KMSAN: uninit-value in batadv_hard_if_event (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: ce8056d1 wip: changed copy_from_user where instrumented
git tree: https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=106e4c3c900000
kernel config: https://syzkaller.appspot.com/x/.config?x=3afe005fb99591f
dashboard link: https://syzkaller.appspot.com/bug?extid=abbc768b560c84d92fd3
compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
userspace arch: i386

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+abbc76...@syzkaller.appspotmail.com

usb 1-1: config 0 descriptor??
=====================================================
BUG: KMSAN: uninit-value in batadv_check_known_mac_addr net/batman-adv/hard-interface.c:512 [inline]
BUG: KMSAN: uninit-value in batadv_hardif_add_interface net/batman-adv/hard-interface.c:944 [inline]
BUG: KMSAN: uninit-value in batadv_hard_if_event+0x28d7/0x3bd0 net/batman-adv/hard-interface.c:1034
CPU: 0 PID: 8697 Comm: kworker/0:3 Not tainted 5.8.0-rc5-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:121
__msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
batadv_check_known_mac_addr net/batman-adv/hard-interface.c:512 [inline]
batadv_hardif_add_interface net/batman-adv/hard-interface.c:944 [inline]
batadv_hard_if_event+0x28d7/0x3bd0 net/batman-adv/hard-interface.c:1034
notifier_call_chain kernel/notifier.c:83 [inline]
__raw_notifier_call_chain kernel/notifier.c:361 [inline]
raw_notifier_call_chain+0x123/0x290 kernel/notifier.c:368
call_netdevice_notifiers_info net/core/dev.c:2027 [inline]
call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
call_netdevice_notifiers net/core/dev.c:2053 [inline]
register_netdevice+0x3120/0x37d0 net/core/dev.c:9545
register_netdev+0xbe/0x100 net/core/dev.c:9645
rtl8150_probe+0x12d9/0x15b0 drivers/net/usb/rtl8150.c:916
usb_probe_interface+0xece/0x1550 drivers/usb/core/driver.c:374
really_probe+0xf20/0x20b0 drivers/base/dd.c:529
driver_probe_device+0x293/0x390 drivers/base/dd.c:701
__device_attach_driver+0x63f/0x830 drivers/base/dd.c:807
bus_for_each_drv+0x2ca/0x3f0 drivers/base/bus.c:431
__device_attach+0x4e2/0x7f0 drivers/base/dd.c:873
device_initial_probe+0x4a/0x60 drivers/base/dd.c:920
bus_probe_device+0x177/0x3d0 drivers/base/bus.c:491
device_add+0x3b0e/0x40d0 drivers/base/core.c:2680
usb_set_configuration+0x380f/0x3f10 drivers/usb/core/message.c:2032
usb_generic_driver_probe+0x138/0x300 drivers/usb/core/generic.c:241
usb_probe_device+0x311/0x490 drivers/usb/core/driver.c:272
really_probe+0xf20/0x20b0 drivers/base/dd.c:529
driver_probe_device+0x293/0x390 drivers/base/dd.c:701
__device_attach_driver+0x63f/0x830 drivers/base/dd.c:807
bus_for_each_drv+0x2ca/0x3f0 drivers/base/bus.c:431
__device_attach+0x4e2/0x7f0 drivers/base/dd.c:873
device_initial_probe+0x4a/0x60 drivers/base/dd.c:920
bus_probe_device+0x177/0x3d0 drivers/base/bus.c:491
device_add+0x3b0e/0x40d0 drivers/base/core.c:2680
usb_new_device+0x1bd4/0x2a30 drivers/usb/core/hub.c:2554
hub_port_connect drivers/usb/core/hub.c:5208 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5348 [inline]
port_event drivers/usb/core/hub.c:5494 [inline]
hub_event+0x5e7b/0x8a70 drivers/usb/core/hub.c:5576
process_one_work+0x1688/0x2140 kernel/workqueue.c:2269
worker_thread+0x10bc/0x2730 kernel/workqueue.c:2415
kthread+0x551/0x590 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

