usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: string descriptor 0 read error: -71
usb 1-1: USB disconnect, device number 2
==================================================================
BUG: KASAN: slab-use-after-free in hdm_disconnect+0x5c/0xa0 drivers/most/most_usb.c:1123
Read at addr fcf0000008760b68 by task kworker/0:4/3649
Pointer tag: [fc], memory tag: [fe]

CPU: 0 UID: 0 PID: 3649 Comm: kworker/0:4 Not tainted syzkaller #0 PREEMPT 
Hardware name: linux,dummy-virt (DT)
Workqueue: usb_hub_wq hub_event
Call trace:
 show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x78/0x90 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x108/0x61c mm/kasan/report.c:482
 kasan_report+0x88/0xac mm/kasan/report.c:595
 report_tag_fault arch/arm64/mm/fault.c:326 [inline]
 do_tag_recovery arch/arm64/mm/fault.c:338 [inline]
 __do_kernel_fault+0x170/0x1c8 arch/arm64/mm/fault.c:380
 do_bad_area+0x68/0x78 arch/arm64/mm/fault.c:480
 do_tag_check_fault+0x34/0x44 arch/arm64/mm/fault.c:853
 do_mem_abort+0x44/0x94 arch/arm64/mm/fault.c:929
 el1_abort+0x44/0x68 arch/arm64/kernel/entry-common.c:325
 el1h_64_sync_handler+0x50/0xac arch/arm64/kernel/entry-common.c:459
 el1h_64_sync+0x6c/0x70 arch/arm64/kernel/entry.S:591
 hdm_disconnect+0x5c/0xa0 drivers/most/most_usb.c:1123 (P)
 usb_unbind_interface+0x78/0x2c0 drivers/usb/core/driver.c:458
 device_remove drivers/base/dd.c:571 [inline]
 device_remove+0x70/0x80 drivers/base/dd.c:563
 __device_release_driver drivers/base/dd.c:1274 [inline]
 device_release_driver_internal+0x1d4/0x230 drivers/base/dd.c:1297
 device_release_driver+0x18/0x24 drivers/base/dd.c:1320
 bus_remove_device+0xcc/0x10c drivers/base/bus.c:579
 device_del+0x14c/0x384 drivers/base/core.c:3878
 usb_disable_device+0xd8/0x1b0 drivers/usb/core/message.c:1418
 usb_disconnect+0xe0/0x300 drivers/usb/core/hub.c:2344
 hub_port_connect drivers/usb/core/hub.c:5406 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
 port_event drivers/usb/core/hub.c:5870 [inline]
 hub_event+0x91c/0x1570 drivers/usb/core/hub.c:5952
 process_one_work+0x178/0x2cc kernel/workqueue.c:3263
 process_scheduled_works kernel/workqueue.c:3346 [inline]
 worker_thread+0x250/0x358 kernel/workqueue.c:3427
 kthread+0x130/0x1fc kernel/kthread.c:463
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860

Allocated by task 3649:
 kasan_save_stack+0x3c/0x64 mm/kasan/common.c:56
 save_stack_info+0x40/0x158 mm/kasan/tags.c:106
 kasan_save_alloc_info+0x14/0x20 mm/kasan/tags.c:142
 poison_kmalloc_redzone mm/kasan/common.c:400 [inline]
 poison_kmalloc_redzone mm/kasan/common.c:373 [inline]
 __kasan_kmalloc+0xb4/0xb8 mm/kasan/common.c:417
 kasan_kmalloc include/linux/kasan.h:262 [inline]
 __kmalloc_cache_noprof+0x1b4/0x54c mm/slub.c:5755
 kmalloc_noprof include/linux/slab.h:957 [inline]
 kzalloc_noprof include/linux/slab.h:1094 [inline]
 hdm_probe+0x3c/0x498 drivers/most/most_usb.c:959
 usb_probe_interface+0xd4/0x2ac drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:581 [inline]
 really_probe+0xbc/0x298 drivers/base/dd.c:659
 __driver_probe_device+0x78/0x12c drivers/base/dd.c:801
 driver_probe_device+0x3c/0x10c drivers/base/dd.c:831
 __device_attach_driver+0xb8/0xf8 drivers/base/dd.c:959
 bus_for_each_drv+0x84/0xe0 drivers/base/bus.c:462
 __device_attach+0x9c/0x188 drivers/base/dd.c:1031
 device_initial_probe+0x14/0x20 drivers/base/dd.c:1080
 bus_probe_device+0xac/0xb0 drivers/base/bus.c:537
 device_add+0x5cc/0x79c drivers/base/core.c:3689
 usb_set_configuration+0x4e4/0x8d0 drivers/usb/core/message.c:2210
 usb_generic_driver_probe+0x60/0x88 drivers/usb/core/generic.c:250
 usb_probe_device+0x3c/0x118 drivers/usb/core/driver.c:291
 call_driver_probe drivers/base/dd.c:581 [inline]
 really_probe+0xbc/0x298 drivers/base/dd.c:659
