gspca_main: sq905-2.14.0 probing 2770:9120
=====================================================
BUG: KMSAN: uninit-value in number+0x32e/0x1e40 lib/vsprintf.c:436
CPU: 0 PID: 31042 Comm: kworker/0:2 Not tainted 5.4.0-rc5+ #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+0x191/0x1f0 lib/dump_stack.c:113
 kmsan_report+0x128/0x220 mm/kmsan/kmsan_report.c:108
 __msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:245
 number+0x32e/0x1e40 lib/vsprintf.c:436
 vsnprintf+0x1e99/0x3210 lib/vsprintf.c:2576
 vscnprintf+0xc2/0x180 lib/vsprintf.c:2613
 vprintk_store+0xef/0x11e0 kernel/printk/printk.c:1921
 vprintk_emit+0x2fd/0x8d0 kernel/printk/printk.c:1984
 vprintk_default+0x90/0xa0 kernel/printk/printk.c:2029
 vprintk_func+0x635/0x810 kernel/printk/printk_safe.c:386
 printk+0x180/0x1c3 kernel/printk/printk.c:2062
 sq905_read_data+0x61e/0x640 drivers/media/usb/gspca/sq905.c:184
 sd_init+0x15a/0x4c0 drivers/media/usb/gspca/sq905.c:329
 gspca_dev_probe2+0xe93/0x2230 drivers/media/usb/gspca/gspca.c:1532
 gspca_dev_probe+0x346/0x3b0 drivers/media/usb/gspca/gspca.c:1605
 sd_probe+0x8d/0xa0 drivers/media/usb/gspca/gl860/gl860.c:511
 usb_probe_interface+0xd19/0x1310 drivers/usb/core/driver.c:361
 really_probe+0xd91/0x1f90 drivers/base/dd.c:552
 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:721
 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:828
 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:430
 __device_attach+0x489/0x750 drivers/base/dd.c:894
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:941
 bus_probe_device+0x131/0x390 drivers/base/bus.c:490
 device_add+0x25b5/0x2df0 drivers/base/core.c:2202
 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+0xd91/0x1f90 drivers/base/dd.c:552
 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:721
 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:828
 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:430
 __device_attach+0x489/0x750 drivers/base/dd.c:894
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:941
 bus_probe_device+0x131/0x390 drivers/base/bus.c:490
 device_add+0x25b5/0x2df0 drivers/base/core.c:2202
 usb_new_device+0x23e5/0x2fb0 drivers/usb/core/hub.c:2536
 hub_port_connect drivers/usb/core/hub.c:5098 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
 port_event drivers/usb/core/hub.c:5359 [inline]
 hub_event+0x581d/0x72f0 drivers/usb/core/hub.c:5441
 process_one_work+0x1572/0x1ef0 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: ----act_len@sq905_read_data
Variable was created at:
 sq905_read_data+0x91/0x640 drivers/media/usb/gspca/sq905.c:163
 sq905_read_data+0x91/0x640 drivers/media/usb/gspca/sq905.c:163
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