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Bluetooth: hci4: link tx timeout
Bluetooth: hci4: killing stalled connection 11:aa:aa:aa:aa:aa
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BUG: KASAN: slab-use-after-free in hci_disconnect+0x207/0x220 net/bluetooth/hci_conn.c:188
Read of size 8 at addr ffff8880637d8038 by task kworker/u9:3/5832

CPU: 0 UID: 0 PID: 5832 Comm: kworker/u9:3 Not tainted 6.12.0-rc6-syzkaller-00272-gda4373fbcf00 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Workqueue: hci4 hci_tx_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0xc3/0x620 mm/kasan/report.c:488
 kasan_report+0xd9/0x110 mm/kasan/report.c:601
 hci_disconnect+0x207/0x220 net/bluetooth/hci_conn.c:188
 hci_link_tx_to net/bluetooth/hci_core.c:3430 [inline]
 __check_timeout net/bluetooth/hci_core.c:3571 [inline]
 __check_timeout+0x3ed/0x720 net/bluetooth/hci_core.c:3551
 hci_sched_le net/bluetooth/hci_core.c:3688 [inline]
 hci_tx_work+0x6e3/0x1410 net/bluetooth/hci_core.c:3761
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Allocated by task 5844:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
 kmalloc_noprof include/linux/slab.h:878 [inline]
 kzalloc_noprof include/linux/slab.h:1014 [inline]
 __hci_conn_add+0x131/0x1a50 net/bluetooth/hci_conn.c:935
 hci_conn_add_unset+0x6d/0x100 net/bluetooth/hci_conn.c:1044
 le_conn_complete_evt+0x790/0x1d80 net/bluetooth/hci_event.c:5632
 hci_le_conn_complete_evt+0x23c/0x370 net/bluetooth/hci_event.c:5784
 hci_le_meta_evt+0x2e2/0x5d0 net/bluetooth/hci_event.c:7132
 hci_event_func net/bluetooth/hci_event.c:7440 [inline]
 hci_event_packet+0x666/0x1180 net/bluetooth/hci_event.c:7495
 hci_rx_work+0x2c6/0x16c0 net/bluetooth/hci_core.c:4031
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Freed by task 5151:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:2342 [inline]
 slab_free mm/slub.c:4579 [inline]
 kfree+0x14f/0x4b0 mm/slub.c:4727
 device_release+0xa1/0x240 drivers/base/core.c:2574
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1e4/0x5a0 lib/kobject.c:737
 put_device drivers/base/core.c:3780 [inline]
 device_unregister+0x2f/0xc0 drivers/base/core.c:3903
 hci_conn_del_sysfs+0xb4/0x180 net/bluetooth/hci_sysfs.c:86
 hci_conn_cleanup net/bluetooth/hci_conn.c:174 [inline]
 hci_conn_del+0x54e/0xdb0 net/bluetooth/hci_conn.c:1163
 hci_abort_conn_sync+0x75a/0xb50 net/bluetooth/hci_sync.c:5596
 abort_conn_sync+0x197/0x360 net/bluetooth/hci_conn.c:2917
 hci_cmd_sync_work+0x1a4/0x410 net/bluetooth/hci_sync.c:332
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

The buggy address belongs to the object at ffff8880637d8000
 which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 56 bytes inside of
 freed 8192-byte region [ffff8880637d8000, ffff8880637da000)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x637d8
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b042280 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000020002 00000001f5000000 0000000000000000
head: 00fff00000000040 ffff88801b042280 dead000000000122 0000000000000000
head: 0000000000000000 0000000000020002 00000001f5000000 0000000000000000
head: 00fff00000000003 ffffea00018df601 ffffffffffffffff 0000000000000000
head: 0000000000000008 0000000000000000 00000000ffffffff 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5844, tgid 5844 (kworker/u9:8), ts 53119209995, free_ts 10980497560
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1537
 prep_new_page mm/page_alloc.c:1545 [inline]
 get_page_from_freelist+0xf7d/0x2d10 mm/page_alloc.c:3457
 __alloc_pages_noprof+0x223/0x25a0 mm/page_alloc.c:4733
 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265
 alloc_slab_page mm/slub.c:2412 [inline]
 allocate_slab mm/slub.c:2578 [inline]
 new_slab+0x2c9/0x410 mm/slub.c:2631
 ___slab_alloc+0xdac/0x1880 mm/slub.c:3818
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3908
 __slab_alloc_node mm/slub.c:3961 [inline]
 slab_alloc_node mm/slub.c:4122 [inline]
 __kmalloc_cache_noprof+0x2b4/0x300 mm/slub.c:4290
 kmalloc_noprof include/linux/slab.h:878 [inline]
 kzalloc_noprof include/linux/slab.h:1014 [inline]
 __hci_conn_add+0x131/0x1a50 net/bluetooth/hci_conn.c:935
 hci_conn_add_unset+0x6d/0x100 net/bluetooth/hci_conn.c:1044
 le_conn_complete_evt+0x790/0x1d80 net/bluetooth/hci_event.c:5632
 hci_le_conn_complete_evt+0x23c/0x370 net/bluetooth/hci_event.c:5784
 hci_le_meta_evt+0x2e2/0x5d0 net/bluetooth/hci_event.c:7132
 hci_event_func net/bluetooth/hci_event.c:7440 [inline]
 hci_event_packet+0x666/0x1180 net/bluetooth/hci_event.c:7495
 hci_rx_work+0x2c6/0x16c0 net/bluetooth/hci_core.c:4031
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
page last free pid 1 tgid 1 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1108 [inline]
 free_unref_page+0x5f4/0xdc0 mm/page_alloc.c:2638
 free_contig_range+0x135/0x3f0 mm/page_alloc.c:6748
 destroy_args+0xa87/0xe60 mm/debug_vm_pgtable.c:1017
 debug_vm_pgtable+0x168e/0x31a0 mm/debug_vm_pgtable.c:1397
 do_one_initcall+0x128/0x700 init/main.c:1269
 do_initcall_level init/main.c:1331 [inline]
 do_initcalls init/main.c:1347 [inline]
 do_basic_setup init/main.c:1366 [inline]
 kernel_init_freeable+0x5c7/0x900 init/main.c:1580
 kernel_init+0x1c/0x2b0 init/main.c:1469
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Memory state around the buggy address:
 ffff8880637d7f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880637d7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880637d8000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                        ^
 ffff8880637d8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880637d8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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