================================================================== BUG: KASAN: slab-use-after-free in __mutex_waiter_is_first kernel/locking/mutex.c:172 [inline] BUG: KASAN: slab-use-after-free in __mutex_lock_common kernel/locking/mutex.c:664 [inline] BUG: KASAN: slab-use-after-free in __mutex_lock+0x830/0x1010 kernel/locking/mutex.c:730 Read of size 8 at addr ffff88803348d320 by task kworker/1:6/5956 CPU: 1 UID: 0 PID: 5956 Comm: kworker/1:6 Not tainted 6.14.0-rc2-next-20250212-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Workqueue: events l2cap_chan_timeout 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:378 [inline] print_report+0x169/0x550 mm/kasan/report.c:489 kasan_report+0x143/0x180 mm/kasan/report.c:602 __mutex_waiter_is_first kernel/locking/mutex.c:172 [inline] __mutex_lock_common kernel/locking/mutex.c:664 [inline] __mutex_lock+0x830/0x1010 kernel/locking/mutex.c:730 l2cap_chan_timeout+0x63/0x360 net/bluetooth/l2cap_core.c:417 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317 worker_thread+0x870/0xd30 kernel/workqueue.c:3398 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:244 Allocated by task 8788: 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:902 [inline] kzalloc_noprof include/linux/slab.h:1038 [inline] l2cap_conn_add+0xa9/0x8e0 net/bluetooth/l2cap_core.c:6820 l2cap_chan_connect+0x623/0xeb0 net/bluetooth/l2cap_core.c:7011 bt_6lowpan_connect net/bluetooth/6lowpan.c:894 [inline] lowpan_control_write+0x572/0x870 net/bluetooth/6lowpan.c:1129 full_proxy_write+0x17b/0x250 fs/debugfs/file.c:398 vfs_write+0x29f/0xd10 fs/read_write.c:677 ksys_write+0x18f/0x2b0 fs/read_write.c:731 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 8609: 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 hci_disconn_cfm include/net/bluetooth/hci_core.h:2069 [inline] hci_conn_hash_flush+0x1be/0x350 net/bluetooth/hci_conn.c:2698 hci_dev_close_sync+0xa42/0x11c0 net/bluetooth/hci_sync.c:5197 hci_dev_do_close net/bluetooth/hci_core.c:482 [inline] hci_unregister_dev+0x20b/0x510 net/bluetooth/hci_core.c:2677 vhci_release+0x80/0xd0 drivers/bluetooth/hci_vhci.c:664 __fput+0x3e9/0x9f0 fs/file_table.c:464 task_work_run+0x24f/0x310 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xa2a/0x2860 kernel/exit.c:952 do_group_exit+0x207/0x2c0 kernel/exit.c:1101 get_signal+0x16b2/0x1750 kernel/signal.c:3036 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88803348d000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 800 bytes inside of freed 1024-byte region [ffff88803348d000, ffff88803348d400) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88803348f000 pfn:0x33488 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff88801ac41dc0 ffffea0000cf9e10 ffffea0000d3a610 raw: ffff88803348f000 000000000010000f 00000000f5000000 0000000000000000 head: 00fff00000000240 ffff88801ac41dc0 ffffea0000cf9e10 ffffea0000d3a610 head: ffff88803348f000 000000000010000f 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea0000cd2201 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 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 12, tgid 12 (kworker/u8:1), ts 94645466360, free_ts 93628450453 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:2369 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] __do_kmalloc_node mm/slub.c:4307 [inline] __kmalloc_noprof+0x2e6/0x4c0 mm/slub.c:4320 kmalloc_noprof include/linux/slab.h:906 [inline] kzalloc_noprof include/linux/slab.h:1038 [inline] ieee802_11_parse_elems_full+0xd9/0x2750 net/mac80211/parse.c:985 ieee802_11_parse_elems_crc net/mac80211/ieee80211_i.h:2400 [inline] ieee802_11_parse_elems net/mac80211/ieee80211_i.h:2407 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1577 [inline] ieee80211_ibss_rx_queued_mgmt+0x4c8/0x2d70 net/mac80211/ibss.c:1608 ieee80211_iface_process_skb net/mac80211/iface.c:1618 [inline] ieee80211_iface_work+0x933/0x1100 net/mac80211/iface.c:1672 cfg80211_wiphy_work+0x2f0/0x490 net/wireless/core.c:435 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317 worker_thread+0x870/0xd30 kernel/workqueue.c:3398 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 page last free pid 5965 tgid 5964 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 __slab_free+0x2c2/0x380 mm/slub.c:4534 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4129 [inline] slab_alloc_node mm/slub.c:4178 [inline] kmem_cache_alloc_noprof+0x1d9/0x380 mm/slub.c:4185 ptlock_alloc+0x20/0x70 mm/memory.c:7102 ptlock_init include/linux/mm.h:2941 [inline] pagetable_pte_ctor include/linux/mm.h:2989 [inline] __pte_alloc_one_noprof include/asm-generic/pgalloc.h:73 [inline] pte_alloc_one+0x73/0x160 arch/x86/mm/pgtable.c:44 do_fault_around mm/memory.c:5402 [inline] do_read_fault mm/memory.c:5441 [inline] do_fault mm/memory.c:5584 [inline] do_pte_missing mm/memory.c:4103 [inline] handle_pte_fault mm/memory.c:5947 [inline] __handle_mm_fault+0x3ac2/0x70f0 mm/memory.c:6090 handle_mm_fault+0x3e5/0x8d0 mm/memory.c:6259 faultin_page mm/gup.c:1193 [inline] __get_user_pages+0x1a92/0x4140 mm/gup.c:1488 populate_vma_page_range+0x264/0x330 mm/gup.c:1926 __mm_populate+0x27a/0x460 mm/gup.c:2029 mm_populate include/linux/mm.h:3355 [inline] vm_mmap_pgoff+0x303/0x430 mm/util.c:581 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88803348d200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88803348d280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88803348d300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88803348d380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88803348d400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================