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BUG: KASAN: slab-out-of-bounds in technisat_usb2_get_ir /drivers/media/usb/dvb-usb/technisat-usb2.c:664 [inline]
BUG: KASAN: slab-out-of-bounds in technisat_usb2_rc_query+0x5f5/0x650 /drivers/media/usb/dvb-usb/technisat-usb2.c:679
Read of size 1 at addr ffff8881b0241368 by task kworker/0:5/2835

CPU: 0 PID: 2835 Comm: kworker/0:5 Not tainted 5.2.0-rc6+ #15
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events dvb_usb_read_remote_control
Call Trace:
 __dump_stack /lib/dump_stack.c:77 [inline]
 dump_stack+0xca/0x13e /lib/dump_stack.c:113
 print_address_description+0x67/0x231 /mm/kasan/report.c:188
 __kasan_report.cold+0x1a/0x32 /mm/kasan/report.c:317
 kasan_report+0xe/0x20 /mm/kasan/common.c:614
 technisat_usb2_get_ir /drivers/media/usb/dvb-usb/technisat-usb2.c:664 [inline]
 technisat_usb2_rc_query+0x5f5/0x650 /drivers/media/usb/dvb-usb/technisat-usb2.c:679
 dvb_usb_read_remote_control+0xdb/0x1b0 /drivers/media/usb/dvb-usb/dvb-usb-remote.c:261
 process_one_work+0x905/0x1570 /kernel/workqueue.c:2269
 worker_thread+0x96/0xe20 /kernel/workqueue.c:2415
 kthread+0x30b/0x410 /kernel/kthread.c:255
 ret_from_fork+0x24/0x30 /arch/x86/entry/entry_64.S:352

Allocated by task 12:
 save_stack+0x1b/0x80 /mm/kasan/common.c:71
 set_track /mm/kasan/common.c:79 [inline]
 __kasan_kmalloc /mm/kasan/common.c:489 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 /mm/kasan/common.c:462
 dvb_usb_init /drivers/media/usb/dvb-usb/dvb-usb-init.c:149 [inline]
 dvb_usb_device_init.cold+0x317/0x10aa /drivers/media/usb/dvb-usb/dvb-usb-init.c:274
 technisat_usb2_probe+0x7d/0x2c0 /drivers/media/usb/dvb-usb/technisat-usb2.c:763
 usb_probe_interface+0x305/0x7a0 /drivers/usb/core/driver.c:361
 really_probe+0x281/0x660 /drivers/base/dd.c:509
 driver_probe_device+0x104/0x210 /drivers/base/dd.c:670
 __device_attach_driver+0x1c2/0x220 /drivers/base/dd.c:777
 bus_for_each_drv+0x15c/0x1e0 /drivers/base/bus.c:454
 __device_attach+0x217/0x360 /drivers/base/dd.c:843
 bus_probe_device+0x1e4/0x290 /drivers/base/bus.c:514
 device_add+0xae6/0x16f0 /drivers/base/core.c:2111
 usb_set_configuration+0xdf6/0x1670 /drivers/usb/core/message.c:2023
 generic_probe+0x9d/0xd5 /drivers/usb/core/generic.c:210
 usb_probe_device+0x99/0x100 /drivers/usb/core/driver.c:266
 really_probe+0x281/0x660 /drivers/base/dd.c:509
 driver_probe_device+0x104/0x210 /drivers/base/dd.c:670
 __device_attach_driver+0x1c2/0x220 /drivers/base/dd.c:777
 bus_for_each_drv+0x15c/0x1e0 /drivers/base/bus.c:454
 __device_attach+0x217/0x360 /drivers/base/dd.c:843
 bus_probe_device+0x1e4/0x290 /drivers/base/bus.c:514
 device_add+0xae6/0x16f0 /drivers/base/core.c:2111
 usb_new_device.cold+0x6a4/0xe61 /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+0x1abd/0x3550 /drivers/usb/core/hub.c:5441
 process_one_work+0x905/0x1570 /kernel/workqueue.c:2269
 worker_thread+0x96/0xe20 /kernel/workqueue.c:2415
 kthread+0x30b/0x410 /kernel/kthread.c:255
 ret_from_fork+0x24/0x30 /arch/x86/entry/entry_64.S:352

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8881b0241280
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 232 bytes inside of
 256-byte region [ffff8881b0241280, ffff8881b0241380)
The buggy address belongs to the page:
page:ffffea0006c09040 refcount:1 mapcount:0 mapping:ffff8881dac02e00 index:0x0
flags: 0x200000000000200(slab)
raw: 0200000000000200 dead000000000100 dead000000000200 ffff8881dac02e00
raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881b0241200: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
 ffff8881b0241280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881b0241300: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc
                                                          ^
 ffff8881b0241380: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
 ffff8881b0241400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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