KMSAN: uninit-value in dvb_usb_adapter_dvb

KMSAN: uninit-value in dvb_usb_adapter_dvb_init (2)
Status: upstream: reported C repro on 2020/11/17 15:40
Reported-by: syzbot+e27b4fd589762b0b9329@syzkaller.appspotmail.com
First crash: 79d, last: 24d

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KMSAN: uninit-value in dvb_usb_adapter_dvb_init				1	445d	437d	16/17	fixed on 2020/02/18 14:31

Patch testing requests:
Created	Duration	User	Patch	Repo	Result
2020/12/07 05:16	23m	anant.thazhemadam@gmail.com	patch	https://github.com/google/kmsan.git master	OK

Sample crash report:

dvb-usb: bulk message failed: -22 (5/0)
dvb-usb: bulk message failed: -22 (5/0)
dvb-usb: bulk message failed: -22 (5/0)
=====================================================
BUG: KMSAN: uninit-value in mac_address_string+0x1040/0x1170 lib/vsprintf.c:1281
CPU: 1 PID: 3485 Comm: kworker/1:2 Not tainted 5.10.0-rc4-syzkaller #0
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+0x21c/0x280 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 mac_address_string+0x1040/0x1170 lib/vsprintf.c:1281
 pointer+0x9fe/0x1ca0 lib/vsprintf.c:2241
 vsnprintf+0x1a4f/0x3610 lib/vsprintf.c:2622
 vscnprintf+0xbe/0x1c0 lib/vsprintf.c:2721
 vprintk_store+0xff/0x14a0 kernel/printk/printk.c:1954
 vprintk_emit+0x2ae/0x820 kernel/printk/printk.c:2018
 vprintk_default+0x86/0xa0 kernel/printk/printk.c:2052
 vprintk_func+0x2ed/0x2f0 kernel/printk/printk_safe.c:393
 printk+0x180/0x1cd kernel/printk/printk.c:2083
 dvb_usb_adapter_dvb_init+0x818/0x1300 drivers/media/usb/dvb-usb/dvb-usb-dvb.c:166
 dvb_usb_adapter_init drivers/media/usb/dvb-usb/dvb-usb-init.c:83 [inline]
 dvb_usb_init drivers/media/usb/dvb-usb/dvb-usb-init.c:173 [inline]
 dvb_usb_device_init+0x27fd/0x3350 drivers/media/usb/dvb-usb/dvb-usb-init.c:287
 nova_t_probe+0x73/0x80 drivers/media/usb/dvb-usb/nova-t-usb2.c:156
 usb_probe_interface+0xfcc/0x1520 drivers/usb/core/driver.c:396
 really_probe+0xebd/0x2420 drivers/base/dd.c:558
 driver_probe_device+0x293/0x390 drivers/base/dd.c:738
 __device_attach_driver+0x63f/0x830 drivers/base/dd.c:844
 bus_for_each_drv+0x2ca/0x3f0 drivers/base/bus.c:431
 __device_attach+0x538/0x860 drivers/base/dd.c:912
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:959
 bus_probe_device+0x177/0x3d0 drivers/base/bus.c:491
 device_add+0x399e/0x3f20 drivers/base/core.c:2936
 usb_set_configuration+0x39cf/0x4010 drivers/usb/core/message.c:2159
 usb_generic_driver_probe+0x138/0x300 drivers/usb/core/generic.c:238
 usb_probe_device+0x317/0x570 drivers/usb/core/driver.c:293
 really_probe+0xebd/0x2420 drivers/base/dd.c:558
 driver_probe_device+0x293/0x390 drivers/base/dd.c:738
 __device_attach_driver+0x63f/0x830 drivers/base/dd.c:844
 bus_for_each_drv+0x2ca/0x3f0 drivers/base/bus.c:431
 __device_attach+0x538/0x860 drivers/base/dd.c:912
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:959
 bus_probe_device+0x177/0x3d0 drivers/base/bus.c:491
 device_add+0x399e/0x3f20 drivers/base/core.c:2936
 usb_new_device+0x1bd6/0x2a30 drivers/usb/core/hub.c:2554
 hub_port_connect drivers/usb/core/hub.c:5222 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5362 [inline]
 port_event drivers/usb/core/hub.c:5508 [inline]
 hub_event+0x5bc9/0x8890 drivers/usb/core/hub.c:5590
