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BUG: KASAN: slab-out-of-bounds in technisat_usb2_rc_query+0x5f5/0x650
Read of size 1 at addr ffff8881d8b36868 by task kworker/0:2/2529

CPU: 0 PID: 2529 Comm: kworker/0:2 Not tainted 5.1.0-rc3+ #7
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+0xca/0x13e
 print_address_description+0x67/0x231
 kasan_report.cold+0x1a/0x35
 technisat_usb2_rc_query+0x5f5/0x650
 dvb_usb_read_remote_control+0xe0/0x1c0
 process_one_work+0x90a/0x1580
 worker_thread+0x96/0xe20
 kthread+0x30e/0x420
 ret_from_fork+0x3a/0x50

Allocated by task 12:
 __kasan_kmalloc.constprop.0+0xbf/0xd0
 dvb_usb_device_init.cold+0x463/0x11ae
 technisat_usb2_probe+0x7d/0x2c0
 usb_probe_interface+0x30d/0x7b0
 really_probe+0x296/0x680
 driver_probe_device+0xf9/0x200
 __device_attach_driver+0x1c4/0x230
 bus_for_each_drv+0x15e/0x1e0
 __device_attach+0x21e/0x360
 bus_probe_device+0x1ec/0x2a0
 device_add+0xaf4/0x1700
 usb_set_configuration+0xdf2/0x1670
 generic_probe+0x9d/0xd5
 usb_probe_device+0xa8/0x110
 really_probe+0x296/0x680
 driver_probe_device+0xf9/0x200
 __device_attach_driver+0x1c4/0x230
 bus_for_each_drv+0x15e/0x1e0
 __device_attach+0x21e/0x360
 bus_probe_device+0x1ec/0x2a0
 device_add+0xaf4/0x1700
 usb_new_device.cold+0x8b8/0x1030
 hub_event+0x1ac9/0x35a0
 process_one_work+0x90a/0x1580
 worker_thread+0x96/0xe20
 kthread+0x30e/0x420
 ret_from_fork+0x3a/0x50

Freed by task 1:
 __kasan_slab_free+0x130/0x180
 kfree+0xd7/0x290
 krealloc+0x78/0xc0
 add_sysfs_param.isra.0+0xc8/0x930
 param_sysfs_init+0x35f/0x430
 do_one_initcall+0xd9/0x585
 kernel_init_freeable+0x4b4/0x5a1
 kernel_init+0xd/0x1bf
 ret_from_fork+0x3a/0x50

The buggy address belongs to the object at ffff8881d8b36780
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 232 bytes inside of
 256-byte region [ffff8881d8b36780, ffff8881d8b36880)
The buggy address belongs to the page:
page:ffffea000762cd80 count: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:
 ffff8881d8b36700: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
 ffff8881d8b36780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881d8b36800: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc
                                                          ^
 ffff8881d8b36880: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
 ffff8881d8b36900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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