syzbot

usb 1-1: USB disconnect, device number 3
==================================================================
BUG: KASAN: use-after-free in hdm_disconnect+0x109/0x1c0 drivers/most/most_usb.c:1125
Read of size 8 at addr ffff88807f2e9898 by task kworker/0:3/3648

CPU: 0 PID: 3648 Comm: kworker/0:3 Not tainted 6.1.106-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Workqueue: usb_hub_wq hub_event
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x15f/0x4f0 mm/kasan/report.c:395
 kasan_report+0x136/0x160 mm/kasan/report.c:495
 hdm_disconnect+0x109/0x1c0 drivers/most/most_usb.c:1125
 usb_unbind_interface+0x1cd/0x840 drivers/usb/core/driver.c:458
 device_remove drivers/base/dd.c:550 [inline]
 __device_release_driver drivers/base/dd.c:1260 [inline]
 device_release_driver_internal+0x59e/0x880 drivers/base/dd.c:1286
 bus_remove_device+0x2e5/0x400 drivers/base/bus.c:529
 device_del+0x6e2/0xbd0 drivers/base/core.c:3880
 usb_disable_device+0x3b8/0x840 drivers/usb/core/message.c:1414
 usb_disconnect+0x33c/0x8c0 drivers/usb/core/hub.c:2275
 hub_port_connect drivers/usb/core/hub.c:5321 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5617 [inline]
 port_event drivers/usb/core/hub.c:5773 [inline]
 hub_event+0x1f78/0x5730 drivers/usb/core/hub.c:5855
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>

Allocated by task 3683:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:383
 kmalloc include/linux/slab.h:556 [inline]
 kzalloc include/linux/slab.h:692 [inline]
 hdm_probe+0x91/0x13d0 drivers/most/most_usb.c:959
 usb_probe_interface+0x5c0/0xaf0 drivers/usb/core/driver.c:396
 really_probe+0x2ab/0xcb0 drivers/base/dd.c:639
 __driver_probe_device+0x1a2/0x3d0 drivers/base/dd.c:785
 driver_probe_device+0x50/0x420 drivers/base/dd.c:815
 __device_attach_driver+0x2cf/0x510 drivers/base/dd.c:943
 bus_for_each_drv+0x183/0x200 drivers/base/bus.c:427
 __device_attach+0x359/0x570 drivers/base/dd.c:1015
 bus_probe_device+0xba/0x1e0 drivers/base/bus.c:487
 device_add+0xb48/0xfd0 drivers/base/core.c:3692
 usb_set_configuration+0x19dd/0x2020 drivers/usb/core/message.c:2165
 usb_generic_driver_probe+0x84/0x140 drivers/usb/core/generic.c:238
 usb_probe_device+0x130/0x260 drivers/usb/core/driver.c:293
 really_probe+0x2ab/0xcb0 drivers/base/dd.c:639
 __driver_probe_device+0x1a2/0x3d0 drivers/base/dd.c:785
 driver_probe_device+0x50/0x420 drivers/base/dd.c:815
 __device_attach_driver+0x2cf/0x510 drivers/base/dd.c:943
 bus_for_each_drv+0x183/0x200 drivers/base/bus.c:427
 __device_attach+0x359/0x570 drivers/base/dd.c:1015
 bus_probe_device+0xba/0x1e0 drivers/base/bus.c:487
 device_add+0xb48/0xfd0 drivers/base/core.c:3692
 usb_new_device+0xbdd/0x18f0 drivers/usb/core/hub.c:2620
 hub_port_connect drivers/usb/core/hub.c:5477 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5617 [inline]
 port_event drivers/usb/core/hub.c:5773 [inline]
 hub_event+0x2efe/0x5730 drivers/usb/core/hub.c:5855
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Freed by task 3648:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516
 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1724 [inline]
 slab_free_freelist_hook mm/slub.c:1750 [inline]
 slab_free mm/slub.c:3661 [inline]
 __kmem_cache_free+0x25c/0x3c0 mm/slub.c:3674
 device_release+0x91/0x1c0
 kobject_cleanup lib/kobject.c:681 [inline]
 kobject_release lib/kobject.c:712 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x224/0x460 lib/kobject.c:729
 hdm_disconnect+0xef/0x1c0 drivers/most/most_usb.c:1123
 usb_unbind_interface+0x1cd/0x840 drivers/usb/core/driver.c:458
 device_remove drivers/base/dd.c:550 [inline]
 __device_release_driver drivers/base/dd.c:1260 [inline]
 device_release_driver_internal+0x59e/0x880 drivers/base/dd.c:1286
 bus_remove_device+0x2e5/0x400 drivers/base/bus.c:529
 device_del+0x6e2/0xbd0 drivers/base/core.c:3880
 usb_disable_device+0x3b8/0x840 drivers/usb/core/message.c:1414
 usb_disconnect+0x33c/0x8c0 drivers/usb/core/hub.c:2275
 hub_port_connect drivers/usb/core/hub.c:5321 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5617 [inline]
 port_event drivers/usb/core/hub.c:5773 [inline]
 hub_event+0x1f78/0x5730 drivers/usb/core/hub.c:5855
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