 process_one_work+0x121c/0x1fc0 kernel/workqueue.c:2272
 worker_thread+0x10cc/0x2740 kernel/workqueue.c:2418
 kthread+0x51c/0x560 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:289
 __msan_chain_origin+0x57/0xa0 mm/kmsan/kmsan_instr.c:147
 nova_t_read_mac_address+0x2d4/0x2f0 drivers/media/usb/dvb-usb/nova-t-usb2.c:144
 dvb_usb_adapter_dvb_init+0x774/0x1300 drivers/media/usb/dvb-usb/dvb-usb-dvb.c:165
 dvb_usb_adapter_init drivers/media/usb/dvb-usb/dvb-usb-init.c:83 [inline]
 dvb_usb_init drivers/media/usb/dvb-usb/dvb-usb-init.c:173 [inline]
 dvb_usb_device_init+0x27fd/0x3350 drivers/media/usb/dvb-usb/dvb-usb-init.c:287
 nova_t_probe+0x73/0x80 drivers/media/usb/dvb-usb/nova-t-usb2.c:156
 usb_probe_interface+0xfcc/0x1520 drivers/usb/core/driver.c:396
 really_probe+0xebd/0x2420 drivers/base/dd.c:558
 driver_probe_device+0x293/0x390 drivers/base/dd.c:738
 __device_attach_driver+0x63f/0x830 drivers/base/dd.c:844
 bus_for_each_drv+0x2ca/0x3f0 drivers/base/bus.c:431
 __device_attach+0x538/0x860 drivers/base/dd.c:912
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:959
 bus_probe_device+0x177/0x3d0 drivers/base/bus.c:491
 device_add+0x399e/0x3f20 drivers/base/core.c:2936
 usb_set_configuration+0x39cf/0x4010 drivers/usb/core/message.c:2159
 usb_generic_driver_probe+0x138/0x300 drivers/usb/core/generic.c:238
 usb_probe_device+0x317/0x570 drivers/usb/core/driver.c:293
 really_probe+0xebd/0x2420 drivers/base/dd.c:558
 driver_probe_device+0x293/0x390 drivers/base/dd.c:738
 __device_attach_driver+0x63f/0x830 drivers/base/dd.c:844
 bus_for_each_drv+0x2ca/0x3f0 drivers/base/bus.c:431
 __device_attach+0x538/0x860 drivers/base/dd.c:912
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:959
 bus_probe_device+0x177/0x3d0 drivers/base/bus.c:491
 device_add+0x399e/0x3f20 drivers/base/core.c:2936
 usb_new_device+0x1bd6/0x2a30 drivers/usb/core/hub.c:2554
 hub_port_connect drivers/usb/core/hub.c:5222 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5362 [inline]
 port_event drivers/usb/core/hub.c:5508 [inline]
 hub_event+0x5bc9/0x8890 drivers/usb/core/hub.c:5590
 process_one_work+0x121c/0x1fc0 kernel/workqueue.c:2272
 worker_thread+0x10cc/0x2740 kernel/workqueue.c:2418
 kthread+0x51c/0x560 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:289
 __msan_chain_origin+0x57/0xa0 mm/kmsan/kmsan_instr.c:147
 dibusb_read_eeprom_byte+0x513/0x540 drivers/media/usb/dvb-usb/dibusb-common.c:233
 nova_t_read_mac_address+0x1e3/0x2f0 drivers/media/usb/dvb-usb/nova-t-usb2.c:142
 dvb_usb_adapter_dvb_init+0x774/0x1300 drivers/media/usb/dvb-usb/dvb-usb-dvb.c:165
 dvb_usb_adapter_init drivers/media/usb/dvb-usb/dvb-usb-init.c:83 [inline]
 dvb_usb_init drivers/media/usb/dvb-usb/dvb-usb-init.c:173 [inline]
 dvb_usb_device_init+0x27fd/0x3350 drivers/media/usb/dvb-usb/dvb-usb-init.c:287
 nova_t_probe+0x73/0x80 drivers/media/usb/dvb-usb/nova-t-usb2.c:156
 usb_probe_interface+0xfcc/0x1520 drivers/usb/core/driver.c:396
 really_probe+0xebd/0x2420 drivers/base/dd.c:558
 driver_probe_device+0x293/0x390 drivers/base/dd.c:738
 __device_attach_driver+0x63f/0x830 drivers/base/dd.c:844
 bus_for_each_drv+0x2ca/0x3f0 drivers/base/bus.c:431
 __device_attach+0x538/0x860 drivers/base/dd.c:912
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:959
