/google/kmsan.git master	4ebaab5f	bc5434be	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/09 23:58	https://github.com/google/kmsan.git master	4ebaab5f	bc5434be	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/09 18:38	https://github.com/google/kmsan.git master	4ebaab5f	bc5434be	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/09 16:24	https://github.com/google/kmsan.git master	4ebaab5f	bc5434be	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/09 13:41	https://github.com/google/kmsan.git master	4ebaab5f	bc5434be	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/06 03:42	https://github.com/google/kmsan.git master	4ebaab5f	06c27ff5	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/04 12:59	https://github.com/google/kmsan.git master	4ebaab5f	09efdd63	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/04 02:08	https://github.com/google/kmsan.git master	4ebaab5f	ad61f371	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/03 08:32	https://github.com/google/kmsan.git master	4ebaab5f	77e2b668	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/03 01:32	https://github.com/google/kmsan.git master	4ebaab5f	77e2b668	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/02 08:49	https://github.com/google/kmsan.git master	4ebaab5f	77e2b668	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/05/01 20:50	https://github.com/google/kmsan.git master	4ebaab5f	77e2b668	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/04/30 21:13	https://github.com/google/kmsan.git master	4ebaab5f	77e2b668	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/04/30 05:22	https://github.com/google/kmsan.git master	4ebaab5f	77e2b668	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/04/28 05:53	https://github.com/google/kmsan.git master	4ebaab5f	805b5003	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/04/27 21:14	https://github.com/google/kmsan.git master	4ebaab5f	805b5003	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce-386	2021/06/06 05:04	https://github.com/google/kmsan.git master	6099c9da	500c2339	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce-386	2021/05/19 20:03	https://github.com/google/kmsan.git master	6099c9da	a343ba6b	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce-386	2021/05/10 07:04	https://github.com/google/kmsan.git master	4ebaab5f	bc5434be	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce-386	2021/05/10 06:53	https://github.com/google/kmsan.git master	4ebaab5f	bc5434be	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce-386	2021/05/09 17:27	https://github.com/google/kmsan.git master	4ebaab5f	bc5434be	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce-386	2021/05/09 16:50	https://github.com/google/kmsan.git master	4ebaab5f	bc5434be	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce-386	2021/05/06 23:17	https://github.com/google/kmsan.git master	4ebaab5f	06585184	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce-386	2021/05/02 10:14	https://github.com/google/kmsan.git master	4ebaab5f	77e2b668	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce-386	2021/05/01 13:53	https://github.com/google/kmsan.git master	4ebaab5f	77e2b668	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/01/17 03:04	https://github.com/google/kmsan.git master	73d62e81	65a7a854	.config	log	report			info
ci-upstream-kmsan-gce	2019/06/24 17:25	https://github.com/google/kmsan.git master	3351e2b9	472f0082	.config	log	report