Bluetooth: hci4: link tx timeout Bluetooth: hci4: killing stalled connection 11:aa:aa:aa:aa:aa ================================================================== BUG: KASAN: slab-use-after-free in hci_disconnect+0x208/0x2d0 net/bluetooth/hci_conn.c:188 Read of size 1 at addr ffff88805e86403d by task kworker/u9:4/5838 CPU: 1 UID: 0 PID: 5838 Comm: kworker/u9:4 Not tainted 6.14.0-rc3-next-20250218-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Workqueue: hci4 hci_tx_work Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:410 [inline] print_report+0x16b/0x5a0 mm/kasan/report.c:510 kasan_report+0x143/0x180 mm/kasan/report.c:623 hci_disconnect+0x208/0x2d0 net/bluetooth/hci_conn.c:188 hci_link_tx_to net/bluetooth/hci_core.c:3406 [inline] __check_timeout+0x3a5/0x550 net/bluetooth/hci_core.c:3547 hci_sched_le net/bluetooth/hci_core.c:3664 [inline] hci_tx_work+0xb68/0x1590 net/bluetooth/hci_core.c:3737 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xabe/0x18e0 kernel/workqueue.c:3319 worker_thread+0x870/0xd30 kernel/workqueue.c:3400 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 5833: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x243/0x390 mm/slub.c:4339 kmalloc_noprof include/linux/slab.h:911 [inline] kzalloc_noprof include/linux/slab.h:1047 [inline] __hci_conn_add+0x2f9/0x1890 net/bluetooth/hci_conn.c:935 le_conn_complete_evt+0x303/0x1360 net/bluetooth/hci_event.c:5637 hci_le_conn_complete_evt+0x18c/0x420 net/bluetooth/hci_event.c:5789 hci_event_func net/bluetooth/hci_event.c:7470 [inline] hci_event_packet+0xa54/0x1540 net/bluetooth/hci_event.c:7525 hci_rx_work+0x3f3/0xdb0 net/bluetooth/hci_core.c:4015 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xabe/0x18e0 kernel/workqueue.c:3319 worker_thread+0x870/0xd30 kernel/workqueue.c:3400 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Freed by task 5833: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2367 [inline] slab_free mm/slub.c:4623 [inline] kfree+0x196/0x430 mm/slub.c:4816 device_release+0x99/0x1c0 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x22f/0x480 lib/kobject.c:737 hci_conn_cleanup net/bluetooth/hci_conn.c:174 [inline] hci_conn_del+0x8c4/0xc40 net/bluetooth/hci_conn.c:1164 hci_conn_failed+0x319/0x400 net/bluetooth/hci_conn.c:1267 hci_abort_conn_sync+0xd27/0x1340 net/bluetooth/hci_sync.c:5588 hci_cmd_sync_work+0x22b/0x400 net/bluetooth/hci_sync.c:332 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xabe/0x18e0 kernel/workqueue.c:3319 worker_thread+0x870/0xd30 kernel/workqueue.c:3400 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the object at ffff88805e864000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 61 bytes inside of freed 8192-byte region [ffff88805e864000, ffff88805e866000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5e860 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 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801b042280 dead000000000122 0000000000000000 head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea00017a1801 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 5833, tgid 5833 (kworker/u9:3), ts 88499088033, free_ts 28416264925 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1629 prep_new_page mm/page_alloc.c:1637 [inline] get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3555 __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4817 alloc_pages_mpol+0x311/0x660 mm/mempolicy.c:2301 alloc_slab_page mm/slub.c:2437 [inline] allocate_slab+0x8f/0x3a0 mm/slub.c:2601 new_slab mm/slub.c:2654 [inline] ___slab_alloc+0xc27/0x14a0 mm/slub.c:3840 __slab_alloc+0x58/0xa0 mm/slub.c:3930 __slab_alloc_node mm/slub.c:4005 [inline] slab_alloc_node mm/slub.c:4166 [inline] __kmalloc_cache_noprof+0x27b/0x390 mm/slub.c:4334 kmalloc_noprof include/linux/slab.h:911 [inline] kzalloc_noprof include/linux/slab.h:1047 [inline] __hci_conn_add+0x2f9/0x1890 net/bluetooth/hci_conn.c:935 hci_conn_request_evt+0x642/0xf00 net/bluetooth/hci_event.c:3286 hci_event_func net/bluetooth/hci_event.c:7473 [inline] hci_event_packet+0xac1/0x1540 net/bluetooth/hci_event.c:7525 hci_rx_work+0x3f3/0xdb0 net/bluetooth/hci_core.c:4015 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xabe/0x18e0 kernel/workqueue.c:3319 worker_thread+0x870/0xd30 kernel/workqueue.c:3400 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 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:1205 [inline] free_frozen_pages+0xe0d/0x10e0 mm/page_alloc.c:2738 free_contig_range+0x14c/0x430 mm/page_alloc.c:6755 destroy_args+0x94/0x4b0 mm/debug_vm_pgtable.c:1017 debug_vm_pgtable+0x551/0x590 mm/debug_vm_pgtable.c:1397 do_one_initcall+0x248/0x930 init/main.c:1257 do_initcall_level+0x157/0x210 init/main.c:1319 do_initcalls+0x71/0xd0 init/main.c:1335 kernel_init_freeable+0x430/0x5d0 init/main.c:1567 kernel_init+0x1d/0x2b0 init/main.c:1457 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff88805e863f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805e863f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88805e864000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805e864080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805e864100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================