KMSAN: uninit-value in gp8psk_power_ctrl

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit:    f75e4cfe kmsan: use kmsan_handle_urb() in urb.c
git tree:       https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=158867eea00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=602468164ccdc30a
dashboard link: https://syzkaller.appspot.com/bug?extid=fa2759b292234f21d29f
compiler:       clang version 9.0.0 (/home/glider/llvm/clang  
06d00afa61eef8f7f501ebdb4e8612ea43ec2d78)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13688dbaa00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10595a5aa00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+fa2759b292234f21d29f@xxxxxxxxxxxxxxxxxxxxxxxxx

usb 1-1: config 0 has an invalid interface number: 130 but max is 0
usb 1-1: config 0 has no interface number 0
usb 1-1: New USB device found, idVendor=09c0, idProduct=0206,  
bcdDevice=ce.c9
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
dvb-usb: found a 'Genpix SkyWalker-2 DVB-S receiver' in warm state.
gp8psk: usb in 128 operation failed.
==================================================================
BUG: KMSAN: uninit-value in gp8psk_power_ctrl+0x33e/0xca0  
drivers/media/usb/dvb-usb/gp8psk.c:193
CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.1.0+ #1
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+0x130/0x2a0 mm/kmsan/kmsan.c:622
 __msan_warning+0x75/0xe0 mm/kmsan/kmsan_instr.c:310
 gp8psk_power_ctrl+0x33e/0xca0 drivers/media/usb/dvb-usb/gp8psk.c:193
 dvb_usb_device_power_ctrl drivers/media/usb/dvb-usb/dvb-usb-init.c:226  
[inline]
 dvb_usb_init drivers/media/usb/dvb-usb/dvb-usb-init.c:160 [inline]
 dvb_usb_device_init+0x15ad/0x2cc0  
drivers/media/usb/dvb-usb/dvb-usb-init.c:277
 gp8psk_usb_probe+0xa2/0x190 drivers/media/usb/dvb-usb/gp8psk.c:307
 usb_probe_interface+0xd66/0x1320 drivers/usb/core/driver.c:361
 really_probe+0xdae/0x1d80 drivers/base/dd.c:513
 driver_probe_device+0x1b3/0x4f0 drivers/base/dd.c:671
 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:778
 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:454
 __device_attach+0x454/0x730 drivers/base/dd.c:844
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:891
 bus_probe_device+0x137/0x390 drivers/base/bus.c:514
 device_add+0x288d/0x30e0 drivers/base/core.c:2106
 usb_set_configuration+0x30dc/0x3750 drivers/usb/core/message.c:2027
 generic_probe+0xe7/0x280 drivers/usb/core/generic.c:210
 usb_probe_device+0x14c/0x200 drivers/usb/core/driver.c:266
 really_probe+0xdae/0x1d80 drivers/base/dd.c:513
 driver_probe_device+0x1b3/0x4f0 drivers/base/dd.c:671
 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:778
 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:454
 __device_attach+0x454/0x730 drivers/base/dd.c:844
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:891
 bus_probe_device+0x137/0x390 drivers/base/bus.c:514
 device_add+0x288d/0x30e0 drivers/base/core.c:2106
 usb_new_device+0x23e5/0x2ff0 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+0x48d1/0x7290 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:254
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355

Local variable description: ----status@gp8psk_power_ctrl
Variable was created at:
 gp8psk_power_ctrl+0x63/0xca0 drivers/media/usb/dvb-usb/gp8psk.c:188
 dvb_usb_device_power_ctrl drivers/media/usb/dvb-usb/dvb-usb-init.c:226  
[inline]
 dvb_usb_init drivers/media/usb/dvb-usb/dvb-usb-init.c:160 [inline]
 dvb_usb_device_init+0x15ad/0x2cc0  
drivers/media/usb/dvb-usb/dvb-usb-init.c:277
==================================================================


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