================================================================== BUG: KASAN: use-after-free in instrument_atomic_write include/linux/instrumented.h:71 [inline] BUG: KASAN: use-after-free in atomic_dec_and_test include/asm-generic/atomic-instrumented.h:748 [inline] BUG: KASAN: use-after-free in hci_conn_drop include/net/bluetooth/hci_core.h:1116 [inline] BUG: KASAN: use-after-free in sco_chan_del net/bluetooth/sco.c:149 [inline] BUG: KASAN: use-after-free in __sco_sock_close+0x47c/0xed0 net/bluetooth/sco.c:434 Write of size 4 at addr ffff8880a6ff8010 by task syz-executor236/7006 CPU: 0 PID: 7006 Comm: syz-executor236 Not tainted 5.8.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1f0/0x31e lib/dump_stack.c:118 print_address_description+0x66/0x5a0 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report+0x132/0x1d0 mm/kasan/report.c:530 check_memory_region_inline mm/kasan/generic.c:183 [inline] check_memory_region+0x2b5/0x2f0 mm/kasan/generic.c:192 instrument_atomic_write include/linux/instrumented.h:71 [inline] atomic_dec_and_test include/asm-generic/atomic-instrumented.h:748 [inline] hci_conn_drop include/net/bluetooth/hci_core.h:1116 [inline] sco_chan_del net/bluetooth/sco.c:149 [inline] __sco_sock_close+0x47c/0xed0 net/bluetooth/sco.c:434 sco_sock_close net/bluetooth/sco.c:448 [inline] sco_sock_release+0x63/0x4f0 net/bluetooth/sco.c:1053 __sock_release net/socket.c:596 [inline] sock_close+0xd8/0x260 net/socket.c:1277 __fput+0x2f0/0x750 fs/file_table.c:281 task_work_run+0x137/0x1c0 kernel/task_work.c:135 exit_task_work include/linux/task_work.h:25 [inline] do_exit+0x5f3/0x1f20 kernel/exit.c:806 do_group_exit+0x161/0x2d0 kernel/exit.c:903 get_signal+0x139b/0x1d30 kernel/signal.c:2743 arch_do_signal+0x33/0x610 arch/x86/kernel/signal.c:811 exit_to_user_mode_loop kernel/entry/common.c:135 [inline] exit_to_user_mode_prepare+0x8d/0x1c0 kernel/entry/common.c:166 syscall_exit_to_user_mode+0x5e/0x1a0 kernel/entry/common.c:241 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x446eb9 Code: Bad RIP value. RSP: 002b:00007ffe6f094b58 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: fffffffffffffffc RBX: 0000000000000003 RCX: 0000000000446eb9 RDX: 0000000000000008 RSI: 00000000200000c0 RDI: 0000000000000004 RBP: 0000000000000004 R08: 0000000000000002 R09: 00000000000300ff R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000407b10 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 7006: save_stack mm/kasan/common.c:48 [inline] set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc+0x103/0x140 mm/kasan/common.c:494 kmem_cache_alloc_trace+0x234/0x300 mm/slab.c:3551 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:669 [inline] hci_conn_add+0x5d/0x1040 net/bluetooth/hci_conn.c:525 hci_connect_sco+0x2aa/0xa20 net/bluetooth/hci_conn.c:1283 sco_connect net/bluetooth/sco.c:241 [inline] sco_sock_connect+0x2de/0xaa0 net/bluetooth/sco.c:588 __sys_connect_file net/socket.c:1853 [inline] __sys_connect+0x2da/0x360 net/socket.c:1870 __do_sys_connect net/socket.c:1881 [inline] __se_sys_connect net/socket.c:1878 [inline] __x64_sys_connect+0x76/0x80 net/socket.c:1878 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 7005: save_stack mm/kasan/common.c:48 [inline] set_track mm/kasan/common.c:56 [inline] kasan_set_free_info mm/kasan/common.c:316 [inline] __kasan_slab_free+0x114/0x170 mm/kasan/common.c:455 __cache_free mm/slab.c:3426 [inline] kfree+0x10a/0x220 mm/slab.c:3757 device_release+0x70/0x1a0 drivers/base/core.c:1796 kobject_cleanup lib/kobject.c:704 [inline] kobject_release lib/kobject.c:735 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1a0/0x2c0 lib/kobject.c:752 hci_conn_del+0x2c2/0x550 net/bluetooth/hci_conn.c:645 hci_phy_link_complete_evt net/bluetooth/hci_event.c:4940 [inline] hci_event_packet+0x82c8/0x17e10 net/bluetooth/hci_event.c:6205 hci_rx_work+0x246/0xa20 net/bluetooth/hci_core.c:4889 process_one_work+0x789/0xfc0 kernel/workqueue.c:2269 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2415 kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 The buggy address belongs to the object at ffff8880a6ff8000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 16 bytes inside of 4096-byte region [ffff8880a6ff8000, ffff8880a6ff9000) The buggy address belongs to the page: page:ffffea00029bfe00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 head:ffffea00029bfe00 order:1 compound_mapcount:0 flags: 0xfffe0000010200(slab|head) raw: 00fffe0000010200 ffffea00024f5608 ffffea00029bf888 ffff8880aa402000 raw: 0000000000000000 ffff8880a6ff8000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a6ff7f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880a6ff7f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880a6ff8000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a6ff8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a6ff8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================