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=11212a66900000 kernel config: https://syzkaller.appspot.com/x/.config?x=3afe005fb99591f dashboard link: https://syzkaller.appspot.com/bug?extid=4993e4a0e237f1b53747 compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12ceb4b6900000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1645f266900000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4993e4a0e237f1b53747@xxxxxxxxxxxxxxxxxxxxxxxxx ax88179_178a 1-1:101.123 (unnamed net_device) (uninitialized): Failed to write reg index 0x0002: -71 ax88179_178a 1-1:101.123 (unnamed net_device) (uninitialized): Failed to write reg index 0x0002: -71 ax88179_178a 1-1:101.123 (unnamed net_device) (uninitialized): Failed to write reg index 0x0001: -71 ax88179_178a 1-1:101.123 (unnamed net_device) (uninitialized): Failed to read reg index 0x0006: -71 ===================================================== BUG: KMSAN: uninit-value in is_valid_ether_addr include/linux/etherdevice.h:195 [inline] BUG: KMSAN: uninit-value in ax88179_get_mac_addr+0x481/0x850 drivers/net/usb/ax88179_178a.c:1310 CPU: 0 PID: 3337 Comm: kworker/0:2 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 is_valid_ether_addr include/linux/etherdevice.h:195 [inline] ax88179_get_mac_addr+0x481/0x850 drivers/net/usb/ax88179_178a.c:1310 ax88179_bind+0x3ec/0x19c0 drivers/net/usb/ax88179_178a.c:1348 usbnet_probe+0x1152/0x3f90 drivers/net/usb/usbnet.c:1737 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 ----mac@ax88179_get_mac_addr created at: ax88179_get_mac_addr+0x4d/0x850 drivers/net/usb/ax88179_178a.c:1297 ax88179_get_mac_addr+0x4d/0x850 drivers/net/usb/ax88179_178a.c:1297 ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
