syzbot


KMSAN: uninit-value in asix_mdio_write_nopm

Status: upstream: reported on 2022/03/15 15:26
Reported-by: syzbot+737f7d251877e50f3dce@syzkaller.appspotmail.com
Fix commit: 920a9fa27e78 net: asix: add proper error handling of usb read errors
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-leak ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce ci-upstream-kmsan-gce-386 ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu2-riscv64]
First crash: 105d, last: 84d

Sample crash report:
asix 4-1:0.0 (unnamed net_device) (uninitialized): Failed to read reg index 0x0000: -71
asix 4-1:0.0 (unnamed net_device) (uninitialized): Failed to write reg index 0x0000: -71
asix 4-1:0.0 (unnamed net_device) (uninitialized): Failed to enable software MII access
asix 4-1:0.0 (unnamed net_device) (uninitialized): Failed to read reg index 0x0000: -71
=====================================================
BUG: KMSAN: uninit-value in asix_check_host_enable drivers/net/usb/asix_common.c:84 [inline]
BUG: KMSAN: uninit-value in asix_mdio_write_nopm+0x556/0x9d0 drivers/net/usb/asix_common.c:605
 asix_check_host_enable drivers/net/usb/asix_common.c:84 [inline]
 asix_mdio_write_nopm+0x556/0x9d0 drivers/net/usb/asix_common.c:605
 ax88772a_hw_reset+0xa67/0x12e0 drivers/net/usb/asix_devices.c:524
 ax88772_bind+0x750/0x1770 drivers/net/usb/asix_devices.c:762
 usbnet_probe+0x1251/0x4160 drivers/net/usb/usbnet.c:1747
 usb_probe_interface+0xf19/0x1600 drivers/usb/core/driver.c:396
 really_probe+0x653/0x14b0 drivers/base/dd.c:596
 __driver_probe_device+0x3e9/0x530 drivers/base/dd.c:755
 driver_probe_device drivers/base/dd.c:785 [inline]
 __device_attach_driver+0x79f/0x1120 drivers/base/dd.c:902
 bus_for_each_drv+0x2d6/0x3f0 drivers/base/bus.c:427
 __device_attach+0x593/0x8e0 drivers/base/dd.c:973
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:1020
 bus_probe_device+0x17b/0x3e0 drivers/base/bus.c:487
 device_add+0x1fff/0x26e0 drivers/base/core.c:3405
 usb_set_configuration+0x37e9/0x3ed0 drivers/usb/core/message.c:2170
 usb_generic_driver_probe+0x13c/0x300 drivers/usb/core/generic.c:238
 usb_probe_device+0x309/0x570 drivers/usb/core/driver.c:293
 really_probe+0x653/0x14b0 drivers/base/dd.c:596
 __driver_probe_device+0x3e9/0x530 drivers/base/dd.c:755
 driver_probe_device drivers/base/dd.c:785 [inline]
 __device_attach_driver+0x79f/0x1120 drivers/base/dd.c:902
 bus_for_each_drv+0x2d6/0x3f0 drivers/base/bus.c:427
 __device_attach+0x593/0x8e0 drivers/base/dd.c:973
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:1020
 bus_probe_device+0x17b/0x3e0 drivers/base/bus.c:487
 device_add+0x1fff/0x26e0 drivers/base/core.c:3405
 usb_new_device+0x1b8e/0x2950 drivers/usb/core/hub.c:2566
 hub_port_connect drivers/usb/core/hub.c:5358 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5502 [inline]
 port_event drivers/usb/core/hub.c:5660 [inline]
 hub_event+0x58e3/0x89e0 drivers/usb/core/hub.c:5742
 process_one_work+0xdb6/0x1820 kernel/workqueue.c:2307
 worker_thread+0x10b3/0x21e0 kernel/workqueue.c:2454
 kthread+0x3c7/0x500 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30

Local variable smsr.i created at:
 asix_mdio_write_nopm+0xe7/0x9d0 drivers/net/usb/asix_common.c:605
 ax88772a_hw_reset+0xa67/0x12e0 drivers/net/usb/asix_devices.c:524

CPU: 1 PID: 3561 Comm: kworker/1:7 Not tainted 5.17.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
=====================================================

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kmsan-gce 2022/04/05 09:19 https://github.com/google/kmsan.git master 33d9269ef6e0 5915c2cb .config log report info KMSAN: uninit-value in asix_mdio_write_nopm
ci-upstream-kmsan-gce 2022/03/15 13:39 https://github.com/google/kmsan.git master 724946410067 9e8eaa75 .config log report info KMSAN: uninit-value in asix_mdio_write_nopm