 __driver_probe_device+0x78/0x12c drivers/base/dd.c:801
 driver_probe_device+0x3c/0x10c drivers/base/dd.c:831
 __device_attach_driver+0xb8/0xf8 drivers/base/dd.c:959
 bus_for_each_drv+0x84/0xe0 drivers/base/bus.c:462
 __device_attach+0x9c/0x188 drivers/base/dd.c:1031
 device_initial_probe+0x14/0x20 drivers/base/dd.c:1080
 bus_probe_device+0xac/0xb0 drivers/base/bus.c:537
 device_add+0x5cc/0x79c drivers/base/core.c:3689
 usb_new_device+0x27c/0x658 drivers/usb/core/hub.c:2694
 hub_port_connect drivers/usb/core/hub.c:5566 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
 port_event drivers/usb/core/hub.c:5870 [inline]
 hub_event+0xd88/0x1570 drivers/usb/core/hub.c:5952
 process_one_work+0x178/0x2cc kernel/workqueue.c:3263
 process_scheduled_works kernel/workqueue.c:3346 [inline]
 worker_thread+0x250/0x358 kernel/workqueue.c:3427
 kthread+0x130/0x1fc kernel/kthread.c:463
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860

Freed by task 3649:
 kasan_save_stack+0x3c/0x64 mm/kasan/common.c:56
 save_stack_info+0x40/0x158 mm/kasan/tags.c:106
 __kasan_save_free_info+0x18/0x24 mm/kasan/tags.c:147
 kasan_save_free_info mm/kasan/kasan.h:406 [inline]
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x80/0x84 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2530 [inline]
 slab_free mm/slub.c:6619 [inline]
 kfree+0x100/0x42c mm/slub.c:6826
 release_mdev+0x10/0x1c drivers/most/most_usb.c:932
 device_release+0x34/0x90 drivers/base/core.c:2565
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0xa4/0x114 lib/kobject.c:737
 put_device drivers/base/core.c:3797 [inline]
 device_unregister+0x24/0x34 drivers/base/core.c:3920
 most_deregister_interface+0xec/0xfc drivers/most/core.c:1402
 hdm_disconnect+0x5c/0xa0 drivers/most/most_usb.c:1123
 usb_unbind_interface+0x78/0x2c0 drivers/usb/core/driver.c:458
 device_remove drivers/base/dd.c:571 [inline]
 device_remove+0x70/0x80 drivers/base/dd.c:563
 __device_release_driver drivers/base/dd.c:1274 [inline]
 device_release_driver_internal+0x1d4/0x230 drivers/base/dd.c:1297
 device_release_driver+0x18/0x24 drivers/base/dd.c:1320
 bus_remove_device+0xcc/0x10c drivers/base/bus.c:579
 device_del+0x14c/0x384 drivers/base/core.c:3878
 usb_disable_device+0xd8/0x1b0 drivers/usb/core/message.c:1418
 usb_disconnect+0xe0/0x300 drivers/usb/core/hub.c:2344
 hub_port_connect drivers/usb/core/hub.c:5406 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
 port_event drivers/usb/core/hub.c:5870 [inline]
 hub_event+0x91c/0x1570 drivers/usb/core/hub.c:5952
 process_one_work+0x178/0x2cc kernel/workqueue.c:3263
 process_scheduled_works kernel/workqueue.c:3346 [inline]
 worker_thread+0x250/0x358 kernel/workqueue.c:3427
 kthread+0x130/0x1fc kernel/kthread.c:463
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860

The buggy address belongs to the object at fff0000008760000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 2920 bytes inside of
 4096-byte region [fff0000008760000, fff0000008761000)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xf9f0000008765000 pfn:0x48760
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x1ffc00000000040(head|node=0|zone=0|lastcpupid=0x7ff|kasantag=0x0)
page_type: f5(slab)
raw: 01ffc00000000040 f7f0000003001c00 dead000000000122 0000000000000000
raw: f9f0000008765000 0000000080080006 00000000f5000000 0000000000000000
head: 01ffc00000000040 f7f0000003001c00 dead000000000122 0000000000000000
head: f9f0000008765000 0000000080080006 00000000f5000000 0000000000000000
head: 01ffc00000000003 ffffc1ffc021d801 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 fff0000008760900: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
 fff0000008760a00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
