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: 622d, last: 1d11h

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KMSAN: uninit-value in dib3000mb_attach	C			3	622d	622d	0/21	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 (396):
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	2021/03/06 10:13	https://github.com/google/kmsan.git master	29ad81a1	56722561	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/03/02 23:00	https://github.com/google/kmsan.git master	29ad81a1	92ead296	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/28 15:24	https://github.com/google/kmsan.git master	29ad81a1	4c37c133	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/28 08:21	https://github.com/google/kmsan.git master	29ad81a1	4c37c133	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/28 00:47	https://github.com/google/kmsan.git master	29ad81a1	4c37c133	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/27 21:24	https://github.com/google/kmsan.git master	29ad81a1	4c37c133	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/27 20:17	https://github.com/google/kmsan.git master	29ad81a1	4c37c133	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/27 19:20	https://github.com/google/kmsan.git master	29ad81a1	4c37c133	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/27 18:15	https://github.com/google/kmsan.git master	29ad81a1	4c37c133	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/27 18:15	https://github.com/google/kmsan.git master	29ad81a1	4c37c133	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/27 04:45	https://github.com/google/kmsan.git master	29ad81a1	4c37c133	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/25 21:44	https://github.com/google/kmsan.git master	29ad81a1	76f7fc95	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/25 06:46	https://github.com/google/kmsan.git master	29ad81a1	fcc6d71b	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/23 08:52	https://github.com/google/kmsan.git master	29ad81a1	c26fb06b	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/23 05:34	https://github.com/google/kmsan.git master	29ad81a1	c26fb06b	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/22 14:25	https://github.com/google/kmsan.git master	29ad81a1	a659b3f1	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/22 11:38	https://github.com/google/kmsan.git master	29ad81a1	a659b3f1	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/21 16:56	https://github.com/google/kmsan.git master	29ad81a1	3e5ed8b4	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/21 15:42	https://github.com/google/kmsan.git master	29ad81a1	3e5ed8b4	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/21 12:08	https://github.com/google/kmsan.git master	29ad81a1	3e5ed8b4	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/21 11:46	https://github.com/google/kmsan.git master	29ad81a1	3e5ed8b4	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/20 23:25	https://github.com/google/kmsan.git master	29ad81a1	3e5ed8b4	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/20 19:01	https://github.com/google/kmsan.git master	29ad81a1	3e5ed8b4	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/20 15:48	https://github.com/google/kmsan.git master	29ad81a1	3e5ed8b4	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/20 14:39	https://github.com/google/kmsan.git master	29ad81a1	3e5ed8b4	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/20 13:30	https://github.com/google/kmsan.git master	29ad81a1	3e5ed8b4	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/19 15:08	https://github.com/google/kmsan.git master	29ad81a1	14052202	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/17 16:18	https://github.com/google/kmsan.git master	29ad81a1	052f8d9f	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/16 22:59	https://github.com/google/kmsan.git master	29ad81a1	98682e5e	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/16 04:27	https://github.com/google/kmsan.git master	29ad81a1	98682e5e	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/15 23:03	https://github.com/google/kmsan.git master	29ad81a1	98682e5e	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/15 16:04	https://github.com/google/kmsan.git master	29ad81a1	98682e5e	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce	2021/02/14 09:33	https://github.com/google/kmsan.git master	29ad81a1	98682e5e	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce-386	2021/03/06 08:36	https://github.com/google/kmsan.git master	29ad81a1	56722561	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce-386	2021/03/06 04:57	https://github.com/google/kmsan.git master	29ad81a1	56722561	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce-386	2021/03/01 13:46	https://github.com/google/kmsan.git master	29ad81a1	4c37c133	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce-386	2021/02/28 16:48	https://github.com/google/kmsan.git master	29ad81a1	4c37c133	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce-386	2021/02/28 10:21	https://github.com/google/kmsan.git master	29ad81a1	4c37c133	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce-386	2021/02/26 23:25	https://github.com/google/kmsan.git master	29ad81a1	4c37c133	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce-386	2021/02/26 15:18	https://github.com/google/kmsan.git master	29ad81a1	4c37c133	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce-386	2021/02/25 12:25	https://github.com/google/kmsan.git master	29ad81a1	fcc6d71b	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce-386	2021/02/23 13:01	https://github.com/google/kmsan.git master	29ad81a1	c26fb06b	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce-386	2021/02/23 06:48	https://github.com/google/kmsan.git master	29ad81a1	c26fb06b	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce-386	2021/02/16 13:10	https://github.com/google/kmsan.git master	29ad81a1	98682e5e	.config	log	report			info	KMSAN: uninit-value in dib3000mb_attach
ci-upstream-kmsan-gce-386	2021/02/16 00:25	https://github.com/google/kmsan.git master	29ad81a1	98682e5e	.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