================================================================== BUG: KASAN: slab-use-after-free in __hci_acl_create_connection_sync+0x605/0x8d0 net/bluetooth/hci_sync.c:6518 Write of size 2 at addr ffff888177b64036 by task kworker/u5:0/45 CPU: 0 PID: 45 Comm: kworker/u5:0 Not tainted 6.8.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Workqueue: hci4 hci_cmd_sync_work Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xf8/0x260 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0x167/0x540 mm/kasan/report.c:488 kasan_report+0x142/0x180 mm/kasan/report.c:601 __hci_acl_create_connection_sync+0x605/0x8d0 net/bluetooth/hci_sync.c:6518 hci_cmd_sync_work+0x210/0x3a0 net/bluetooth/hci_sync.c:306 process_one_work kernel/workqueue.c:2633 [inline] process_scheduled_works+0x7e9/0xfd0 kernel/workqueue.c:2706 worker_thread+0x868/0xca0 kernel/workqueue.c:2787 kthread+0x267/0x2c0 kernel/kthread.c:388 ret_from_fork+0x32/0x60 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242 Allocated by task 4220: 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:372 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:389 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace+0x1c4/0x3a0 mm/slub.c:4012 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:711 [inline] hci_conn_add+0xbb/0x1240 net/bluetooth/hci_conn.c:914 hci_conn_add_unset net/bluetooth/hci_conn.c:1016 [inline] hci_connect_acl+0x1d3/0x490 net/bluetooth/hci_conn.c:1632 hci_connect_sco+0x36/0x390 net/bluetooth/hci_conn.c:1692 sco_connect net/bluetooth/sco.c:266 [inline] sco_sock_connect+0x1f3/0x7f0 net/bluetooth/sco.c:591 __sys_connect_file net/socket.c:2048 [inline] __sys_connect+0x317/0x390 net/socket.c:2065 __do_sys_connect net/socket.c:2075 [inline] __se_sys_connect net/socket.c:2072 [inline] __x64_sys_connect+0x75/0x90 net/socket.c:2072 do_syscall_64+0x94/0x1a0 entry_SYSCALL_64_after_hwframe+0x6f/0x77 Freed by task 45: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x4e/0x60 mm/kasan/generic.c:640 poison_slab_object+0xee/0x1a0 mm/kasan/common.c:241 __kasan_slab_free+0x34/0x70 mm/kasan/common.c:257 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kfree+0x139/0x350 mm/slub.c:4409 device_release+0x92/0x140 kobject_cleanup lib/kobject.c:682 [inline] kobject_release lib/kobject.c:716 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x14d/0x300 lib/kobject.c:733 hci_conn_cleanup net/bluetooth/hci_conn.c:176 [inline] hci_conn_del+0x73d/0xa60 net/bluetooth/hci_conn.c:1126 hci_abort_conn_sync+0x2d3/0xb30 net/bluetooth/hci_sync.c:5361 __hci_acl_create_connection_sync+0x553/0x8d0 net/bluetooth/hci_sync.c:6554 hci_cmd_sync_work+0x210/0x3a0 net/bluetooth/hci_sync.c:306 process_one_work kernel/workqueue.c:2633 [inline] process_scheduled_works+0x7e9/0xfd0 kernel/workqueue.c:2706 worker_thread+0x868/0xca0 kernel/workqueue.c:2787 kthread+0x267/0x2c0 kernel/kthread.c:388 ret_from_fork+0x32/0x60 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242 The buggy address belongs to the object at ffff888177b64000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 54 bytes inside of freed 4096-byte region [ffff888177b64000, ffff888177b65000) The buggy address belongs to the physical page: page:ffffea0005ded800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x177b60 head:ffffea0005ded800 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0x100000000000840(slab|head|node=0|zone=2) page_type: 0xffffffff() raw: 0100000000000840 ffff888100042140 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000040004 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 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1360, tgid 1360 (udevd), ts 7454913153, free_ts 6305708169 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x10f/0x130 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0x3e5f/0x4080 mm/page_alloc.c:3311 __alloc_pages+0x255/0x650 mm/page_alloc.c:4567 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page+0x5f/0x160 mm/slub.c:2190 allocate_slab mm/slub.c:2354 [inline] new_slab+0x70/0x270 mm/slub.c:2407 ___slab_alloc+0xa79/0x10b0 mm/slub.c:3540 __slab_alloc mm/slub.c:3625 [inline] __slab_alloc_node mm/slub.c:3678 [inline] slab_alloc_node mm/slub.c:3850 [inline] __do_kmalloc_node mm/slub.c:3980 [inline] __kmalloc+0x2ba/0x480 mm/slub.c:3994 kmalloc include/linux/slab.h:594 [inline] tomoyo_realpath_from_path+0xe3/0x4e0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x249/0x960 security/tomoyo/file.c:771 security_file_open+0x2a/0x80 security/security.c:2932 do_dentry_open+0x2ee/0x11c0 fs/open.c:940 do_open fs/namei.c:3641 [inline] path_openat+0x217f/0x2780 fs/namei.c:3798 do_filp_open+0x22a/0x440 fs/namei.c:3825 do_sys_openat2+0xf6/0x180 fs/open.c:1404 do_sys_open fs/open.c:1419 [inline] __do_sys_openat fs/open.c:1435 [inline] __se_sys_openat fs/open.c:1430 [inline] __x64_sys_openat+0x20d/0x260 fs/open.c:1430 do_syscall_64+0x94/0x1a0 page last free pid 1 tgid 1 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x87f/0x9a0 mm/page_alloc.c:2346 free_unref_page+0x37/0x3a0 mm/page_alloc.c:2486 free_contig_range+0x91/0x140 mm/page_alloc.c:6535 destroy_args+0x72/0x6e0 mm/debug_vm_pgtable.c:1028 debug_vm_pgtable+0x3b8/0x590 mm/debug_vm_pgtable.c:1408 do_one_initcall+0x196/0x4d0 init/main.c:1236 do_initcall_level+0x11e/0x1e0 init/main.c:1298 do_initcalls+0x3e/0x70 init/main.c:1314 kernel_init_freeable+0x364/0x4c0 init/main.c:1551 kernel_init+0x18/0x1a0 init/main.c:1441 ret_from_fork+0x32/0x60 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242 Memory state around the buggy address: ffff888177b63f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888177b63f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888177b64000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888177b64080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888177b64100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================