================================================================== BUG: KASAN: slab-use-after-free in hci_chan_del+0x3b/0x1b0 net/bluetooth/hci_conn.c:2853 Read of size 8 at addr ffff888045305b18 by task khidpd_15c22412/7139 CPU: 0 UID: 0 PID: 7139 Comm: khidpd_15c22412 Not tainted 6.14.0-rc1-next-20250207-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 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 hci_chan_del+0x3b/0x1b0 net/bluetooth/hci_conn.c:2853 l2cap_conn_free net/bluetooth/l2cap_core.c:1816 [inline] kref_put include/linux/kref.h:65 [inline] l2cap_conn_put+0x70/0xe0 net/bluetooth/l2cap_core.c:1830 session_free net/bluetooth/hidp/core.c:989 [inline] kref_put include/linux/kref.h:65 [inline] hidp_session_put+0x1e7/0x220 net/bluetooth/hidp/core.c:996 hidp_session_thread+0x458/0x490 net/bluetooth/hidp/core.c:1305 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 5839: 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] hci_chan_create+0xc8/0x310 net/bluetooth/hci_conn.c:2838 l2cap_conn_add+0x69/0x8e0 net/bluetooth/l2cap_core.c:6864 l2cap_connect_cfm+0x115/0x1090 net/bluetooth/l2cap_core.c:7247 hci_connect_cfm include/net/bluetooth/hci_core.h:2051 [inline] hci_remote_features_evt+0x68e/0xac0 net/bluetooth/hci_event.c:3726 hci_event_func net/bluetooth/hci_event.c:7473 [inline] hci_event_packet+0xac2/0x1540 net/bluetooth/hci_event.c:7525 hci_rx_work+0x3f3/0xdb0 net/bluetooth/hci_core.c:4015 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 Freed by task 7261: 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_chan_list_flush net/bluetooth/hci_conn.c:2878 [inline] hci_conn_cleanup net/bluetooth/hci_conn.c:149 [inline] hci_conn_del+0x4b5/0xc40 net/bluetooth/hci_conn.c:1164 hci_conn_failed+0x319/0x400 net/bluetooth/hci_conn.c:1267 hci_abort_conn_sync+0x56c/0x11f0 net/bluetooth/hci_sync.c:5588 hci_disconnect_all_sync+0x264/0x460 net/bluetooth/hci_sync.c:5611 hci_suspend_sync+0x41a/0xca0 net/bluetooth/hci_sync.c:6088 hci_suspend_dev+0x203/0x3e0 net/bluetooth/hci_core.c:2811 hci_suspend_notifier+0xf2/0x2b0 net/bluetooth/hci_core.c:2391 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85 notifier_call_chain_robust kernel/notifier.c:120 [inline] blocking_notifier_call_chain_robust+0xe8/0x1e0 kernel/notifier.c:345 pm_notifier_call_chain_robust+0x2c/0x60 kernel/power/main.c:102 snapshot_open+0x19b/0x280 kernel/power/user.c:77 misc_open+0x2cc/0x340 drivers/char/misc.c:179 chrdev_open+0x521/0x600 fs/char_dev.c:414 do_dentry_open+0xdec/0x1960 fs/open.c:956 vfs_open+0x3b/0x370 fs/open.c:1086 do_open fs/namei.c:3825 [inline] path_openat+0x2c9f/0x35b0 fs/namei.c:3984 do_filp_open+0x282/0x4e0 fs/namei.c:4011 do_sys_openat2+0x13f/0x1c0 fs/open.c:1428 do_sys_open fs/open.c:1443 [inline] __do_sys_openat fs/open.c:1459 [inline] __se_sys_openat fs/open.c:1454 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1454 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 The buggy address belongs to the object at ffff888045305b00 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 24 bytes inside of freed 128-byte region [ffff888045305b00, ffff888045305b80) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x45305 anon flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801ac41a00 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 6282, tgid 6282 (sed), ts 148919186849, free_ts 30576300961 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_slab_page mm/slub.c:2439 [inline] allocate_slab+0x66/0x3a0 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_node_noprof+0x2ee/0x4d0 mm/slub.c:4314 kmalloc_array_node_noprof include/linux/slab.h:1019 [inline] alloc_slab_obj_exts mm/slub.c:1965 [inline] account_slab mm/slub.c:2564 [inline] allocate_slab+0x179/0x3a0 mm/slub.c:2619 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] kmem_cache_alloc_noprof+0x268/0x380 mm/slub.c:4185 vm_area_alloc+0x24/0x1d0 kernel/fork.c:472 __install_special_mapping mm/mmap.c:1494 [inline] _install_special_mapping+0x32/0x350 mm/mmap.c:1542 map_vdso+0x34b/0x4d0 arch/x86/entry/vdso/vma.c:291 load_elf_binary+0x1cb6/0x2820 fs/binfmt_elf.c:1278 search_binary_handler fs/exec.c:1775 [inline] exec_binprm fs/exec.c:1807 [inline] bprm_execve+0x979/0x1430 fs/exec.c:1859 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+0x4be/0x550 mm/debug_vm_pgtable.c:1397 do_one_initcall+0x248/0x870 init/main.c:1257 do_initcall_level+0x157/0x210 init/main.c:1319 do_initcalls+0x3f/0x80 init/main.c:1335 kernel_init_freeable+0x435/0x5d0 init/main.c:1568 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:244 Memory state around the buggy address: ffff888045305a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888045305a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888045305b00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888045305b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888045305c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================