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BUG: KASAN: slab-out-of-bounds in mceusb_handle_command drivers/media/rc/mceusb.c:1146 [inline]
BUG: KASAN: slab-out-of-bounds in mceusb_process_ir_data drivers/media/rc/mceusb.c:1238 [inline]
BUG: KASAN: slab-out-of-bounds in mceusb_dev_recv+0x101e/0x12e0 drivers/media/rc/mceusb.c:1321
Read of size 1 at addr ffff8881ce39e9c0 by task syz-executor.1/3368

CPU: 1 PID: 3368 Comm: syz-executor.1 Not tainted 5.4.0-rc1+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0xca/0x13e lib/dump_stack.c:113
 print_address_description.constprop.0+0x36/0x50 mm/kasan/report.c:374
 __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:506
 kasan_report+0xe/0x20 mm/kasan/common.c:634
 mceusb_handle_command drivers/media/rc/mceusb.c:1146 [inline]
 mceusb_process_ir_data drivers/media/rc/mceusb.c:1238 [inline]
 mceusb_dev_recv+0x101e/0x12e0 drivers/media/rc/mceusb.c:1321
 __usb_hcd_giveback_urb+0x1f2/0x470 drivers/usb/core/hcd.c:1654
 usb_hcd_giveback_urb+0x368/0x420 drivers/usb/core/hcd.c:1719
 dummy_timer+0x120f/0x2fa2 drivers/usb/gadget/udc/dummy_hcd.c:1965
 call_timer_fn+0x179/0x650 kernel/time/timer.c:1404
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers kernel/time/timer.c:1773 [inline]
 __run_timers kernel/time/timer.c:1740 [inline]
 run_timer_softirq+0x5e3/0x1490 kernel/time/timer.c:1786
 __do_softirq+0x221/0x912 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x178/0x1a0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x12f/0x500 arch/x86/kernel/apic/apic.c:1137
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
 </IRQ>
RIP: 0010:check_memory_region+0xfa/0x190 mm/kasan/generic.c:193
Code: 0c 1c eb 0c 49 83 c0 01 4c 89 c8 4d 39 c8 74 0f 41 80 38 00 74 ee 49 8d 04 1c 4d 85 c0 75 2f 49 89 e9 49 29 c1 e9 6c ff ff ff <5b> b8 01 00 00 00 5d 41 5c c3 4d 85 c9 74 f1 49 01 d9 eb 09 48 83
RSP: 0018:ffff8881cf32f740 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: fffff94000de0501 RBX: fffff94000de0500 RCX: ffffffff8159aa4a
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffea0006f02800
RBP: fffff94000de0501 R08: ffff8881c6ee8000 R09: fffff94000de0501
R10: fffff94000de0500 R11: ffffea0006f02807 R12: ffffea0006f02800
R13: ffff8881cf32fa20 R14: dffffc0000000000 R15: ffffea0006f02800
 test_bit include/asm-generic/bitops-instrumented.h:237 [inline]
 PageSlab include/linux/page-flags.h:325 [inline]
 page_mapcount include/linux/mm.h:724 [inline]
 zap_pte_range mm/memory.c:1063 [inline]
 zap_pmd_range mm/memory.c:1166 [inline]
 zap_pud_range mm/memory.c:1195 [inline]
 zap_p4d_range mm/memory.c:1216 [inline]
 unmap_page_range+0xbda/0x1a00 mm/memory.c:1237
 unmap_single_vma+0x196/0x300 mm/memory.c:1282
 unmap_vmas+0x179/0x300 mm/memory.c:1314
 exit_mmap+0x278/0x4d0 mm/mmap.c:3161
 __mmput kernel/fork.c:1079 [inline]
 mmput+0xce/0x3d0 kernel/fork.c:1100
 exit_mm kernel/exit.c:485 [inline]
 do_exit+0x7f8/0x2c00 kernel/exit.c:804
 do_group_exit+0x125/0x340 kernel/exit.c:921
 get_signal+0x466/0x23d0 kernel/signal.c:2734
 do_signal+0x88/0x14e0 arch/x86/kernel/signal.c:815
 exit_to_usermode_loop+0x1a2/0x200 arch/x86/entry/common.c:159
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x45f/0x580 arch/x86/entry/common.c:300
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459a59
Code: Bad RIP value.
RSP: 002b:00007f93759eacf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000075bfd0 RCX: 0000000000459a59
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075bfd0
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075bfd4
R13: 00007ffca41a530f R14: 00007f93759eb9c0 R15: 000000000075bfd4