Uninit was stored to memory at:
kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310
kmsan_memcpy_memmove_metadata+0x272/0x2e0 mm/kmsan/kmsan.c:247
kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:267
__msan_memcpy+0x43/0x50 mm/kmsan/kmsan_instr.c:116
set_ethernet_addr drivers/net/usb/rtl8150.c:282 [inline]
rtl8150_probe+0x1236/0x15b0 drivers/net/usb/rtl8150.c:912
usb_probe_interface+0xece/0x1550 drivers/usb/core/driver.c:374
really_probe+0xf20/0x20b0 drivers/base/dd.c:529
driver_probe_device+0x293/0x390 drivers/base/dd.c:701
__device_attach_driver+0x63f/0x830 drivers/base/dd.c:807
bus_for_each_drv+0x2ca/0x3f0 drivers/base/bus.c:431
__device_attach+0x4e2/0x7f0 drivers/base/dd.c:873
device_initial_probe+0x4a/0x60 drivers/base/dd.c:920
bus_probe_device+0x177/0x3d0 drivers/base/bus.c:491
device_add+0x3b0e/0x40d0 drivers/base/core.c:2680
usb_set_configuration+0x380f/0x3f10 drivers/usb/core/message.c:2032
usb_generic_driver_probe+0x138/0x300 drivers/usb/core/generic.c:241
usb_probe_device+0x311/0x490 drivers/usb/core/driver.c:272
really_probe+0xf20/0x20b0 drivers/base/dd.c:529
driver_probe_device+0x293/0x390 drivers/base/dd.c:701
__device_attach_driver+0x63f/0x830 drivers/base/dd.c:807
bus_for_each_drv+0x2ca/0x3f0 drivers/base/bus.c:431
__device_attach+0x4e2/0x7f0 drivers/base/dd.c:873
device_initial_probe+0x4a/0x60 drivers/base/dd.c:920
bus_probe_device+0x177/0x3d0 drivers/base/bus.c:491
device_add+0x3b0e/0x40d0 drivers/base/core.c:2680
usb_new_device+0x1bd4/0x2a30 drivers/usb/core/hub.c:2554
hub_port_connect drivers/usb/core/hub.c:5208 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5348 [inline]
port_event drivers/usb/core/hub.c:5494 [inline]
hub_event+0x5e7b/0x8a70 drivers/usb/core/hub.c:5576
process_one_work+0x1688/0x2140 kernel/workqueue.c:2269
worker_thread+0x10bc/0x2730 kernel/workqueue.c:2415
kthread+0x551/0x590 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

Local variable ----node_id.i@rtl8150_probe created at:
get_registers drivers/net/usb/rtl8150.c:911 [inline]
set_ethernet_addr drivers/net/usb/rtl8150.c:281 [inline]
rtl8150_probe+0xea7/0x15b0 drivers/net/usb/rtl8150.c:912
get_registers drivers/net/usb/rtl8150.c:911 [inline]
set_ethernet_addr drivers/net/usb/rtl8150.c:281 [inline]
rtl8150_probe+0xea7/0x15b0 drivers/net/usb/rtl8150.c:912
=====================================================


---
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[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: ce8056d1 wip: changed copy_from_user where instrumented
git tree: https://github.com/google/kmsan.git master

console output: https://syzkaller.appspot.com/x/log.txt?x=1015b616900000

kernel config: https://syzkaller.appspot.com/x/.config?x=3afe005fb99591f
dashboard link: https://syzkaller.appspot.com/bug?extid=abbc768b560c84d92fd3
compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17837fba900000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1218cc16900000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+abbc76...@syzkaller.appspotmail.com

usb 1-1: new high-speed USB device number 2 using dummy_hcd
usb 1-1: New USB device found, idVendor=07b8, idProduct=401a, bcdDevice=3d.3d
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0

usb 1-1: config 0 descriptor??
=====================================================
BUG: KMSAN: uninit-value in batadv_check_known_mac_addr net/batman-adv/hard-interface.c:512 [inline]
BUG: KMSAN: uninit-value in batadv_hardif_add_interface net/batman-adv/hard-interface.c:944 [inline]
BUG: KMSAN: uninit-value in batadv_hard_if_event+0x28d7/0x3bd0 net/batman-adv/hard-interface.c:1034

CPU: 1 PID: 29 Comm: kworker/1:1 Not tainted 5.8.0-rc5-syzkaller #0