 bus_probe_device+0x177/0x3d0 drivers/base/bus.c:491
 device_add+0x399e/0x3f20 drivers/base/core.c:2936
 usb_set_configuration+0x39cf/0x4010 drivers/usb/core/message.c:2159
 usb_generic_driver_probe+0x138/0x300 drivers/usb/core/generic.c:238
 usb_probe_device+0x317/0x570 drivers/usb/core/driver.c:293
 really_probe+0xebd/0x2420 drivers/base/dd.c:558
 driver_probe_device+0x293/0x390 drivers/base/dd.c:738
 __device_attach_driver+0x63f/0x830 drivers/base/dd.c:844
 bus_for_each_drv+0x2ca/0x3f0 drivers/base/bus.c:431
 __device_attach+0x538/0x860 drivers/base/dd.c:912
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:959
 bus_probe_device+0x177/0x3d0 drivers/base/bus.c:491
 device_add+0x399e/0x3f20 drivers/base/core.c:2936
 usb_new_device+0x1bd6/0x2a30 drivers/usb/core/hub.c:2554
 hub_port_connect drivers/usb/core/hub.c:5222 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5362 [inline]
 port_event drivers/usb/core/hub.c:5508 [inline]
 hub_event+0x5bc9/0x8890 drivers/usb/core/hub.c:5590
 process_one_work+0x121c/0x1fc0 kernel/workqueue.c:2272
 worker_thread+0x10cc/0x2740 kernel/workqueue.c:2418
 kthread+0x51c/0x560 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2906 [inline]
 slab_alloc mm/slub.c:2915 [inline]
 kmem_cache_alloc_trace+0x869/0x1020 mm/slub.c:2932
 kmalloc include/linux/slab.h:552 [inline]
 dibusb_read_eeprom_byte+0xad/0x540 drivers/media/usb/dvb-usb/dibusb-common.c:226
 nova_t_read_mac_address+0x1e3/0x2f0 drivers/media/usb/dvb-usb/nova-t-usb2.c:142
 dvb_usb_adapter_dvb_init+0x774/0x1300 drivers/media/usb/dvb-usb/dvb-usb-dvb.c:165
 dvb_usb_adapter_init drivers/media/usb/dvb-usb/dvb-usb-init.c:83 [inline]
 dvb_usb_init drivers/media/usb/dvb-usb/dvb-usb-init.c:173 [inline]
 dvb_usb_device_init+0x27fd/0x3350 drivers/media/usb/dvb-usb/dvb-usb-init.c:287
 nova_t_probe+0x73/0x80 drivers/media/usb/dvb-usb/nova-t-usb2.c:156
 usb_probe_interface+0xfcc/0x1520 drivers/usb/core/driver.c:396
 really_probe+0xebd/0x2420 drivers/base/dd.c:558
 driver_probe_device+0x293/0x390 drivers/base/dd.c:738
 __device_attach_driver+0x63f/0x830 drivers/base/dd.c:844
 bus_for_each_drv+0x2ca/0x3f0 drivers/base/bus.c:431
 __device_attach+0x538/0x860 drivers/base/dd.c:912
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:959
 bus_probe_device+0x177/0x3d0 drivers/base/bus.c:491
 device_add+0x399e/0x3f20 drivers/base/core.c:2936
 usb_set_configuration+0x39cf/0x4010 drivers/usb/core/message.c:2159
 usb_generic_driver_probe+0x138/0x300 drivers/usb/core/generic.c:238
 usb_probe_device+0x317/0x570 drivers/usb/core/driver.c:293
 really_probe+0xebd/0x2420 drivers/base/dd.c:558
 driver_probe_device+0x293/0x390 drivers/base/dd.c:738
 __device_attach_driver+0x63f/0x830 drivers/base/dd.c:844
 bus_for_each_drv+0x2ca/0x3f0 drivers/base/bus.c:431
 __device_attach+0x538/0x860 drivers/base/dd.c:912
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:959
 bus_probe_device+0x177/0x3d0 drivers/base/bus.c:491
 device_add+0x399e/0x3f20 drivers/base/core.c:2936
 usb_new_device+0x1bd6/0x2a30 drivers/usb/core/hub.c:2554
 hub_port_connect drivers/usb/core/hub.c:5222 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5362 [inline]
 port_event drivers/usb/core/hub.c:5508 [inline]
 hub_event+0x5bc9/0x8890 drivers/usb/core/hub.c:5590