The buggy address belongs to the object at ffff88807f2e8000
 which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 6296 bytes inside of
 8192-byte region [ffff88807f2e8000, ffff88807f2ea000)

The buggy address belongs to the physical page:
page:ffffea0001fcba00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7f2e8
head:ffffea0001fcba00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888012842280
raw: 0000000000000000 0000000080020002 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 3305, tgid 3305 (dhcpcd), ts 111567102688, free_ts 111369394882
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2517
 prep_new_page mm/page_alloc.c:2524 [inline]
 get_page_from_freelist+0x322e/0x33b0 mm/page_alloc.c:4290
 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5558
 alloc_slab_page+0x6a/0x150 mm/slub.c:1794
 allocate_slab mm/slub.c:1939 [inline]
 new_slab+0x84/0x2d0 mm/slub.c:1992
 ___slab_alloc+0xc20/0x1270 mm/slub.c:3180
 __slab_alloc mm/slub.c:3279 [inline]
 slab_alloc_node mm/slub.c:3364 [inline]
 __kmem_cache_alloc_node+0x19f/0x260 mm/slub.c:3437
 __do_kmalloc_node mm/slab_common.c:954 [inline]
 __kmalloc_node_track_caller+0xa0/0x220 mm/slab_common.c:975
 kmalloc_reserve net/core/skbuff.c:446 [inline]
 __alloc_skb+0x135/0x670 net/core/skbuff.c:515
 alloc_skb include/linux/skbuff.h:1271 [inline]
 netlink_dump+0x1ed/0xc50 net/netlink/af_netlink.c:2198
 netlink_recvmsg+0x6c8/0x1180 net/netlink/af_netlink.c:1956
 ____sys_recvmsg+0x285/0x530
 ___sys_recvmsg net/socket.c:2775 [inline]
 __sys_recvmsg+0x2e9/0x3d0 net/socket.c:2805
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1444 [inline]
 free_pcp_prepare mm/page_alloc.c:1494 [inline]
 free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3369
 free_unref_page+0x33/0x3e0 mm/page_alloc.c:3464
 free_slab mm/slub.c:2031 [inline]
 discard_slab mm/slub.c:2037 [inline]
 __unfreeze_partials+0x1b7/0x210 mm/slub.c:2586
 put_cpu_partial+0x17b/0x250 mm/slub.c:2662
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x156/0x170 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:305
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737
 slab_alloc_node mm/slub.c:3398 [inline]
 __kmem_cache_alloc_node+0x137/0x260 mm/slub.c:3437
 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1045
 kmalloc include/linux/slab.h:556 [inline]
 kzalloc include/linux/slab.h:692 [inline]
 nsim_fib_create+0xa4/0xba0 drivers/net/netdevsim/fib.c:1558
 nsim_dev_reload_create drivers/net/netdevsim/dev.c:1485 [inline]
 nsim_dev_reload_up+0x3cd/0x8e0 drivers/net/netdevsim/dev.c:985
 devlink_reload+0x2a0/0x6a0 net/devlink/leftover.c:4499
 devlink_pernet_pre_exit+0x14e/0x2c0 net/devlink/leftover.c:12521
 ops_pre_exit_list net/core/net_namespace.c:162 [inline]
 cleanup_net+0x59c/0xb60 net/core/net_namespace.c:592
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292

Memory state around the buggy address:
 ffff88807f2e9780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807f2e9800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807f2e9880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff88807f2e9900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807f2e9980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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