Allocated by task 2806:
 save_stack+0x1b/0x80 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc mm/kasan/common.c:510 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:483
 kmalloc include/linux/slab.h:557 [inline]
 hcd_buffer_alloc+0x1ed/0x290 drivers/usb/core/buffer.c:132
 usb_alloc_coherent+0x5d/0x80 drivers/usb/core/usb.c:910
 mceusb_dev_probe+0x714/0x2f51 drivers/media/rc/mceusb.c:1674
 usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
 really_probe+0x281/0x6d0 drivers/base/dd.c:548
 driver_probe_device+0x104/0x210 drivers/base/dd.c:721
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
 __device_attach+0x217/0x360 drivers/base/dd.c:894
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
 device_add+0xae6/0x16f0 drivers/base/core.c:2201
 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+0x281/0x6d0 drivers/base/dd.c:548
 driver_probe_device+0x104/0x210 drivers/base/dd.c:721
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
 __device_attach+0x217/0x360 drivers/base/dd.c:894
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
 device_add+0xae6/0x16f0 drivers/base/core.c:2201
 usb_new_device.cold+0x6a4/0xe79 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+0x1b5c/0x3640 drivers/usb/core/hub.c:5441
 process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
 process_scheduled_works kernel/workqueue.c:2331 [inline]
 worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417
 kthread+0x318/0x420 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Freed by task 12:
 save_stack+0x1b/0x80 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 kasan_set_free_info mm/kasan/common.c:332 [inline]
 __kasan_slab_free+0x130/0x180 mm/kasan/common.c:471
 slab_free_hook mm/slub.c:1424 [inline]
 slab_free_freelist_hook mm/slub.c:1475 [inline]
 slab_free mm/slub.c:3018 [inline]
 kfree+0xe4/0x2f0 mm/slub.c:3959
 kobject_cleanup lib/kobject.c:693 [inline]
 kobject_release lib/kobject.c:722 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x171/0x280 lib/kobject.c:739
 put_device drivers/base/core.c:2300 [inline]
 device_unregister+0x23/0x30 drivers/base/core.c:2408
 i2c_del_adapter drivers/i2c/i2c-core-base.c:1594 [inline]
 i2c_del_adapter+0x42b/0x590 drivers/i2c/i2c-core-base.c:1533
 dvb_usb_i2c_exit+0x97/0xdd drivers/media/usb/dvb-usb/dvb-usb-i2c.c:41
 dvb_usb_exit+0x155/0x290 drivers/media/usb/dvb-usb/dvb-usb-init.c:130
 dvb_usb_device_exit+0x111/0x1a0 drivers/media/usb/dvb-usb/dvb-usb-init.c:306
 usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423
 __device_release_driver drivers/base/dd.c:1134 [inline]
 device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1165
 bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:532
 device_del+0x420/0xb20 drivers/base/core.c:2375
 usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237
 usb_disconnect+0x284/0x8d0 drivers/usb/core/hub.c:2199
 hub_port_connect drivers/usb/core/hub.c:4949 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
 port_event drivers/usb/core/hub.c:5359 [inline]
 hub_event+0x1454/0x3640 drivers/usb/core/hub.c:5441
 process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
 worker_thread+0x96/0xe20 kernel/workqueue.c:2415
 kthread+0x318/0x420 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

The buggy address belongs to the object at ffff8881ce39e8c0
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 0 bytes to the right of
 256-byte region [ffff8881ce39e8c0, ffff8881ce39e9c0)
The buggy address belongs to the page:
page:ffffea000738e780 refcount:1 mapcount:0 mapping:ffff8881da002780 index:0x0
flags: 0x200000000000200(slab)
raw: 0200000000000200 ffffea0007386840 0000000800000008 ffff8881da002780
raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881ce39e880: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
 ffff8881ce39e900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881ce39e980: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
                                           ^
 ffff8881ce39ea00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881ce39ea80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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