================================================================== BUG: KASAN: slab-use-after-free in __hci_acl_create_connection_sync+0x6e4/0x9c0 net/bluetooth/hci_sync.c:6518 Write of size 2 at addr ffff88803589c036 by task kworker/u9:1/9393 CPU: 0 PID: 9393 Comm: kworker/u9:1 Not tainted 6.8.0-rc4-next-20240214-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Workqueue: hci3 hci_cmd_sync_work Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 __hci_acl_create_connection_sync+0x6e4/0x9c0 net/bluetooth/hci_sync.c:6518 hci_cmd_sync_work+0x22b/0x400 net/bluetooth/hci_sync.c:306 process_one_work kernel/workqueue.c:3146 [inline] process_scheduled_works+0x9d7/0x1730 kernel/workqueue.c:3226 worker_thread+0x86d/0xd70 kernel/workqueue.c:3307 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242 Allocated by task 27302: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace+0x1d9/0x360 mm/slub.c:4013 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:711 [inline] hci_conn_add+0xc7/0x13a0 net/bluetooth/hci_conn.c:914 hci_conn_add_unset net/bluetooth/hci_conn.c:1016 [inline] hci_connect_acl+0x166/0x4b0 net/bluetooth/hci_conn.c:1632 hci_connect_sco+0x47/0x350 net/bluetooth/hci_conn.c:1694 sco_connect net/bluetooth/sco.c:266 [inline] sco_sock_connect+0x2fc/0x990 net/bluetooth/sco.c:592 __sys_connect_file net/socket.c:2048 [inline] __sys_connect+0x2df/0x310 net/socket.c:2065 __do_sys_connect net/socket.c:2075 [inline] __se_sys_connect net/socket.c:2072 [inline] __x64_sys_connect+0x7a/0x90 net/socket.c:2072 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Freed by task 9393: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:586 poison_slab_object+0xa6/0xe0 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2122 [inline] slab_free mm/slub.c:4296 [inline] kfree+0x14a/0x380 mm/slub.c:4406 device_release+0x99/0x1c0 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x22f/0x480 lib/kobject.c:737 hci_conn_cleanup net/bluetooth/hci_conn.c:176 [inline] hci_conn_del+0x8f0/0xc70 net/bluetooth/hci_conn.c:1126 hci_abort_conn_sync+0x583/0xde0 net/bluetooth/hci_sync.c:5361 __hci_acl_create_connection_sync+0x622/0x9c0 net/bluetooth/hci_sync.c:6554 hci_cmd_sync_work+0x22b/0x400 net/bluetooth/hci_sync.c:306 process_one_work kernel/workqueue.c:3146 [inline] process_scheduled_works+0x9d7/0x1730 kernel/workqueue.c:3226 worker_thread+0x86d/0xd70 kernel/workqueue.c:3307 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242 The buggy address belongs to the object at ffff88803589c000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 54 bytes inside of freed 4096-byte region [ffff88803589c000, ffff88803589d000) The buggy address belongs to the physical page: page:ffffea0000d62600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x35898 head:ffffea0000d62600 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff80000000840(slab|head|node=0|zone=1|lastcpupid=0xfff) page_type: 0xffffffff() raw: 00fff80000000840 ffff888014c42140 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 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5093, tgid 5093 (syz-executor.4), ts 166200135395, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311 __alloc_pages+0x256/0x6a0 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+0x5f/0x160 mm/slub.c:2191 allocate_slab mm/slub.c:2354 [inline] new_slab+0x84/0x2f0 mm/slub.c:2407 ___slab_alloc+0xc73/0x1260 mm/slub.c:3541 __slab_alloc mm/slub.c:3626 [inline] __slab_alloc_node mm/slub.c:3679 [inline] slab_alloc_node mm/slub.c:3851 [inline] __do_kmalloc_node mm/slub.c:3981 [inline] __kmalloc+0x2e3/0x4a0 mm/slub.c:3995 kmalloc include/linux/slab.h:594 [inline] tomoyo_realpath_from_path+0xcf/0x5e0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x255/0x500 security/tomoyo/file.c:771 security_file_open+0x69/0x570 security/security.c:2932 do_dentry_open+0x327/0x15a0 fs/open.c:943 do_open fs/namei.c:3639 [inline] path_openat+0x2860/0x3240 fs/namei.c:3796 do_filp_open+0x235/0x490 fs/namei.c:3823 do_sys_openat2+0x13e/0x1d0 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+0x247/0x2a0 fs/open.c:1433 do_syscall_64+0xfb/0x240 page_owner free stack trace missing Memory state around the buggy address: ffff88803589bf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88803589bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88803589c000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88803589c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88803589c100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================