================================================================== BUG: KASAN: slab-use-after-free in hci_chan_del+0x35/0x190 net/bluetooth/hci_conn.c:2853 Read of size 8 at addr ffff88801f47af18 by task syz.2.28/4119 CPU: 1 UID: 0 PID: 4119 Comm: syz.2.28 Not tainted 6.13.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x108/0x280 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x169/0x550 mm/kasan/report.c:489 kasan_report+0x143/0x180 mm/kasan/report.c:602 hci_chan_del+0x35/0x190 net/bluetooth/hci_conn.c:2853 l2cap_conn_free net/bluetooth/l2cap_core.c:1816 [inline] kref_put include/linux/kref.h:65 [inline] l2cap_conn_put+0x5a/0xb0 net/bluetooth/l2cap_core.c:1830 l2cap_sock_shutdown+0x837/0xce0 net/bluetooth/l2cap_sock.c:1377 l2cap_sock_release+0x6a/0x1c0 net/bluetooth/l2cap_sock.c:1416 __sock_release net/socket.c:642 [inline] sock_close+0xb4/0x220 net/socket.c:1421 __fput+0x1aa/0x7a0 fs/file_table.c:450 task_work_run+0x20f/0x290 kernel/task_work.c:239 get_signal+0xebd/0xfd0 kernel/signal.c:2790 arch_do_signal_or_restart+0x91/0x670 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x65/0x1f0 kernel/entry/common.c:218 do_syscall_64+0xed/0x220 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f34c9b8cda9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f34caa99038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: fffffffffffffffc RBX: 00007f34c9da5fa0 RCX: 00007f34c9b8cda9 RDX: 000000000000000e RSI: 0000000020000100 RDI: 0000000000000004 RBP: 00007f34c9c0e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f34c9da5fa0 R15: 00007ffd2ace1f18 Allocated by task 4119: 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:377 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x242/0x3e0 mm/slub.c:4329 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] hci_chan_create+0xa8/0x2b0 net/bluetooth/hci_conn.c:2838 l2cap_conn_add+0x5c/0x830 net/bluetooth/l2cap_core.c:6864 l2cap_chan_connect+0x467/0xda0 net/bluetooth/l2cap_core.c:7059 l2cap_sock_connect+0x442/0x780 net/bluetooth/l2cap_sock.c:256 __sys_connect_file net/socket.c:2068 [inline] __sys_connect+0x251/0x280 net/socket.c:2087 __do_sys_connect net/socket.c:2093 [inline] __se_sys_connect net/socket.c:2090 [inline] __x64_sys_connect+0x75/0x90 net/socket.c:2090 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xe0/0x220 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 50: 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:582 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2353 [inline] slab_free mm/slub.c:4613 [inline] kfree+0x196/0x430 mm/slub.c:4761 hci_chan_list_flush net/bluetooth/hci_conn.c:2878 [inline] hci_conn_cleanup net/bluetooth/hci_conn.c:149 [inline] hci_conn_del+0x4ff/0xa70 net/bluetooth/hci_conn.c:1164 hci_conn_failed+0x2a1/0x390 net/bluetooth/hci_conn.c:1267 hci_abort_conn_sync+0x51f/0xed0 net/bluetooth/hci_sync.c:5588 hci_cmd_sync_work+0x210/0x3a0 net/bluetooth/hci_sync.c:332 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0x96c/0x1520 kernel/workqueue.c:3310 worker_thread+0x70b/0xac0 kernel/workqueue.c:3391 kthread+0x28f/0x310 kernel/kthread.c:389 ret_from_fork+0x32/0x60 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff88801f47af00 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 24 bytes inside of freed 128-byte region [ffff88801f47af00, ffff88801f47af80) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1f47a flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff888010841a00 ffffea0001fd97c0 0000000000000006 raw: 0000000000000000 0000000080100010 00000001f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 2286, tgid 2286 (udevd), ts 11242678081, free_ts 11241930481 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x10f/0x130 mm/page_alloc.c:1558 prep_new_page mm/page_alloc.c:1566 [inline] get_page_from_freelist+0x3e6c/0x40e0 mm/page_alloc.c:3476 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4753 alloc_pages_mpol_noprof+0x284/0x4d0 mm/mempolicy.c:2269 alloc_slab_page+0x6a/0x110 mm/slub.c:2423 allocate_slab+0x5d/0x260 mm/slub.c:2589 new_slab mm/slub.c:2642 [inline] ___slab_alloc+0xb01/0x1270 mm/slub.c:3830 __slab_alloc mm/slub.c:3920 [inline] __slab_alloc_node mm/slub.c:3995 [inline] slab_alloc_node mm/slub.c:4156 [inline] __kmalloc_cache_noprof+0x29f/0x3e0 mm/slub.c:4324 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] kernfs_get_open_node fs/kernfs/file.c:525 [inline] kernfs_fop_open+0x692/0xb00 fs/kernfs/file.c:700 do_dentry_open+0x74f/0x10d0 fs/open.c:945 vfs_open+0x36/0x290 fs/open.c:1075 do_open fs/namei.c:3828 [inline] path_openat+0x2781/0x2fa0 fs/namei.c:3987 do_filp_open+0x274/0x480 fs/namei.c:4014 do_sys_openat2+0xf6/0x180 fs/open.c:1402 do_sys_open fs/open.c:1417 [inline] __do_sys_openat fs/open.c:1433 [inline] __se_sys_openat fs/open.c:1428 [inline] __x64_sys_openat+0x20d/0x260 fs/open.c:1428 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xe0/0x220 arch/x86/entry/common.c:83 page last free pid 2286 tgid 2286 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_page+0xcb4/0xf30 mm/page_alloc.c:2659 __slab_free+0x297/0x360 mm/slub.c:4524 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4119 [inline] slab_alloc_node mm/slub.c:4168 [inline] kmem_cache_alloc_noprof+0x1cf/0x3e0 mm/slub.c:4175 getname_flags+0x9d/0x440 fs/namei.c:139 getname fs/namei.c:223 [inline] __do_sys_rename fs/namei.c:5271 [inline] __se_sys_rename fs/namei.c:5269 [inline] __x64_sys_rename+0x58/0x90 fs/namei.c:5269 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xe0/0x220 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88801f47ae00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801f47ae80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88801f47af00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801f47af80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801f47b000: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================