usb 1-1: config 0 descriptor??
usb 1-1: string descriptor 0 read error: -71
usb 1-1: USB disconnect, device number 32
==================================================================
BUG: KASAN: slab-use-after-free in hdm_disconnect+0x5c/0xa0 drivers/most/most_usb.c:1123
Read at addr f7f00000676ddb60 by task kworker/0:2/17697
Pointer tag: [f7], memory tag: [fe]

CPU: 0 UID: 0 PID: 17697 Comm: kworker/0:2 Not tainted 6.15.0-rc7-syzkaller-00152-gd0c22de9995b #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:466 (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:408 [inline]
 print_report+0x108/0x630 mm/kasan/report.c:521
 kasan_report+0x88/0xac mm/kasan/report.c:634
 report_tag_fault arch/arm64/mm/fault.c:332 [inline]
 do_tag_recovery arch/arm64/mm/fault.c:344 [inline]
 __do_kernel_fault+0x170/0x1c8 arch/arm64/mm/fault.c:386
 do_bad_area arch/arm64/mm/fault.c:486 [inline]
 do_tag_check_fault+0x78/0x8c arch/arm64/mm/fault.c:843
 do_mem_abort+0x44/0x94 arch/arm64/mm/fault.c:919
 el1_abort+0x40/0x60 arch/arm64/kernel/entry-common.c:432
 el1h_64_sync_handler+0xa4/0x120 arch/arm64/kernel/entry-common.c:510
 el1h_64_sync+0x6c/0x70 arch/arm64/kernel/entry.S:595
 hdm_disconnect+0x5c/0xa0 drivers/most/most_usb.c:1123 (P)
 usb_unbind_interface+0x78/0x294 drivers/usb/core/driver.c:458
 device_remove drivers/base/dd.c:569 [inline]
 device_remove+0x70/0x80 drivers/base/dd.c:561
 __device_release_driver drivers/base/dd.c:1272 [inline]
 device_release_driver_internal+0x1d4/0x230 drivers/base/dd.c:1295
 device_release_driver+0x18/0x24 drivers/base/dd.c:1318
 bus_remove_device+0xcc/0x10c drivers/base/bus.c:579
 device_del+0x14c/0x384 drivers/base/core.c:3881
 usb_disable_device+0xd8/0x1b0 drivers/usb/core/message.c:1418
 usb_disconnect+0xd8/0x2bc drivers/usb/core/hub.c:2316
 hub_port_connect drivers/usb/core/hub.c:5371 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5671 [inline]
 port_event drivers/usb/core/hub.c:5831 [inline]
 hub_event+0x98c/0x1558 drivers/usb/core/hub.c:5913
 process_one_work+0x178/0x2cc kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x250/0x358 kernel/workqueue.c:3400
 kthread+0x130/0x1fc kernel/kthread.c:464
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862

Allocated by task 17697:
 kasan_save_stack+0x3c/0x64 mm/kasan/common.c:47
 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:377 [inline]
 poison_kmalloc_redzone mm/kasan/common.c:350 [inline]
 __kasan_kmalloc+0xb4/0xb8 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __kmalloc_cache_noprof+0x174/0x390 mm/slub.c:4358
 kmalloc_noprof include/linux/slab.h:905 [inline]
 kzalloc_noprof include/linux/slab.h:1039 [inline]
 hdm_probe+0x3c/0x498 drivers/most/most_usb.c:959
 usb_probe_interface+0x130/0x314 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:579 [inline]
 really_probe+0xbc/0x298 drivers/base/dd.c:657
 __driver_probe_device+0x78/0x12c drivers/base/dd.c:799
 driver_probe_device+0x3c/0x10c drivers/base/dd.c:829
 __device_attach_driver+0xb8/0xf8 drivers/base/dd.c:957
 bus_for_each_drv+0x84/0xe0 drivers/base/bus.c:462
 __device_attach+0x9c/0x188 drivers/base/dd.c:1029
 device_initial_probe+0x14/0x20 drivers/base/dd.c:1078
 bus_probe_device+0xac/0xb0 drivers/base/bus.c:537
 device_add+0x5cc/0x78c drivers/base/core.c:3692
