================================================================== 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:1497 [inline] BUG: KASAN: slab-use-after-free in sco_chan_del+0x102/0x4f0 net/bluetooth/sco.c:171 Write of size 4 at addr ffff88801d202010 by task syz-executor.2/6546 CPU: 1 PID: 6546 Comm: syz-executor.2 Not tainted 6.5.0-rc6-next-20230817-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 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:364 [inline] print_report+0xc4/0x620 mm/kasan/report.c:475 kasan_report+0xda/0x110 mm/kasan/report.c:588 check_region_inline mm/kasan/generic.c:181 [inline] kasan_check_range+0xef/0x190 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:1375 [inline] hci_conn_drop include/net/bluetooth/hci_core.h:1497 [inline] sco_chan_del+0x102/0x4f0 net/bluetooth/sco.c:171 __sco_sock_close+0xf2/0x690 net/bluetooth/sco.c:454 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:1401 __fput+0x3f7/0xac0 fs/file_table.c:384 task_work_run+0x14d/0x240 kernel/task_work.c:179 get_signal+0x106f/0x27b0 kernel/signal.c:2668 arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:309 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x1d/0x60 kernel/entry/common.c:297 do_syscall_64+0x44/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f6da067cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6da13cd0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: fffffffffffffffc RBX: 00007f6da079bf80 RCX: 00007f6da067cae9 RDX: 0000000000000008 RSI: 0000000020000100 RDI: 0000000000000004 RBP: 00007f6da06c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f6da079bf80 R15: 00007ffcc391d598 Allocated by task 6531: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:721 [inline] hci_conn_add+0xc2/0x1770 net/bluetooth/hci_conn.c:952 hci_connect_sco+0x3ac/0xf80 net/bluetooth/hci_conn.c:1671 sco_connect net/bluetooth/sco.c:266 [inline] sco_sock_connect+0x2c7/0xa50 net/bluetooth/sco.c:591 __sys_connect_file+0x15b/0x1a0 net/socket.c:2032 __sys_connect+0x145/0x170 net/socket.c:2049 __do_sys_connect net/socket.c:2059 [inline] __se_sys_connect net/socket.c:2056 [inline] __x64_sys_connect+0x72/0xb0 net/socket.c:2056 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 5081: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x15e/0x1b0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1800 [inline] slab_free_freelist_hook+0x114/0x1e0 mm/slub.c:1826 slab_free mm/slub.c:3809 [inline] __kmem_cache_free+0xb8/0x2f0 mm/slub.c:3822 device_release+0xa1/0x240 drivers/base/core.c:2484 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1f7/0x5b0 lib/kobject.c:737 put_device+0x1f/0x30 drivers/base/core.c:3731 hci_conn_unlink+0x60a/0x840 net/bluetooth/hci_conn.c:1071 hci_conn_del+0x59/0xd10 net/bluetooth/hci_conn.c:1097 hci_abort_conn_sync+0x7fc/0xb70 net/bluetooth/hci_sync.c:5417 abort_conn_sync+0x18e/0x3a0 net/bluetooth/hci_conn.c:2869 hci_cmd_sync_work+0x1a4/0x3c0 net/bluetooth/hci_sync.c:306 process_one_work+0x887/0x15d0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8bb/0x1290 kernel/workqueue.c:2784 kthread+0x33a/0x430 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:304 Last potentially related work creation: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:492 insert_work+0x38/0x230 kernel/workqueue.c:1647 __queue_work+0x5d2/0x1060 kernel/workqueue.c:1799 __queue_delayed_work+0x1bf/0x260 kernel/workqueue.c:1950 queue_delayed_work_on+0x106/0x130 kernel/workqueue.c:1986 queue_delayed_work include/linux/workqueue.h:569 [inline] hci_conn_drop include/net/bluetooth/hci_core.h:1523 [inline] hci_conn_drop include/net/bluetooth/hci_core.h:1493 [inline] sco_chan_del+0x1f8/0x4f0 net/bluetooth/sco.c:171 __sco_sock_close+0xf2/0x690 net/bluetooth/sco.c:454 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:1401 __fput+0x3f7/0xac0 fs/file_table.c:384 task_work_run+0x14d/0x240 kernel/task_work.c:179 get_signal+0x106f/0x27b0 kernel/signal.c:2668 arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:309 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x1d/0x60 kernel/entry/common.c:297 do_syscall_64+0x44/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88801d202000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 16 bytes inside of freed 4096-byte region [ffff88801d202000, ffff88801d203000) The buggy address belongs to the physical page: page:ffffea0000748000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1d200 head:ffffea0000748000 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000010200 ffff888012c42140 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 9078140079, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d2/0x350 mm/page_alloc.c:1550 prep_new_page mm/page_alloc.c:1557 [inline] get_page_from_freelist+0x10d7/0x31b0 mm/page_alloc.c:3233 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4489 alloc_page_interleave+0x1e/0x250 mm/mempolicy.c:2131 alloc_pages+0x22a/0x270 mm/mempolicy.c:2293 alloc_slab_page mm/slub.c:1870 [inline] allocate_slab+0x24e/0x380 mm/slub.c:2017 new_slab mm/slub.c:2070 [inline] ___slab_alloc+0x8bc/0x1570 mm/slub.c:3223 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3322 __slab_alloc_node mm/slub.c:3375 [inline] slab_alloc_node mm/slub.c:3468 [inline] __kmem_cache_alloc_node+0x137/0x350 mm/slub.c:3517 kmalloc_trace+0x25/0xe0 mm/slab_common.c:1095 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:721 [inline] kobject_uevent_env+0x24c/0x1800 lib/kobject_uevent.c:524 driver_register+0x2cf/0x4a0 drivers/base/driver.c:254 do_one_initcall+0x117/0x630 init/main.c:1232 do_initcall_level init/main.c:1294 [inline] do_initcalls init/main.c:1310 [inline] do_basic_setup init/main.c:1329 [inline] kernel_init_freeable+0x5c2/0x900 init/main.c:1547 kernel_init+0x1c/0x2a0 init/main.c:1437 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 page_owner free stack trace missing Memory state around the buggy address: ffff88801d201f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801d201f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88801d202000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801d202080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801d202100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================