KMSAN: uninit-value in ax88178

KMSAN: uninit-value in ax88178_bind
Status: upstream: reported C repro on 2019/06/07 19:13
Reported-by: syzbot+abd25d675d47f23f188c@syzkaller.appspotmail.com
First crash: 686d, last: 628d

Patch testing requests:
Created	Duration	User	Patch	Repo	Result
2020/09/20 16:38	18m	anant.thazhemadam@gmail.com		https://github.com/google/kmsan.git master	OK

Sample crash report:

usb 1-1: config 0 has no interface number 0
usb 1-1: New USB device found, idVendor=04bb, idProduct=0930, bcdDevice=d2.4a
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
==================================================================
BUG: KMSAN: uninit-value in is_valid_ether_addr include/linux/etherdevice.h:195 [inline]
BUG: KMSAN: uninit-value in asix_set_netdev_dev_addr drivers/net/usb/asix_devices.c:61 [inline]
BUG: KMSAN: uninit-value in ax88178_bind+0x635/0xad0 drivers/net/usb/asix_devices.c:1075
CPU: 1 PID: 40 Comm: kworker/1:2 Not tainted 5.2.0+ #15
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_report.c:109
 __msan_warning+0x75/0xe0 mm/kmsan/kmsan_instr.c:294
 is_valid_ether_addr include/linux/etherdevice.h:195 [inline]
 asix_set_netdev_dev_addr drivers/net/usb/asix_devices.c:61 [inline]
 ax88178_bind+0x635/0xad0 drivers/net/usb/asix_devices.c:1075
 usbnet_probe+0x10d3/0x3950 drivers/net/usb/usbnet.c:1722
 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: ----buf@ax88178_bind
Variable was created at:
 ax88178_bind+0x60/0xad0 drivers/net/usb/asix_devices.c:1064
 usbnet_probe+0x10d3/0x3950 drivers/net/usb/usbnet.c:1722
==================================================================

Crashes (17):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro
ci-upstream-kmsan-gce	2019/07/26 12:31	https://github.com/google/kmsan.git master	beaab8a3	3e5d1beb	.config	log	report	syz	C
ci-upstream-kmsan-gce	2019/07/01 11:37	https://github.com/google/kmsan.git master	41550654	699d6448	.config	log	report	syz	C
ci-upstream-kmsan-gce	2019/08/02 03:52	https://github.com/google/kmsan.git master	beaab8a3	835dffe7	.config	log	report
ci-upstream-kmsan-gce	2019/08/02 02:28	https://github.com/google/kmsan.git master	beaab8a3	835dffe7	.config	log	report
ci-upstream-kmsan-gce	2019/08/01 21:24	https://github.com/google/kmsan.git master	beaab8a3	835dffe7	.config	log	report
ci-upstream-kmsan-gce	2019/07/29 19:40	https://github.com/google/kmsan.git master	beaab8a3	f67095ee	.config	log	report
ci-upstream-kmsan-gce	2019/07/29 19:32	https://github.com/google/kmsan.git master	beaab8a3	f67095ee	.config	log	report
ci-upstream-kmsan-gce	2019/07/24 19:23	https://github.com/google/kmsan.git master	beaab8a3	32329ceb	.config	log	report
ci-upstream-kmsan-gce	2019/07/23 05:58	https://github.com/google/kmsan.git master	beaab8a3	55e0c077	.config	log	report
ci-upstream-kmsan-gce	2019/07/22 18:01	https://github.com/google/kmsan.git master	beaab8a3	b3c615f5	.config	log	report
ci-upstream-kmsan-gce	2019/07/19 18:49	https://github.com/google/kmsan.git master	beaab8a3	1656845f	.config	log	report
ci-upstream-kmsan-gce	2019/07/19 17:56	https://github.com/google/kmsan.git master	beaab8a3	1656845f	.config	log	report
ci-upstream-kmsan-gce	2019/07/17 18:06	https://github.com/google/kmsan.git master	beaab8a3	f613a7c4	.config	log	report
ci-upstream-kmsan-gce	2019/07/09 20:20	https://github.com/google/kmsan.git master	fe36eb20	f62e1e85	.config	log	report
ci-upstream-kmsan-gce	2019/07/09 19:58	https://github.com/google/kmsan.git master	fe36eb20	f62e1e85	.config	log	report
ci-upstream-kmsan-gce	2019/07/01 11:07	https://github.com/google/kmsan.git master	41550654	699d6448	.config	log	report
ci-upstream-kmsan-gce	2019/06/05 15:27	https://github.com/google/kmsan.git master	f75e4cfe	bfb4a51e	.config	log	report