[syzbot] KMSAN: uninit-value in efuse_one_byte_read (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    cdfb223e7e63 kmsan: core: define KMSAN_BUG_ON
git tree:       https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=11ade575b00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e00a8959fdd3f3e8
dashboard link: https://syzkaller.appspot.com/bug?extid=1b535a057d0360bbcc56
compiler:       clang version 14.0.0 (git@xxxxxxxxxx:llvm/llvm-project.git 0996585c8e3b3d409494eb5f1cad714b9e1f7fb5), GNU ld (GNU Binutils for Debian) 2.35.2

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+1b535a057d0360bbcc56@xxxxxxxxxxxxxxxxxxxxxxxxx

usb 2-1: r8712u: Boot from EFUSE: Autoload OK
=====================================================
BUG: KMSAN: uninit-value in efuse_one_byte_read+0x20f/0x2e0 drivers/staging/rtl8712/rtl8712_efuse.c:76
 efuse_one_byte_read+0x20f/0x2e0 drivers/staging/rtl8712/rtl8712_efuse.c:76
 r8712_efuse_pg_packet_read+0x2bb/0xd80 drivers/staging/rtl8712/rtl8712_efuse.c:245
 r871xu_drv_init+0x1b90/0x2e90 drivers/staging/rtl8712/usb_intf.c:440
 usb_probe_interface+0xed9/0x14f0 drivers/usb/core/driver.c:396
 really_probe+0x66e/0x1510 drivers/base/dd.c:596
 __driver_probe_device+0x3e9/0x530 drivers/base/dd.c:751
 driver_probe_device drivers/base/dd.c:781 [inline]
 __device_attach_driver+0x79f/0x1120 drivers/base/dd.c:898
 bus_for_each_drv+0x2f0/0x410 drivers/base/bus.c:427
 __device_attach+0x593/0x8e0 drivers/base/dd.c:969
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:1016
 bus_probe_device+0x17b/0x3e0 drivers/base/bus.c:487
 device_add+0x1d46/0x2400 drivers/base/core.c:3394
 usb_set_configuration+0x389f/0x3ee0 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+0x66e/0x1510 drivers/base/dd.c:596
 __driver_probe_device+0x3e9/0x530 drivers/base/dd.c:751
 driver_probe_device drivers/base/dd.c:781 [inline]
 __device_attach_driver+0x79f/0x1120 drivers/base/dd.c:898
 bus_for_each_drv+0x2f0/0x410 drivers/base/bus.c:427
 __device_attach+0x593/0x8e0 drivers/base/dd.c:969
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:1016
 bus_probe_device+0x17b/0x3e0 drivers/base/bus.c:487
 device_add+0x1d46/0x2400 drivers/base/core.c:3394
 usb_new_device+0x1b9a/0x2960 drivers/usb/core/hub.c:2563
 hub_port_connect drivers/usb/core/hub.c:5353 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5497 [inline]
 port_event drivers/usb/core/hub.c:5643 [inline]
 hub_event+0x595e/0x8910 drivers/usb/core/hub.c:5725
 process_one_work+0xdc2/0x1820 kernel/workqueue.c:2298
 worker_thread+0x10f1/0x2290 kernel/workqueue.c:2445
 kthread+0x721/0x850 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30

Local variable data created at:
 usb_read8+0x5d/0x130 drivers/staging/rtl8712/usb_ops.c:33
 r8712_read8+0xa5/0xd0 drivers/staging/rtl8712/rtl8712_io.c:29

CPU: 1 PID: 20362 Comm: kworker/1:1 Not tainted 5.16.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
=====================================================


---
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.