================================================================== BUG: KASAN: use-after-free in __mutex_waiter_is_first kernel/locking/mutex.c:194 [inline] BUG: KASAN: use-after-free in __mutex_lock_common kernel/locking/mutex.c:682 [inline] BUG: KASAN: use-after-free in __mutex_lock+0xfb9/0x1040 kernel/locking/mutex.c:740 Read of size 8 at addr ffff888079c6c060 by task khidpd_7fff0008/4798 CPU: 0 PID: 4798 Comm: khidpd_7fff0008 Not tainted 5.16.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x41/0x5e lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x8d/0x321 mm/kasan/report.c:247 __kasan_report mm/kasan/report.c:433 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:450 __mutex_waiter_is_first kernel/locking/mutex.c:194 [inline] __mutex_lock_common kernel/locking/mutex.c:682 [inline] __mutex_lock+0xfb9/0x1040 kernel/locking/mutex.c:740 l2cap_unregister_user+0x66/0x210 net/bluetooth/l2cap_core.c:1838 hidp_session_thread+0x400/0x5d0 net/bluetooth/hidp/core.c:1305 kthread+0x344/0x400 kernel/kthread.c:327 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 4432: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:595 [inline] kzalloc include/linux/slab.h:724 [inline] hci_alloc_dev_priv+0x14/0x24f0 net/bluetooth/hci_core.c:2419 hci_alloc_dev include/net/bluetooth/hci_core.h:1259 [inline] __vhci_create_device+0xd4/0x730 drivers/bluetooth/hci_vhci.c:304 vhci_create_device drivers/bluetooth/hci_vhci.c:372 [inline] vhci_get_user drivers/bluetooth/hci_vhci.c:429 [inline] vhci_write+0x261/0x3d0 drivers/bluetooth/hci_vhci.c:509 call_write_iter include/linux/fs.h:2162 [inline] new_sync_write+0x366/0x600 fs/read_write.c:503 vfs_write+0x59c/0x810 fs/read_write.c:590 ksys_write+0xf4/0x1d0 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3c/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 4432: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xff/0x130 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:1723 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1749 slab_free mm/slub.c:3513 [inline] kfree+0xe7/0x510 mm/slub.c:4561 hci_release_dev+0x439/0x550 net/bluetooth/hci_core.c:2735 bt_host_release+0x4d/0x80 net/bluetooth/hci_sysfs.c:88 device_release+0x96/0x190 drivers/base/core.c:2230 kobject_cleanup+0xfd/0x3a0 lib/kobject.c:705 vhci_release+0x7a/0xe0 drivers/bluetooth/hci_vhci.c:567 __fput+0x1ee/0x8c0 fs/file_table.c:280 task_work_run+0xc5/0x150 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0x9c7/0x2460 kernel/exit.c:832 do_group_exit+0xe7/0x2a0 kernel/exit.c:929 get_signal+0x3e1/0x1b20 kernel/signal.c:2830 arch_do_signal_or_restart+0x2b5/0x16d0 arch/x86/kernel/signal.c:868 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0xfb/0x170 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x13/0x30 kernel/entry/common.c:300 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae Last potentially related work creation: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 __kasan_record_aux_stack+0xf5/0x120 mm/kasan/generic.c:348 insert_work+0x45/0x380 kernel/workqueue.c:1354 __queue_work+0x54c/0xc50 kernel/workqueue.c:1520 queue_work_on+0x52/0x70 kernel/workqueue.c:1547 process_one_work+0x81d/0x1200 kernel/workqueue.c:2298 worker_thread+0x4a0/0xdd0 kernel/workqueue.c:2445 kthread+0x344/0x400 kernel/kthread.c:327 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:295 Second to last potentially related work creation: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 __kasan_record_aux_stack+0xf5/0x120 