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: 528d, last: 4h06m

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KMSAN: uninit-value in dib3000mb_attach	C			3	528d	528d	0/17	closed as invalid on 2019/06/24 13:36

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 (174):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Maintainers
ci-upstream-kmsan-gce	2019/06/24 18:41	https://github.com/google/kmsan.git master	3351e2b9	472f0082	.config	log	report	syz	C		linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/12/03 18:50	https://github.com/google/kmsan.git master	73d62e81	e6b0d314	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/12/03 05:03	https://github.com/google/kmsan.git master	73d62e81	8c9190ef	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/12/02 06:20	https://github.com/google/kmsan.git master	73d62e81	c42a35e9	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/11/30 23:30	https://github.com/google/kmsan.git master	73d62e81	78d50c1d	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/11/30 11:35	https://github.com/google/kmsan.git master	73d62e81	a0092f9d	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/11/29 03:13	https://github.com/google/kmsan.git master	73d62e81	a0092f9d	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/11/28 20:39	https://github.com/google/kmsan.git master	73d62e81	76b4dcc7	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/11/26 22:42	https://github.com/google/kmsan.git master	73d62e81	1d2b823e	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/11/26 20:20	https://github.com/google/kmsan.git master	73d62e81	1d2b823e	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/11/26 01:09	https://github.com/google/kmsan.git master	73d62e81	2f1cec62	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/11/20 18:04	https://github.com/google/kmsan.git master	73d62e81	740ff461	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/11/19 16:35	https://github.com/google/kmsan.git master	73d62e81	0767f13f	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/11/17 17:15	https://github.com/google/kmsan.git master	73d62e81	bd2a760b	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/11/17 12:42	https://github.com/google/kmsan.git master	73d62e81	1bf9a662	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/11/16 17:06	https://github.com/google/kmsan.git master	73d62e81	1bf9a662	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/10/19 19:07	https://github.com/google/kmsan.git master	e67f4ba8	ff4a3345	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/10/18 04:54	https://github.com/google/kmsan.git master	e67f4ba8	fea47c01	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/10/17 17:19	https://github.com/google/kmsan.git master	e67f4ba8	fea47c01	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/10/16 19:08	https://github.com/google/kmsan.git master	e67f4ba8	6e262c73	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/10/14 20:02	https://github.com/google/kmsan.git master	e67f4ba8	fc7735a2	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/10/14 04:45	https://github.com/google/kmsan.git master	e67f4ba8	fc7735a2	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/10/13 20:36	https://github.com/google/kmsan.git master	e67f4ba8	bd69ee0d	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/10/12 19:15	https://github.com/google/kmsan.git master	e67f4ba8	d32b0bbf	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/10/11 19:34	https://github.com/google/kmsan.git master	e67f4ba8	4a77ae0b	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2019/06/24 17:25	https://github.com/google/kmsan.git master	3351e2b9	472f0082	.config	log	report				linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce-386	2020/12/01 12:41	https://github.com/google/kmsan.git master	73d62e81	b3a34598	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce-386	2020/11/28 19:28	https://github.com/google/kmsan.git master	73d62e81	76b4dcc7	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce-386	2020/11/26 20:08	https://github.com/google/kmsan.git master	73d62e81	1d2b823e	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce-386	2020/11/17 22:56	https://github.com/google/kmsan.git master	73d62e81	bd2a760b	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce-386	2020/11/17 11:21	https://github.com/google/kmsan.git master	73d62e81	1bf9a662	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce-386	2020/11/11 14:16	https://github.com/google/kmsan.git master	e1617422	cca87986	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce-386	2020/11/11 01:29	https://github.com/google/kmsan.git master	e1617422	cca87986	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce-386	2020/11/07 18:04	https://github.com/google/kmsan.git master	e1617422	64069d48	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce-386	2020/11/05 17:22	https://github.com/google/kmsan.git master	e1617422	64069d48	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce-386	2020/11/05 10:43	https://github.com/google/kmsan.git master	e1617422	64069d48	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce-386	2020/11/03 20:50	https://github.com/google/kmsan.git master	e1617422	cba33199	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce-386	2020/11/03 20:12	https://github.com/google/kmsan.git master	e1617422	cba33199	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce-386	2020/11/03 01:09	https://github.com/google/kmsan.git master	e1617422	8bc4594f	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce-386	2020/11/02 21:27	https://github.com/google/kmsan.git master	e1617422	8bc4594f	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce-386	2020/11/01 09:14	https://github.com/google/kmsan.git master	e1617422	8bc4594f	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce-386	2020/10/30 21:31	https://github.com/google/kmsan.git master	e1617422	a6e3ac3b	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce-386	2020/10/25 16:19	https://github.com/google/kmsan.git master	e1617422	a1839e81	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce-386	2020/10/23 00:22	https://github.com/google/kmsan.git master	e1617422	4e740c00	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce-386	2020/10/20 20:19	https://github.com/google/kmsan.git master	e1617422	ff4a3345	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce-386	2020/10/19 17:59	https://github.com/google/kmsan.git master	e67f4ba8	ff4a3345	.config	log	report			info	gustavoars@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org