================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:96 [inline] BUG: KASAN: slab-use-after-free in atomic_dec_and_test include/linux/atomic/atomic-instrumented.h:1375 [inline] BUG: KASAN: slab-use-after-free in hci_conn_drop include/net/bluetooth/hci_core.h:1574 [inline] BUG: KASAN: slab-use-after-free in __sco_sock_close+0x2bc/0x690 net/bluetooth/sco.c:444 Write of size 4 at addr ffff88806cb32010 by task syz-executor.2/7605 CPU: 0 PID: 7605 Comm: syz-executor.2 Not tainted 6.7.0-syzkaller-12286-g5ca1a5153a28 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc4/0x620 mm/kasan/report.c:488 kasan_report+0xda/0x110 mm/kasan/report.c:601 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0xef/0x190 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_dec_and_test include/linux/atomic/atomic-instrumented.h:1375 [inline] hci_conn_drop include/net/bluetooth/hci_core.h:1574 [inline] __sco_sock_close+0x2bc/0x690 net/bluetooth/sco.c:444 sco_sock_close net/bluetooth/sco.c:469 [inline] sco_sock_release+0x6f/0x2c0 net/bluetooth/sco.c:1246 __sock_release+0xae/0x260 net/socket.c:659 sock_close+0x1c/0x20 net/socket.c:1421 __fput+0x270/0xb70 fs/file_table.c:376 __fput_sync+0x47/0x50 fs/file_table.c:461 __do_sys_close fs/open.c:1554 [inline] __se_sys_close fs/open.c:1539 [inline] __x64_sys_close+0x87/0xf0 fs/open.c:1539 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7fe14227bc9a Code: 48 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c 24 0c e8 03 7f 02 00 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 36 89 d7 89 44 24 0c e8 63 7f 02 00 8b 44 24 RSP: 002b:00007ffd5aacfc30 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00007fe14227bc9a RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 00007fe1423ad980 R08: 0000001b33120000 R09: 0000000000000001 R10: 000000008a9048d5 R11: 0000000000000293 R12: 000000000005513d R13: ffffffffffffffff R14: 00007fe141e00000 R15: 0000000000054dfc Allocated by task 7606: kasan_save_stack+0x33/0x50 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:372 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:389 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:711 [inline] hci_conn_add+0xb9/0x1610 net/bluetooth/hci_conn.c:973 hci_conn_add_unset+0x6d/0xf0 net/bluetooth/hci_conn.c:1075 hci_connect_sco+0x3a0/0xf80 net/bluetooth/hci_conn.c:1754 sco_connect net/bluetooth/sco.c:266 [inline] sco_sock_connect+0x2c7/0xa80 net/bluetooth/sco.c:591 __sys_connect_file+0x15b/0x1a0 net/socket.c:2048 __sys_connect+0x145/0x170 net/socket.c:2065 __do_sys_connect net/socket.c:2075 [inline] __se_sys_connect net/socket.c:2072 [inline] __x64_sys_connect+0x72/0xb0 net/socket.c:2072 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Freed by task 4456: kasan_save_stack+0x33/0x50 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3f/0x60 mm/kasan/generic.c:640 poison_slab_object mm/kasan/common.c:241 [inline] __kasan_slab_free+0x121/0x1b0 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+0x124/0x360 mm/slub.c:4409 device_release+0xa1/0x240 drivers/base/core.c:2485 kobject_cleanup lib/kobject.c:682 [inline] kobject_release lib/kobject.c:716 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1d0/0x440 lib/kobject.c:733 put_device+0x1f/0x30 drivers/base/core.c:3733 hci_conn_del_sysfs+0x151/0x180 net/bluetooth/hci_sysfs.c:72 hci_conn_cleanup net/bluetooth/hci_conn.c:177 [inline] hci_conn_del+0x584/0xe10 net/bluetooth/hci_conn.c:1188 hci_abort_conn_sync+0x758/0xb50 net/bluetooth/hci_sync.c:5356 abort_conn_sync+0x187/0x390 net/bluetooth/hci_conn.c:2988 hci_cmd_sync_work+0x1a4/0x410 net/bluetooth/hci_sync.c:306 process_one_work+0x886/0x15d0 kernel/workqueue.c:2633 process_scheduled_works kernel/workqueue.c:2706 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2787 kthread+0x2c6/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 The buggy address belongs to the object at ffff88806cb32000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 16 bytes inside of freed 4096-byte region [ffff88806cb32000, ffff88806cb33000) The buggy address belongs to the physical page: page:ffffea0001b2cc00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6cb30 head:ffffea0001b2cc00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888013042140 dead000000000100 dead000000000122 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 4520, tgid 4520 (udevd), ts 29687780438, free_ts 24269674061 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d0/0x350 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3311 __alloc_pages+0x22f/0x2440 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 mm/slub.c:2190 [inline] allocate_slab mm/slub.c:2354 [inline] new_slab+0xcc/0x3a0 mm/slub.c:2407 ___slab_alloc+0x4af/0x19a0 mm/slub.c:3540 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3625 __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+0x3b4/0x440 mm/slub.c:3994 kmalloc include/linux/slab.h:594 [inline] tomoyo_realpath_from_path+0xb9/0x710 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x2a3/0x3b0 security/tomoyo/file.c:771 tomoyo_file_open security/tomoyo/tomoyo.c:333 [inline] tomoyo_file_open+0xa8/0xd0 security/tomoyo/tomoyo.c:328 security_file_open+0x75/0x620 security/security.c:2932 do_dentry_open+0x583/0x18c0 fs/open.c:940 do_open fs/namei.c:3641 [inline] path_openat+0x1df6/0x2990 fs/namei.c:3798 do_filp_open+0x1de/0x430 fs/namei.c:3825 do_sys_openat2+0x176/0x1e0 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+0x175/0x210 fs/open.c:1430 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+0x51f/0xb10 mm/page_alloc.c:2346 free_unref_page+0x33/0x3c0 mm/page_alloc.c:2486 free_contig_range+0xb6/0x190 mm/page_alloc.c:6535 destroy_args+0xa69/0xe40 mm/debug_vm_pgtable.c:1028 debug_vm_pgtable+0x16fe/0x3250 mm/debug_vm_pgtable.c:1408 do_one_initcall+0x11c/0x650 init/main.c:1236 do_initcall_level init/main.c:1298 [inline] do_initcalls init/main.c:1314 [inline] do_basic_setup init/main.c:1333 [inline] kernel_init_freeable+0x687/0xc10 init/main.c:1551 kernel_init+0x1c/0x2a0 init/main.c:1441 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Memory state around the buggy address: ffff88806cb31f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88806cb31f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88806cb32000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88806cb32080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806cb32100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================