 process_one_work+0x121c/0x1fc0 kernel/workqueue.c:2272
 worker_thread+0x10cc/0x2740 kernel/workqueue.c:2418
 kthread+0x51c/0x560 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
=====================================================

Crashes (18):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Maintainers
ci-upstream-kmsan-gce	2020/12/05 09:56	https://github.com/google/kmsan.git master	73d62e81	20366b87	.config	log	report	syz	C		linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/12/26 05:14	https://github.com/google/kmsan.git master	73d62e81	821e0b09	.config	log	report			info	linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/12/22 18:49	https://github.com/google/kmsan.git master	73d62e81	04201c06	.config	log	report			info	linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/12/22 18:37	https://github.com/google/kmsan.git master	73d62e81	04201c06	.config	log	report			info	linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/12/13 16:15	https://github.com/google/kmsan.git master	73d62e81	bca53db9	.config	log	report			info	linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/12/13 13:21	https://github.com/google/kmsan.git master	73d62e81	bca53db9	.config	log	report			info	linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/12/11 17:15	https://github.com/google/kmsan.git master	73d62e81	ba24ffcd	.config	log	report			info	linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/12/11 17:15	https://github.com/google/kmsan.git master	73d62e81	ba24ffcd	.config	log	report			info	linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/12/07 16:27	https://github.com/google/kmsan.git master	73d62e81	1190297f	.config	log	report			info	linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/12/05 20:32	https://github.com/google/kmsan.git master	73d62e81	50503117	.config	log	report			info	linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce	2020/12/05 08:35	https://github.com/google/kmsan.git master	73d62e81	20366b87	.config	log	report			info	linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce-386	2020/12/22 18:48	https://github.com/google/kmsan.git master	73d62e81	04201c06	.config	log	report			info	linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce-386	2020/12/22 18:36	https://github.com/google/kmsan.git master	73d62e81	04201c06	.config	log	report			info	linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce-386	2020/12/13 19:21	https://github.com/google/kmsan.git master	73d62e81	bca53db9	.config	log	report			info	linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce-386	2020/12/13 19:21	https://github.com/google/kmsan.git master	73d62e81	bca53db9	.config	log	report			info	linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce-386	2020/12/13 13:21	https://github.com/google/kmsan.git master	73d62e81	bca53db9	.config	log	report			info	linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce-386	2020/12/05 08:57	https://github.com/google/kmsan.git master	73d62e81	20366b87	.config	log	report			info	linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org
ci-upstream-kmsan-gce-386	2020/10/31 21:20	https://github.com/google/kmsan.git master	e1617422	8bc4594f	.config	log	report			info	linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org