================================================================== BUG: KASAN: slab-use-after-free in __list_del_entry_valid_or_report+0x1a6/0x1c0 lib/list_debug.c:62 Read of size 8 at addr ffff888060bda550 by task kworker/u33:4/5348 CPU: 1 UID: 0 PID: 5348 Comm: kworker/u33:4 Not tainted 6.12.0-rc1-syzkaller-00031-ge32cde8d2bd7 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: hci6 hci_error_reset Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 __list_del_entry_valid_or_report+0x1a6/0x1c0 lib/list_debug.c:62 __list_del_entry_valid include/linux/list.h:124 [inline] __list_del_entry include/linux/list.h:215 [inline] list_del_init include/linux/list.h:287 [inline] bt_accept_unlink+0x34/0x2e0 net/bluetooth/af_bluetooth.c:234 l2cap_sock_teardown_cb+0x1a3/0x3c0 net/bluetooth/l2cap_sock.c:1599 l2cap_chan_del+0xba/0x900 net/bluetooth/l2cap_core.c:658 l2cap_conn_del+0x37c/0x730 net/bluetooth/l2cap_core.c:1785 l2cap_disconn_cfm net/bluetooth/l2cap_core.c:7307 [inline] l2cap_disconn_cfm+0x96/0xd0 net/bluetooth/l2cap_core.c:7300 hci_disconn_cfm include/net/bluetooth/hci_core.h:1975 [inline] hci_conn_hash_flush+0x114/0x260 net/bluetooth/hci_conn.c:2589 hci_dev_close_sync+0x59e/0x1110 net/bluetooth/hci_sync.c:5195 hci_dev_do_close+0x2e/0x90 net/bluetooth/hci_core.c:483 hci_error_reset+0xbf/0x320 net/bluetooth/hci_core.c:1016 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 6828: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:257 [inline] __do_kmalloc_node mm/slub.c:4265 [inline] __kmalloc_noprof+0x1e8/0x400 mm/slub.c:4277 kmalloc_noprof include/linux/slab.h:882 [inline] sk_prot_alloc+0x1a8/0x2a0 net/core/sock.c:2164 sk_alloc+0x36/0xb90 net/core/sock.c:2217 bt_sock_alloc+0x3b/0x3a0 net/bluetooth/af_bluetooth.c:148 l2cap_sock_alloc.constprop.0+0x35/0x180 net/bluetooth/l2cap_sock.c:1877 l2cap_sock_create+0x123/0x1f0 net/bluetooth/l2cap_sock.c:1917 bt_sock_create+0x182/0x350 net/bluetooth/af_bluetooth.c:132 __sock_create+0x32e/0x800 net/socket.c:1576 sock_create net/socket.c:1627 [inline] __sys_socket_create net/socket.c:1664 [inline] __sys_socket+0x14f/0x260 net/socket.c:1711 __do_sys_socket net/socket.c:1725 [inline] __se_sys_socket net/socket.c:1723 [inline] __x64_sys_socket+0x72/0xb0 net/socket.c:1723 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6826: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:2343 [inline] slab_free mm/slub.c:4580 [inline] kfree+0x14f/0x4b0 mm/slub.c:4728 sk_prot_free net/core/sock.c:2200 [inline] __sk_destruct+0x5eb/0x720 net/core/sock.c:2292 sk_destruct+0xc2/0xf0 net/core/sock.c:2307 __sk_free+0xf4/0x3e0 net/core/sock.c:2318 sk_free+0x6a/0x90 net/core/sock.c:2329 sock_put include/net/sock.h:1886 [inline] l2cap_sock_kill net/bluetooth/l2cap_sock.c:1250 [inline] l2cap_sock_kill+0x171/0x2d0 net/bluetooth/l2cap_sock.c:1235 l2cap_sock_release+0x189/0x210 net/bluetooth/l2cap_sock.c:1421 __sock_release+0xb0/0x270 net/socket.c:658 sock_close+0x1c/0x30 net/socket.c:1426 __fput+0x3f6/0xb60 fs/file_table.c:431 task_work_run+0x14e/0x250 kernel/task_work.c:228 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888060bda000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1360 bytes inside of freed 2048-byte region [ffff888060bda000, ffff888060bda800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x60bd8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801b042f00 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000080008 00000001f5000000 0000000000000000 head: 00fff00000000040 ffff88801b042f00 dead000000000100 dead000000000122 head: 0000000000000000 0000000000080008 00000001f5000000 0000000000000000 head: 00fff00000000003 ffffea000182f601 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 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 69, tgid 69 (kworker/u32:4), ts 99405147984, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1545 [inline] get_page_from_freelist+0x101e/0x3070 mm/page_alloc.c:3457 __alloc_pages_noprof+0x223/0x25c0 mm/page_alloc.c:4733 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265 alloc_slab_page mm/slub.c:2413 [inline] allocate_slab mm/slub.c:2579 [inline] new_slab+0x2ba/0x3f0 mm/slub.c:2632 ___slab_alloc+0xdac/0x1880 mm/slub.c:3819 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3909 __slab_alloc_node mm/slub.c:3962 [inline] slab_alloc_node mm/slub.c:4123 [inline] __do_kmalloc_node mm/slub.c:4264 [inline] __kmalloc_node_track_caller_noprof+0x355/0x430 mm/slub.c:4284 kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:609 __alloc_skb+0x164/0x380 net/core/skbuff.c:678 alloc_skb include/linux/skbuff.h:1322 [inline] alloc_skb_with_frags+0xe4/0x850 net/core/skbuff.c:6612 sock_alloc_send_pskb+0x7f1/0x980 net/core/sock.c:2883 sock_alloc_send_skb include/net/sock.h:1780 [inline] mld_newpack.isra.0+0x1ed/0x790 net/ipv6/mcast.c:1747 add_grhead+0x299/0x340 net/ipv6/mcast.c:1850 add_grec+0x111e/0x1670 net/ipv6/mcast.c:1988 mld_send_initial_cr.part.0+0xe2/0x260 net/ipv6/mcast.c:2234 page_owner free stack trace missing Memory state around the buggy address: ffff888060bda400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888060bda480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888060bda500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888060bda580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888060bda600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================