 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:579 [inline]
 really_probe+0xbc/0x298 drivers/base/dd.c:657
 __driver_probe_device+0x78/0x12c drivers/base/dd.c:799
 driver_probe_device+0x3c/0x10c drivers/base/dd.c:829
 __device_attach_driver+0xb8/0xf8 drivers/base/dd.c:957
 bus_for_each_drv+0x84/0xe0 drivers/base/bus.c:462
 __device_attach+0x9c/0x188 drivers/base/dd.c:1029
 device_initial_probe+0x14/0x20 drivers/base/dd.c:1078
 bus_probe_device+0xac/0xb0 drivers/base/bus.c:537
 device_add+0x5cc/0x78c drivers/base/core.c:3692
 usb_new_device+0x27c/0x650 drivers/usb/core/hub.c:2663
 hub_port_connect drivers/usb/core/hub.c:5531 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5671 [inline]
 port_event drivers/usb/core/hub.c:5831 [inline]
 hub_event+0xe20/0x1558 drivers/usb/core/hub.c:5913
 process_one_work+0x178/0x2cc kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x250/0x358 kernel/workqueue.c:3400
 kthread+0x130/0x1fc kernel/kthread.c:464
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862

Freed by task 17697:
 kasan_save_stack+0x3c/0x64 mm/kasan/common.c:47
 save_stack_info+0x40/0x158 mm/kasan/tags.c:106
 kasan_save_free_info+0x18/0x24 mm/kasan/tags.c:147
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x74/0x8c mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2380 [inline]
 slab_free mm/slub.c:4642 [inline]
 kfree+0xfc/0x30c mm/slub.c:4841
 release_mdev+0x10/0x1c drivers/most/most_usb.c:932
 device_release+0x34/0x90 drivers/base/core.c:2568
 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:3800 [inline]
 device_unregister+0x24/0x34 drivers/base/core.c:3923
 most_deregister_interface+0xf4/0x104 drivers/most/core.c:1402
 hdm_disconnect+0x5c/0xa0 drivers/most/most_usb.c:1123
 usb_unbind_interface+0x78/0x294 drivers/usb/core/driver.c:458
 device_remove drivers/base/dd.c:569 [inline]
 device_remove+0x70/0x80 drivers/base/dd.c:561
 __device_release_driver drivers/base/dd.c:1272 [inline]
 device_release_driver_internal+0x1d4/0x230 drivers/base/dd.c:1295
 device_release_driver+0x18/0x24 drivers/base/dd.c:1318
 bus_remove_device+0xcc/0x10c drivers/base/bus.c:579
 device_del+0x14c/0x384 drivers/base/core.c:3881
 usb_disable_device+0xd8/0x1b0 drivers/usb/core/message.c:1418
 usb_disconnect+0xd8/0x2bc drivers/usb/core/hub.c:2316
 hub_port_connect drivers/usb/core/hub.c:5371 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5671 [inline]
 port_event drivers/usb/core/hub.c:5831 [inline]
 hub_event+0x98c/0x1558 drivers/usb/core/hub.c:5913
 process_one_work+0x178/0x2cc kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x250/0x358 kernel/workqueue.c:3400
 kthread+0x130/0x1fc kernel/kthread.c:464
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862

The buggy address belongs to the object at fff00000676dd000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 2912 bytes inside of
 4096-byte region [fff00000676dd000, fff00000676de000)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xf1f00000676d9000 pfn:0xa76d8
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 f0f0000003001c00 ffffc1ffc0162400 0000000000000002
raw: f1f00000676d9000 0000000080080005 00000000f5000000 0000000000000000
head: 01ffc00000000040 f0f0000003001c00 ffffc1ffc0162400 0000000000000002
head: f1f00000676d9000 0000000080080005 00000000f5000000 0000000000000000
