================================================================== 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:575 [inline] BUG: KASAN: slab-use-after-free in hci_conn_drop+0x34/0x2c0 include/net/bluetooth/hci_core.h:1420 Write of size 4 at addr ffff88802a078010 by task syz-executor.4/6035 CPU: 1 PID: 6035 Comm: syz-executor.4 Not tainted 6.4.0-rc7-syzkaller-g007034977130 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:351 [inline] print_report+0x163/0x540 mm/kasan/report.c:462 kasan_report+0x176/0x1b0 mm/kasan/report.c:572 kasan_check_range+0x283/0x290 mm/kasan/generic.c:187 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_dec_and_test include/linux/atomic/atomic-instrumented.h:575 [inline] hci_conn_drop+0x34/0x2c0 include/net/bluetooth/hci_core.h:1420 sco_chan_del+0xeb/0x1d0 net/bluetooth/sco.c:169 sco_sock_close net/bluetooth/sco.c:469 [inline] sco_sock_release+0xb3/0x320 net/bluetooth/sco.c:1267 __sock_release net/socket.c:653 [inline] sock_close+0xd1/0x230 net/socket.c:1397 __fput+0x3b7/0x890 fs/file_table.c:321 task_work_run+0x24a/0x300 kernel/task_work.c:179 get_signal+0x160e/0x17e0 kernel/signal.c:2652 arch_do_signal_or_restart+0x91/0x670 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:297 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x464769 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6a0ef28188 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: fffffffffffffffc RBX: 000000000055bf00 RCX: 0000000000464769 RDX: 0000000000000008 RSI: 0000000020000000 RDI: 0000000000000006 RBP: 00000000004ae608 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000055bf00 R13: 00007ffd3b939bef R14: 00007f6a0ef28300 R15: 0000000000022000 Allocated by task 6035: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:680 [inline] hci_conn_add+0xc3/0x13a0 net/bluetooth/hci_conn.c:991 hci_connect_sco+0x8e/0x2b0 net/bluetooth/hci_conn.c:1674 sco_connect net/bluetooth/sco.c:264 [inline] sco_sock_connect+0x2b9/0x990 net/bluetooth/sco.c:610 __sys_connect_file net/socket.c:2003 [inline] __sys_connect+0x2cd/0x300 net/socket.c:2020 __do_sys_connect net/socket.c:2030 [inline] __se_sys_connect net/socket.c:2027 [inline] __x64_sys_connect+0x7a/0x90 net/socket.c:2027 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 5178: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:521 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook mm/slub.c:1807 [inline] slab_free mm/slub.c:3786 [inline] __kmem_cache_free+0x264/0x3c0 mm/slub.c:3799 device_release+0x95/0x1c0 kobject_cleanup lib/kobject.c:683 [inline] kobject_release lib/kobject.c:714 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x228/0x470 lib/kobject.c:731 hci_sco_setup+0x3fb/0x580 net/bluetooth/hci_conn.c:658 hci_conn_complete_evt+0x234/0xf00 net/bluetooth/hci_event.c:3229 hci_event_func net/bluetooth/hci_event.c:7485 [inline] hci_event_packet+0x970/0x1360 net/bluetooth/hci_event.c:7537 hci_rx_work+0x446/0xa90 net/bluetooth/hci_core.c:4064 process_one_work+0x8a0/0x10e0 kernel/workqueue.c:2405 worker_thread+0xa63/0x1210 kernel/workqueue.c:2552 kthread+0x2b8/0x350 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 The buggy address belongs to the object at ffff88802a078000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 16 bytes inside of freed 4096-byte region [ffff88802a078000, ffff88802a079000) The buggy address belongs to the physical page: page:ffffea0000a81e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2a078 head:ffffea0000a81e00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000010200 ffff888012442140 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 0x1d2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 4447, tgid 4447 (udevd), ts 89166421436, free_ts 82838372232 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1731 prep_new_page mm/page_alloc.c:1738 [inline] get_page_from_freelist+0x321c/0x33a0 mm/page_alloc.c:3502 __alloc_pages+0x255/0x670 mm/page_alloc.c:4768 alloc_slab_page+0x6a/0x160 mm/slub.c:1851 allocate_slab mm/slub.c:1998 [inline] new_slab+0x84/0x2f0 mm/slub.c:2051 ___slab_alloc+0xa85/0x10a0 mm/slub.c:3192 __slab_alloc mm/slub.c:3291 [inline] __slab_alloc_node mm/slub.c:3344 [inline] slab_alloc_node mm/slub.c:3441 [inline] __kmem_cache_alloc_node+0x1b8/0x290 mm/slub.c:3490 __do_kmalloc_node mm/slab_common.c:965 [inline] __kmalloc+0xa8/0x230 mm/slab_common.c:979 kmalloc include/linux/slab.h:563 [inline] tomoyo_realpath_from_path+0xcf/0x5e0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_number_perm+0x210/0x840 security/tomoyo/file.c:723 tomoyo_path_mknod+0x176/0x1b0 security/tomoyo/tomoyo.c:251 security_path_mknod+0xf5/0x150 security/security.c:1676 may_o_create fs/namei.c:3314 [inline] lookup_open fs/namei.c:3455 [inline] open_last_lookups fs/namei.c:3560 [inline] path_openat+0xc30/0x3170 fs/namei.c:3788 do_filp_open+0x234/0x490 fs/namei.c:3818 do_sys_openat2+0x13f/0x500 fs/open.c:1356 do_sys_open fs/open.c:1372 [inline] __do_sys_openat fs/open.c:1388 [inline] __se_sys_openat fs/open.c:1383 [inline] __x64_sys_openat+0x247/0x290 fs/open.c:1383 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1302 [inline] free_unref_page_prepare+0x903/0xa30 mm/page_alloc.c:2564 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2659 qlist_free_all+0x22/0x60 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x14b/0x160 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x23/0x70 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook+0x68/0x3a0 mm/slab.h:711 slab_alloc_node mm/slub.c:3451 [inline] kmem_cache_alloc_node+0x157/0x350 mm/slub.c:3496 __alloc_skb+0x181/0x420 net/core/skbuff.c:644 alloc_skb include/linux/skbuff.h:1288 [inline] nlmsg_new include/net/netlink.h:1003 [inline] rtmsg_ifinfo_build_skb+0x84/0x280 net/core/rtnetlink.c:4008 rtmsg_ifinfo_event net/core/rtnetlink.c:4051 [inline] rtmsg_ifinfo+0x91/0x1b0 net/core/rtnetlink.c:4060 netdev_state_change+0x1c8/0x250 net/core/dev.c:1319 linkwatch_do_dev+0x10c/0x160 net/core/link_watch.c:182 __linkwatch_run_queue+0x44c/0x6c0 net/core/link_watch.c:235 linkwatch_event+0x4c/0x60 net/core/link_watch.c:278 process_one_work+0x8a0/0x10e0 kernel/workqueue.c:2405 worker_thread+0xa63/0x1210 kernel/workqueue.c:2552 Memory state around the buggy address: ffff88802a077f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802a077f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802a078000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802a078080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802a078100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================