mm/kasan/generic.c:348 insert_work+0x45/0x380 kernel/workqueue.c:1354 __queue_work+0x54c/0xc50 kernel/workqueue.c:1520 call_timer_fn+0x15b/0x3b0 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1461 [inline] __run_timers.part.0+0x2c5/0x7a0 kernel/time/timer.c:1734 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0x97/0x180 kernel/time/timer.c:1747 __do_softirq+0x1f1/0x641 kernel/softirq.c:558 The buggy address belongs to the object at ffff888079c6c000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 96 bytes inside of 8192-byte region [ffff888079c6c000, ffff888079c6e000) The buggy address belongs to the page: page:ffffea0001e71a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x79c68 head:ffffea0001e71a00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001f3f800 dead000000000003 ffff88800e842280 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 0x152a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 2866, ts 77716130185, free_ts 77691280461 prep_new_page mm/page_alloc.c:2418 [inline] get_page_from_freelist+0x1330/0x2e70 mm/page_alloc.c:4149 __alloc_pages+0x1b2/0x480 mm/page_alloc.c:5369 alloc_slab_page mm/slub.c:1793 [inline] allocate_slab+0x2ff/0x430 mm/slub.c:1930 new_slab mm/slub.c:1993 [inline] ___slab_alloc+0x8dd/0xbf0 mm/slub.c:3022 __slab_alloc.constprop.0+0x45/0x80 mm/slub.c:3109 slab_alloc_node mm/slub.c:3200 [inline] slab_alloc mm/slub.c:3242 [inline] __kmalloc+0x3bc/0x430 mm/slub.c:4419 kmalloc_array include/linux/slab.h:630 [inline] batadv_hash_new+0x9d/0x2a0 net/batman-adv/hash.c:56 batadv_nc_mesh_init+0x13c/0x450 net/batman-adv/network-coding.c:154 batadv_mesh_init+0x519/0x900 net/batman-adv/main.c:223 batadv_softif_init_late+0xaa3/0xd80 net/batman-adv/soft-interface.c:804 register_netdevice+0x421/0x1250 net/core/dev.c:9582 __rtnl_newlink+0xcc8/0x1370 net/core/rtnetlink.c:3457 rtnl_newlink+0x5a/0x90 net/core/rtnetlink.c:3505 rtnetlink_rcv_msg+0x39b/0x910 net/core/rtnetlink.c:5570 netlink_rcv_skb+0x11b/0x340 net/netlink/af_netlink.c:2487 netlink_unicast_kernel net/netlink/af_netlink.c:1315 [inline] netlink_unicast+0x433/0x700 net/netlink/af_netlink.c:1341 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1338 [inline] free_pcp_prepare+0x446/0x970 mm/page_alloc.c:1389 free_unref_page_prepare mm/page_alloc.c:3309 [inline] free_unref_page+0x19/0x500 mm/page_alloc.c:3388 __unfreeze_partials+0x30c/0x330 mm/slub.c:2527 qlink_free mm/kasan/quarantine.c:146 [inline] qlist_free_all+0x5a/0xc0 mm/kasan/quarantine.c:165 kasan_quarantine_reduce+0x180/0x1f0 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:259 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:3234 [inline] slab_alloc mm/slub.c:3242 [inline] __kmalloc+0x25e/0x430 mm/slub.c:4419 kmalloc include/linux/slab.h:595 [inline] load_elf_phdrs+0xd4/0x190 fs/binfmt_elf.c:480 load_elf_binary+0x186/0x3d80 fs/binfmt_elf.c:860 search_binary_handler fs/exec.c:1723 [inline] exec_binprm fs/exec.c:1764 [inline] bprm_execve fs/exec.c:1833 [inline] bprm_execve+0x639/0x13b0 fs/exec.c:1795 kernel_execve+0x2c2/0x3e0 fs/exec.c:1976 call_usermodehelper_exec_async+0x2c4/0x500 kernel/umh.c:112 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff888079c6bf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888079c6bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888079c6c000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888079c6c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888079c6c100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================