head: 01ffc00000000003 ffffc1ffc19db601 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 fff00000676dd900: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
 fff00000676dda00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
>fff00000676ddb00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
                                     ^
 fff00000676ddc00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
 fff00000676ddd00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
==================================================================
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 0 PID: 17697 at lib/refcount.c:28 refcount_warn_saturate+0xf4/0x144 lib/refcount.c:28
Modules linked in:
CPU: 0 UID: 0 PID: 17697 Comm: kworker/0:2 Tainted: G    B               6.15.0-rc7-syzkaller-00152-gd0c22de9995b #0 PREEMPT 
Tainted: [B]=BAD_PAGE
Hardware name: linux,dummy-virt (DT)
Workqueue: usb_hub_wq hub_event
pstate: 61402009 (nZCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)
pc : refcount_warn_saturate+0xf4/0x144 lib/refcount.c:28
lr : refcount_warn_saturate+0xf4/0x144 lib/refcount.c:28
sp : ffff800083a3b970
x29: ffff800083a3b970 x28: 0000000000000000 x27: f4f0000004e49c00
x26: f7f0000034619800 x25: fbf0000006f48800 x24: fbf0000006f488b0
x23: ffff800082b0ca38 x22: 0000000000000000 x21: f7f00000676ddb68
x20: f7f0000034619850 x19: f6f000003461b800 x18: 00000000ffffffff
x17: 0000000000000000 x16: 0000000000000000 x15: ffff80008307b9f0
x14: 0000000000000141 x13: ffff8000828d1138 x12: 0000000000000001
x11: 0000094f9b8189d7 x10: cd40122cb6fda448 x9 : 49175aafc60d7cd9
x8 : f9f000003512ed28 x7 : fff000007f8d4b00 x6 : fff07ffffd022000
x5 : ffff8000828d4480 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000000 x1 : 0000000000000000 x0 : f9f000003512db40
Call trace:
 refcount_warn_saturate+0xf4/0x144 lib/refcount.c:28 (P)
 __refcount_sub_and_test include/linux/refcount.h:400 [inline]
 __refcount_dec_and_test include/linux/refcount.h:432 [inline]
 refcount_dec_and_test include/linux/refcount.h:450 [inline]
 kref_put include/linux/kref.h:64 [inline]
 kobject_put+0x110/0x114 lib/kobject.c:737
 put_device+0x14/0x24 drivers/base/core.c:3800
 hdm_disconnect+0x84/0xa0 drivers/most/most_usb.c:1129
 usb_unbind_interface+0x78/0x294 drivers/usb/core/driver.c:458
 device_remove drivers/base/dd.c:569 [inline]
 device_remove+0x70/0x80 drivers/base/dd.c:561
 __device_release_driver drivers/base/dd.c:1272 [inline]
 device_release_driver_internal+0x1d4/0x230 drivers/base/dd.c:1295
 device_release_driver+0x18/0x24 drivers/base/dd.c:1318
 bus_remove_device+0xcc/0x10c drivers/base/bus.c:579
 device_del+0x14c/0x384 drivers/base/core.c:3881
 usb_disable_device+0xd8/0x1b0 drivers/usb/core/message.c:1418
 usb_disconnect+0xd8/0x2bc drivers/usb/core/hub.c:2316
 hub_port_connect drivers/usb/core/hub.c:5371 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5671 [inline]
 port_event drivers/usb/core/hub.c:5831 [inline]
 hub_event+0x98c/0x1558 drivers/usb/core/hub.c:5913
 process_one_work+0x178/0x2cc kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x250/0x358 kernel/workqueue.c:3400
 kthread+0x130/0x1fc kernel/kthread.c:464
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862
---[ end trace 0000000000000000 ]---