KMSAN: uninit-value in legacy_dvb_usb_read_remote

KMSAN: uninit-value in legacy_dvb_usb_read_remote_control
Status: upstream: reported C repro on 2020/12/12 17:43
Reported-by: syzbot+2cd8c5db4a85f0a04142@syzkaller.appspotmail.com
First crash: 133d, last: 4d14h

Patch testing requests:
Created	Duration	User	Repo	Result
2021/04/19 22:23	22m	phil@philpotter.co.uk	https://github.com/google/kmsan.git master	report log
2021/03/25 21:41	27m	alaaemadhossney.ae@gmail.com	https://github.com/google/kmsan.git master	report log
2021/01/09 19:39	23m	anant.thazhemadam@gmail.com	https://github.com/google/kmsan.git master	report log

Sample crash report:

=====================================================
BUG: KMSAN: uninit-value in legacy_dvb_usb_read_remote_control+0x396/0x700 drivers/media/usb/dvb-usb/dvb-usb-remote.c:129
CPU: 1 PID: 8378 Comm: kworker/1:4 Not tainted 5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events legacy_dvb_usb_read_remote_control
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x21c/0x280 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 legacy_dvb_usb_read_remote_control+0x396/0x700 drivers/media/usb/dvb-usb/dvb-usb-remote.c:129
 process_one_work+0x1219/0x1fe0 kernel/workqueue.c:2275
 worker_thread+0x10ec/0x2340 kernel/workqueue.c:2421
 kthread+0x521/0x560 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Local variable ----state@legacy_dvb_usb_read_remote_control created at:
 legacy_dvb_usb_read_remote_control+0x69/0x700 drivers/media/usb/dvb-usb/dvb-usb-remote.c:120
 legacy_dvb_usb_read_remote_control+0x69/0x700 drivers/media/usb/dvb-usb/dvb-usb-remote.c:120
=====================================================
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 8378 Comm: kworker/1:4 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events legacy_dvb_usb_read_remote_control
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x21c/0x280 lib/dump_stack.c:120
 panic+0x4c6/0xea7 kernel/panic.c:231
 kmsan_report+0x1de/0x1e0 mm/kmsan/kmsan_report.c:141
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 legacy_dvb_usb_read_remote_control+0x396/0x700 drivers/media/usb/dvb-usb/dvb-usb-remote.c:129
 process_one_work+0x1219/0x1fe0 kernel/workqueue.c:2275
 worker_thread+0x10ec/0x2340 kernel/workqueue.c:2421
 kthread+0x521/0x560 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (16):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-kmsan-gce	2021/02/27 20:56	https://github.com/google/kmsan.git master	29ad81a1	4c37c133	.config	log	report	syz	C		KMSAN: uninit-value in legacy_dvb_usb_read_remote_control
ci-upstream-kmsan-gce	2020/12/08 21:26	https://github.com/google/kmsan.git master	73d62e81	a7f7f4a4	.config	log	report	syz	C
ci-upstream-kmsan-gce	2021/04/16 17:12	https://github.com/google/kmsan.git master	4ebaab5f	7e2b734b	.config	log	report			info	KMSAN: uninit-value in legacy_dvb_usb_read_remote_control
ci-upstream-kmsan-gce	2021/02/28 08:47	https://github.com/google/kmsan.git master	29ad81a1	4c37c133	.config	log	report			info	KMSAN: uninit-value in legacy_dvb_usb_read_remote_control
ci-upstream-kmsan-gce	2021/02/19 12:53	https://github.com/google/kmsan.git master	29ad81a1	14052202	.config	log	report			info	KMSAN: uninit-value in legacy_dvb_usb_read_remote_control
ci-upstream-kmsan-gce	2021/02/17 16:27	https://github.com/google/kmsan.git master	29ad81a1	052f8d9f	.config	log	report			info	KMSAN: uninit-value in legacy_dvb_usb_read_remote_control
ci-upstream-kmsan-gce	2021/02/16 02:28	https://github.com/google/kmsan.git master	29ad81a1	98682e5e	.config	log	report			info	KMSAN: uninit-value in legacy_dvb_usb_read_remote_control
ci-upstream-kmsan-gce	2021/02/13 23:21	https://github.com/google/kmsan.git master	29ad81a1	98682e5e	.config	log	report			info	KMSAN: uninit-value in legacy_dvb_usb_read_remote_control
ci-upstream-kmsan-gce	2021/02/10 04:17	https://github.com/google/kmsan.git master	73d62e81	2bd9619f	.config	log	report			info	KMSAN: uninit-value in legacy_dvb_usb_read_remote_control
ci-upstream-kmsan-gce	2021/02/07 02:53	https://github.com/google/kmsan.git master	73d62e81	0655e081	.config	log	report			info	KMSAN: uninit-value in legacy_dvb_usb_read_remote_control
ci-upstream-kmsan-gce	2021/02/06 19:57	https://github.com/google/kmsan.git master	73d62e81	0655e081	.config	log	report			info	KMSAN: uninit-value in legacy_dvb_usb_read_remote_control
ci-upstream-kmsan-gce	2021/01/22 10:47	https://github.com/google/kmsan.git master	73d62e81	d4f4eca5	.config	log	report			info	KMSAN: uninit-value in legacy_dvb_usb_read_remote_control
ci-upstream-kmsan-gce-386	2021/02/15 07:50	https://github.com/google/kmsan.git master	29ad81a1	98682e5e	.config	log	report			info	KMSAN: uninit-value in legacy_dvb_usb_read_remote_control
ci-upstream-kmsan-gce-386	2021/01/22 04:44	https://github.com/google/kmsan.git master	73d62e81	d4f4eca5	.config	log	report			info	KMSAN: uninit-value in legacy_dvb_usb_read_remote_control
ci-upstream-kmsan-gce	2020/12/08 17:22	https://github.com/google/kmsan.git master	73d62e81	a7f7f4a4	.config	log	report			info
ci-upstream-kmsan-gce-386	2020/12/19 15:49	https://github.com/google/kmsan.git master	73d62e81	04201c06	.config	log	report			info