================================================================== 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+0xe4/0x460 net/bluetooth/sco.c:171 Write of size 4 at addr ffff888108788010 by task syz-executor.3/8006 CPU: 0 PID: 8006 Comm: syz-executor.3 Not tainted 6.5.0-rc5-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+0x3d/0x60 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+0xe4/0x460 net/bluetooth/sco.c:171 sco_sock_close net/bluetooth/sco.c:469 [inline] sco_sock_release+0x65/0x280 net/bluetooth/sco.c:1246 __sock_release+0x9b/0x250 net/socket.c:657 sock_close+0x13/0x20 net/socket.c:1399 __fput+0x339/0xa20 fs/file_table.c:384 task_work_run+0x114/0x1f0 kernel/task_work.c:179 get_signal+0x194/0x1f00 kernel/signal.c:2657 arch_do_signal_or_restart+0x89/0x5f0 arch/x86/kernel/signal.c:308 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0xc3/0x150 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x16/0x30 kernel/entry/common.c:297 do_syscall_64+0x44/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f403e47cae9 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:00007f403f1920c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: fffffffffffffffc RBX: 00007f403e59bf80 RCX: 00007f403e47cae9 RDX: 0000000000000008 RSI: 0000000020000040 RDI: 0000000000000004 RBP: 00007f403e4c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000006 R14: 00007f403e59bf80 R15: 00007ffd1b7e2048 Allocated by task 7937: 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:582 [inline] kzalloc include/linux/slab.h:703 [inline] hci_conn_add+0xad/0x14f0 net/bluetooth/hci_conn.c:952 hci_connect_sco+0x2be/0xb70 net/bluetooth/hci_conn.c:1672 sco_connect net/bluetooth/sco.c:266 [inline] sco_sock_connect+0x358/0x8e0 net/bluetooth/sco.c:591 __sys_connect+0xfd/0x120 net/socket.c:2023 __do_sys_connect net/socket.c:2033 [inline] __se_sys_connect net/socket.c:2030 [inline] __x64_sys_connect+0x6d/0xb0 net/socket.c:2030 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 1248: 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:162 [inline] slab_free_hook mm/slub.c:1792 [inline] slab_free_freelist_hook+0x10b/0x1e0 mm/slub.c:1818 slab_free mm/slub.c:3801 [inline] __kmem_cache_free+0xba/0x340 mm/slub.c:3814 device_release+0x97/0x1a0 drivers/base/core.c:2484 kobject_cleanup lib/kobject.c:682 [inline] kobject_release lib/kobject.c:713 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put.part.0+0x167/0x400 lib/kobject.c:730 hci_conn_unlink+0x5d0/0x730 net/bluetooth/hci_conn.c:1071 hci_conn_del+0x4f/0xb70 net/bluetooth/hci_conn.c:1097 hci_abort_conn_sync+0x351/0x870 net/bluetooth/hci_sync.c:5417 hci_cmd_sync_work+0x173/0x340 net/bluetooth/hci_sync.c:306 process_one_work+0x922/0x1370 kernel/workqueue.c:2600 worker_thread+0xfb/0xe40 kernel/workqueue.c:2751 kthread+0x278/0x330 kernel/kthread.c:389 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145 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+0x45/0x360 kernel/workqueue.c:1556 __queue_work+0x554/0xdc0 kernel/workqueue.c:1717 __queue_delayed_work kernel/workqueue.c:1867 [inline] queue_delayed_work_on+0x18d/0x1e0 kernel/workqueue.c:1903 queue_delayed_work include/linux/workqueue.h:521 [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+0x1aa/0x460 net/bluetooth/sco.c:171 sco_sock_close net/bluetooth/sco.c:469 [inline] sco_sock_release+0x65/0x280 net/bluetooth/sco.c:1246 __sock_release+0x9b/0x250 net/socket.c:657 sock_close+0x13/0x20 net/socket.c:1399 __fput+0x339/0xa20 fs/file_table.c:384 task_work_run+0x114/0x1f0 kernel/task_work.c:179 get_signal+0x194/0x1f00 kernel/signal.c:2657 arch_do_signal_or_restart+0x89/0x5f0 arch/x86/kernel/signal.c:308 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0xc3/0x150 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x16/0x30 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 ffff888108788000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 16 bytes inside of freed 4096-byte region [ffff888108788000, ffff888108789000) The buggy address belongs to the physical page: page:ffffea000421e200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x108788 head:ffffea000421e200 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x100000000010200(slab|head|node=0|zone=2) page_type: 0xffffffff() raw: 0100000000010200 ffff888100042140 ffffea0005f72400 dead000000000002 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 3975, tgid 3975 (modprobe), ts 68237910009, free_ts 68064873813 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x281/0x2f0 mm/page_alloc.c:1570 prep_new_page mm/page_alloc.c:1577 [inline] get_page_from_freelist+0x1131/0x3d90 mm/page_alloc.c:3221 __alloc_pages+0x1d0/0x470 mm/page_alloc.c:4477 alloc_slab_page mm/slub.c:1862 [inline] allocate_slab+0x24e/0x360 mm/slub.c:2009 new_slab mm/slub.c:2062 [inline] ___slab_alloc+0x7a7/0x1000 mm/slub.c:3215 __slab_alloc.constprop.0+0x4d/0x90 mm/slub.c:3314 __slab_alloc_node mm/slub.c:3367 [inline] slab_alloc_node mm/slub.c:3460 [inline] __kmem_cache_alloc_node+0x143/0x390 mm/slub.c:3509 __do_kmalloc_node mm/slab_common.c:984 [inline] __kmalloc+0x4c/0x160 mm/slab_common.c:998 kmalloc include/linux/slab.h:586 [inline] tomoyo_realpath_from_path+0xaf/0x7a0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x220/0x2b0 security/tomoyo/file.c:771 security_file_open+0x4f/0x80 security/security.c:2797 do_dentry_open+0x339/0x1200 fs/open.c:901 do_open fs/namei.c:3636 [inline] path_openat+0x18b8/0x27c0 fs/namei.c:3793 do_filp_open+0x1bc/0x400 fs/namei.c:3820 do_sys_openat2+0x12c/0x170 fs/open.c:1407 do_sys_open fs/open.c:1422 [inline] __do_sys_openat fs/open.c:1438 [inline] __se_sys_openat fs/open.c:1433 [inline] __x64_sys_openat+0x134/0x1d0 fs/open.c:1433 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1161 [inline] free_unref_page_prepare+0x5ac/0xcf0 mm/page_alloc.c:2348 free_unref_page+0x33/0x350 mm/page_alloc.c:2443 __unfreeze_partials+0x1f1/0x210 mm/slub.c:2647 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x17d/0x1b0 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x65/0x90 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook mm/slab.h:762 [inline] slab_alloc_node mm/slub.c:3470 [inline] slab_alloc mm/slub.c:3478 [inline] __kmem_cache_alloc_lru mm/slub.c:3485 [inline] kmem_cache_alloc+0x1a1/0x3d0 mm/slub.c:3494 vm_area_alloc+0x1e/0x1e0 kernel/fork.c:485 mmap_region+0x294/0x1f60 mm/mmap.c:2730 do_mmap+0x61a/0xd30 mm/mmap.c:1363 vm_mmap_pgoff+0x16d/0x340 mm/util.c:543 ksys_mmap_pgoff+0x2e4/0x430 mm/mmap.c:1409 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 Memory state around the buggy address: ffff888108787f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888108787f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888108788000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888108788080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888108788100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================