================================================================== BUG: KASAN: use-after-free in __mutex_lock_common kernel/locking/mutex.c:582 [inline] BUG: KASAN: use-after-free in __mutex_lock+0xe7/0xaf0 kernel/locking/mutex.c:747 Read of size 8 at addr ffff8880733d4070 by task khidpd_15c25886/15807 CPU: 0 PID: 15807 Comm: khidpd_15c25886 Not tainted 6.1.138-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Call Trace: dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x220 mm/kasan/report.c:427 kasan_report+0x10b/0x140 mm/kasan/report.c:531 __mutex_lock_common kernel/locking/mutex.c:582 [inline] __mutex_lock+0xe7/0xaf0 kernel/locking/mutex.c:747 l2cap_unregister_user+0x66/0x1a0 net/bluetooth/l2cap_core.c:1893 hidp_session_thread+0x3c4/0x400 net/bluetooth/hidp/core.c:1305 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 15364: 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+0x8e/0xa0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc+0xb0/0x240 mm/slab_common.c:949 kmalloc include/linux/slab.h:568 [inline] kzalloc include/linux/slab.h:699 [inline] hci_alloc_dev_priv+0x23/0x1d20 net/bluetooth/hci_core.c:2436 hci_alloc_dev include/net/bluetooth/hci_core.h:1469 [inline] __vhci_create_device drivers/bluetooth/hci_vhci.c:308 [inline] vhci_create_device+0x13b/0x740 drivers/bluetooth/hci_vhci.c:379 vhci_get_user drivers/bluetooth/hci_vhci.c:436 [inline] vhci_write+0x39a/0x460 drivers/bluetooth/hci_vhci.c:516 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x44c/0x960 fs/read_write.c:584 ksys_write+0x143/0x240 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Freed by task 15364: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x2d/0x50 mm/kasan/generic.c:516 ____kasan_slab_free+0x126/0x1e0 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+0x131/0x1a0 mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0xb6/0x1f0 mm/slub.c:3674 hci_release_dev+0x13c4/0x1530 net/bluetooth/hci_core.c:2766 bt_host_release+0x7e/0x90 net/bluetooth/hci_sysfs.c:85 device_release+0x92/0x1c0 drivers/base/core.c:-1 kobject_cleanup lib/kobject.c:681 [inline] kobject_release lib/kobject.c:712 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x21d/0x460 lib/kobject.c:729 vhci_release+0x87/0xd0 drivers/bluetooth/hci_vhci.c:574 __fput+0x22c/0x920 fs/file_table.c:320 task_work_run+0x1ca/0x250 kernel/task_work.c:203 exit_task_work include/linux/task_work.h:39 [inline] do_exit+0x936/0x2400 kernel/exit.c:871 do_group_exit+0x217/0x2d0 kernel/exit.c:1021 get_signal+0x1272/0x1350 kernel/signal.c:2871 arch_do_signal_or_restart+0xb0/0x1230 arch/x86/kernel/signal.c:871 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486 insert_work+0x54/0x3c0 kernel/workqueue.c:1361 __queue_work+0xba3/0xfb0 kernel/workqueue.c:1520 queue_work_on+0x11d/0x1d0 kernel/workqueue.c:1548 process_one_work+0x898/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Second to last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486 insert_work+0x54/0x3c0 kernel/workqueue.c:1361 __queue_work+0xba3/0xfb0 kernel/workqueue.c:1520 call_timer_fn+0x1a0/0x670 kernel/time/timer.c:1504 expire_timers kernel/time/timer.c:1544 [inline] __run_timers+0x550/0x7c0 kernel/time/timer.c:1820 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833 handle_softirqs+0x2a1/0x920 kernel/softirq.c:578 run_ksoftirqd+0x98/0xf0 kernel/softirq.c:945 smpboot_thread_fn+0x64a/0xa40 kernel/smpboot.c:164 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff8880733d4000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 112 bytes inside of 8192-byte region [ffff8880733d4000, ffff8880733d6000) The buggy address belongs to the physical page: page:ffffea0001ccf400 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880733d0000 pfn:0x733d0 head:ffffea0001ccf400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888017440ac8 ffffea0001599208 ffff888017442280 raw: ffff8880733d0000 0000000000020001 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 14722, tgid 14719 (syz.1.2428), ts 1328861148970, free_ts 1328786692217 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2532 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x1a26/0x1ac0 mm/page_alloc.c:4328 __alloc_pages+0x1df/0x4e0 mm/page_alloc.c:5606 alloc_slab_page+0x5d/0x160 mm/slub.c:1794 allocate_slab mm/slub.c:1939 [inline] new_slab+0x87/0x2c0 mm/slub.c:1992 ___slab_alloc+0xbc6/0x1220 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x1a0/0x260 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc+0xa0/0x240 mm/slab_common.c:949 kmalloc_array include/linux/slab.h:615 [inline] mb_cache_create+0x15b/0x530 fs/mbcache.c:370 __ext4_fill_super fs/ext4/super.c:5330 [inline] ext4_fill_super+0x5aba/0x80d0 fs/ext4/super.c:5654 get_tree_bdev+0x3f1/0x610 fs/super.c:1366 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x24a/0xa40 fs/namespace.c:3057 do_mount fs/namespace.c:3400 [inline] __do_sys_mount fs/namespace.c:3608 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3585 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 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:1459 [inline] free_pcp_prepare mm/page_alloc.c:1509 [inline] free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3384 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3479 __skb_frag_unref include/linux/skbuff.h:3436 [inline] skb_release_data+0x499/0x7c0 net/core/skbuff.c:785 skb_release_all net/core/skbuff.c:856 [inline] __kfree_skb+0x4c/0x60 net/core/skbuff.c:870 tcp_clean_rtx_queue net/ipv4/tcp_input.c:3400 [inline] tcp_ack+0x2229/0x6490 net/ipv4/tcp_input.c:3959 tcp_rcv_established+0xeba/0x1cf0 net/ipv4/tcp_input.c:6006 tcp_v4_do_rcv+0x48d/0xb00 net/ipv4/tcp_ipv4.c:1683 tcp_v4_rcv+0x2789/0x2e30 net/ipv4/tcp_ipv4.c:2114 ip_protocol_deliver_rcu+0x3ad/0x780 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x2c7/0x510 net/ipv4/ip_input.c:233 NF_HOOK+0x2ff/0x390 include/linux/netfilter.h:302 dst_input include/net/dst.h:463 [inline] ip_sublist_rcv_finish net/ipv4/ip_input.c:580 [inline] ip_list_rcv_finish net/ipv4/ip_input.c:631 [inline] ip_sublist_rcv+0xa30/0xd10 net/ipv4/ip_input.c:639 ip_list_rcv+0x3df/0x430 net/ipv4/ip_input.c:674 __netif_receive_skb_list_ptype net/core/dev.c:5612 [inline] __netif_receive_skb_list_core+0x574/0x740 net/core/dev.c:5660 __netif_receive_skb_list net/core/dev.c:5712 [inline] netif_receive_skb_list_internal+0x90f/0xc50 net/core/dev.c:5803 gro_normal_list include/net/gro.h:433 [inline] napi_complete_done+0x37d/0x830 net/core/dev.c:6144 Memory state around the buggy address: ffff8880733d3f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880733d3f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880733d4000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880733d4080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880733d4100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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