>fff0000008760b00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
                                     ^
 fff0000008760c00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
 fff0000008760d00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
==================================================================
------------[ cut here ]------------
Unable to handle kernel paging request at virtual address 007267637a79732f
Mem abort info:
  ESR = 0x0000000096000004
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x04: level 0 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000
  CM = 0, WnR = 0, TnD = 0, TagAccess = 0
  GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[007267637a79732f] address between user and kernel address ranges
Internal error: Oops: 0000000096000004 [#1]  SMP
Modules linked in:
CPU: 0 UID: 0 PID: 3649 Comm: kworker/0:4 Tainted: G    B               syzkaller #0 PREEMPT 
Tainted: [B]=BAD_PAGE
Hardware name: linux,dummy-virt (DT)
Workqueue: usb_hub_wq hub_event
pstate: 004020c9 (nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : string_nocheck lib/vsprintf.c:653 [inline]
pc : string+0x58/0x138 lib/vsprintf.c:735
lr : vsnprintf+0x19c/0x594 lib/vsprintf.c:2926
sp : ffff800089373640
x29: ffff800089373640 x28: ffff8000826aa0ee x27: ffff8000893737fc
x26: 0000000000000008 x25: 00000000ffffffd0 x24: ffff800089373990
x23: 0000000000000004 x22: ffff8000893737f8 x21: ffff8000826aa0ee
x20: 0000000000000405 x19: 0000000000000005 x18: fffffffffff8e24f
x17: fff07ffffcfa3000 x16: ffff800082d38000 x15: ffff800089373720
x14: 00000000ffffffea x13: ffff8000893735c8 x12: ffff800082a2f940
x11: 0000000000000001 x10: 0000000000000001 x9 : ffff800089373990
x8 : ffff800089373990 x7 : 00000000ffffffff x6 : ffff8000893737f8
x5 : 0000000000000000 x4 : 00000000ffffffff x3 : ffffffffffff0a00
x2 : 6f7267637a79732f x1 : 0000000000000000 x0 : ffff8000893737fc
Call trace:
 string_nocheck lib/vsprintf.c:652 [inline] (P)
 string+0x58/0x138 lib/vsprintf.c:735 (P)
 vsnprintf+0x19c/0x594 lib/vsprintf.c:2926
 vprintk_store+0x100/0x464 kernel/printk/printk.c:2252
 vprintk_emit+0xac/0x2a0 kernel/printk/printk.c:2399
 vprintk_default+0x38/0x44 kernel/printk/printk.c:2438
 vprintk+0x28/0x34 kernel/printk/printk_safe.c:82
 __warn_printk+0x158/0x1c4 kernel/panic.c:946
 kobject_put+0xe0/0x114 lib/kobject.c:734
 put_device+0x14/0x24 drivers/base/core.c:3797
 hdm_disconnect+0x8c/0xa0 drivers/most/most_usb.c:1130
 usb_unbind_interface+0x78/0x2c0 drivers/usb/core/driver.c:458
 device_remove drivers/base/dd.c:571 [inline]
 device_remove+0x70/0x80 drivers/base/dd.c:563
 __device_release_driver drivers/base/dd.c:1274 [inline]
 device_release_driver_internal+0x1d4/0x230 drivers/base/dd.c:1297
 device_release_driver+0x18/0x24 drivers/base/dd.c:1320
 bus_remove_device+0xcc/0x10c drivers/base/bus.c:579
 device_del+0x14c/0x384 drivers/base/core.c:3878
 usb_disable_device+0xd8/0x1b0 drivers/usb/core/message.c:1418
 usb_disconnect+0xe0/0x300 drivers/usb/core/hub.c:2344
 hub_port_connect drivers/usb/core/hub.c:5406 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
 port_event drivers/usb/core/hub.c:5870 [inline]
 hub_event+0x91c/0x1570 drivers/usb/core/hub.c:5952
 process_one_work+0x178/0x2cc kernel/workqueue.c:3263
 process_scheduled_works kernel/workqueue.c:3346 [inline]
 worker_thread+0x250/0x358 kernel/workqueue.c:3427
 kthread+0x130/0x1fc kernel/kthread.c:463
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860
Code: 91000400 eb07003f 54000560 aa0103e5 (38656844) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	91000400 	add	x0, x0, #0x1
   4:	eb07003f 	cmp	x1, x7
   8:	54000560 	b.eq	0xb4  // b.none
   c:	aa0103e5 	mov	x5, x1
* 10:	38656844 	ldrb	w4, [x2, x5] <-- trapping instruction