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SubjectKMSAN: uninit-value in mts_usb_probe
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Hello,

syzbot found the following crash on:

HEAD commit: fe36eb20 kmsan: rework SLUB hooks
git tree: https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=17605b6fa00000
kernel config: https://syzkaller.appspot.com/x/.config?x=40511ad0c5945201
dashboard link: https://syzkaller.appspot.com/bug?extid=5630ca7c3b2be5c9da5e
compiler: clang version 9.0.0 (/home/glider/llvm/clang
80fee25776c2fb61e74c1ecb1a523375c2500b69)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11305710600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1506787fa00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+5630ca7c3b2be5c9da5e@syzkaller.appspotmail.com

usb 1-1: config 0 interface 235 altsetting 0 bulk endpoint 0x5 has invalid
maxpacket 0
usb 1-1: New USB device found, idVendor=05da, idProduct=009a,
bcdDevice=46.6b
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
microtek usb (rev 0.4.3): can only deal with bulk endpoints; endpoint 15 is
not bulk.
microtek usb (rev 0.4.3): can only deal with bulk endpoints; endpoint 10 is
not bulk.
microtek usb (rev 0.4.3): will this work? Command EP is not usually 5
==================================================================
BUG: KMSAN: uninit-value in mts_usb_probe+0xd1d/0xfb0
drivers/usb/image/microtek.c:754
CPU: 1 PID: 33 Comm: kworker/1:1 Not tainted 5.2.0-rc4+ #11
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
mts_usb_probe+0xd1d/0xfb0 drivers/usb/image/microtek.c:754
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

Uninit was stored to memory at:
kmsan_save_stack_with_flags mm/kmsan/kmsan.c:187 [inline]
kmsan_internal_chain_origin+0xcc/0x150 mm/kmsan/kmsan.c:349
__msan_chain_origin+0x6b/0xe0 mm/kmsan/kmsan_instr.c:190
mts_usb_probe+0xcf7/0xfb0 drivers/usb/image/microtek.c:748
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: ----ep_in_set@mts_usb_probe
Variable was created at:
mts_usb_probe+0x53/0xfb0 drivers/usb/image/microtek.c:666
usb_probe_interface+0xd19/0x1310 drivers/usb/core/driver.c:361
==================================================================


---
This bug 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@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

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