================================================================== BUG: KASAN: slab-use-after-free in mgmt_remove_adv_monitor_sync+0xe2/0xf0 net/bluetooth/mgmt.c:5532 Read of size 8 at addr ffff88802ab7fd18 by task kworker/u33:1/5312 CPU: 0 UID: 0 PID: 5312 Comm: kworker/u33:1 Not tainted 6.12.0-syzkaller-09073-g9f16d5e6f220 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: hci0 hci_cmd_sync_work 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:378 [inline] print_report+0xc3/0x620 mm/kasan/report.c:489 kasan_report+0xd9/0x110 mm/kasan/report.c:602 mgmt_remove_adv_monitor_sync+0xe2/0xf0 net/bluetooth/mgmt.c:5532 hci_cmd_sync_work+0x1a4/0x410 net/bluetooth/hci_sync.c:332 process_one_work+0x958/0x1b30 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 12476: 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 kmalloc_noprof include/linux/slab.h:879 [inline] kzalloc_noprof include/linux/slab.h:1015 [inline] mgmt_pending_new+0x5b/0x290 net/bluetooth/mgmt_util.c:269 mgmt_pending_add+0x36/0x160 net/bluetooth/mgmt_util.c:296 remove_adv_monitor+0x124/0x1b0 net/bluetooth/mgmt.c:5557 hci_mgmt_cmd net/bluetooth/hci_sock.c:1712 [inline] hci_sock_sendmsg+0x1528/0x25e0 net/bluetooth/hci_sock.c:1832 sock_sendmsg_nosec net/socket.c:711 [inline] __sock_sendmsg net/socket.c:726 [inline] sock_write_iter+0x4fe/0x5b0 net/socket.c:1147 new_sync_write fs/read_write.c:586 [inline] vfs_write+0x5ae/0x1150 fs/read_write.c:679 ksys_write+0x207/0x250 fs/read_write.c:731 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e Freed by task 6092: 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:233 [inline] slab_free_hook mm/slub.c:2342 [inline] slab_free mm/slub.c:4579 [inline] kfree+0x14f/0x4b0 mm/slub.c:4727 cmd_status_rsp net/bluetooth/mgmt.c:1452 [inline] cmd_complete_rsp+0x16d/0x1e0 net/bluetooth/mgmt.c:1471 mgmt_pending_foreach+0xdf/0x140 net/bluetooth/mgmt_util.c:259 __mgmt_power_off+0x12f/0x2c0 net/bluetooth/mgmt.c:9534 hci_dev_close_sync+0xd37/0x1250 net/bluetooth/hci_sync.c:5208 hci_dev_do_close+0x2e/0x90 net/bluetooth/hci_core.c:483 hci_rfkill_set_block+0x225/0x360 net/bluetooth/hci_core.c:911 rfkill_set_block+0x203/0x560 net/rfkill/core.c:346 rfkill_epo+0x8e/0x1d0 net/rfkill/core.c:466 __rfkill_handle_global_op net/rfkill/input.c:60 [inline] rfkill_op_handler+0x25a/0x270 net/rfkill/input.c:108 process_one_work+0x958/0x1b30 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 The buggy address belongs to the object at ffff88802ab7fd00 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 24 bytes inside of freed 96-byte region [ffff88802ab7fd00, ffff88802ab7fd60) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2ab7f anon flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801ac42280 ffffea0000899f00 dead000000000005 raw: 0000000000000000 0000000000200020 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 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 0, tgid 0 (swapper/0), ts 67455672525, free_ts 53173230563 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1556 prep_new_page mm/page_alloc.c:1564 [inline] get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3474 __alloc_pages_noprof+0x223/0x25a0 mm/page_alloc.c:4751 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265 alloc_slab_page mm/slub.c:2412 [inline] allocate_slab mm/slub.c:2578 [inline] new_slab+0x2c9/0x410 mm/slub.c:2631 ___slab_alloc+0xd3b/0x1760 mm/slub.c:3818 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3908 __slab_alloc_node mm/slub.c:3961 [inline] slab_alloc_node mm/slub.c:4122 [inline] __kmalloc_cache_noprof+0x2c5/0x310 mm/slub.c:4290 kmalloc_noprof include/linux/slab.h:879 [inline] dst_cow_metrics_generic+0x4c/0x1e0 net/core/dst.c:185 dst_metrics_write_ptr include/net/dst.h:133 [inline] dst_metric_set include/net/dst.h:194 [inline] icmp6_dst_alloc+0x370/0x490 net/ipv6/route.c:3288 ndisc_send_skb+0x12b1/0x1c50 net/ipv6/ndisc.c:491 ndisc_send_rs+0x129/0x670 net/ipv6/ndisc.c:721 addrconf_rs_timer+0x407/0x840 net/ipv6/addrconf.c:4042 call_timer_fn+0x1a0/0x610 kernel/time/timer.c:1793 expire_timers kernel/time/timer.c:1844 [inline] __run_timers+0x6e8/0x930 kernel/time/timer.c:2418 __run_timer_base kernel/time/timer.c:2430 [inline] __run_timer_base kernel/time/timer.c:2422 [inline] run_timer_base+0x114/0x190 kernel/time/timer.c:2439 page last free pid 6155 tgid 6155 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_page+0x661/0x1080 mm/page_alloc.c:2657 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4085 [inline] slab_alloc_node mm/slub.c:4134 [inline] kmem_cache_alloc_noprof+0x121/0x2f0 mm/slub.c:4141 alloc_buffer_head+0x21/0x160 fs/buffer.c:3015 folio_alloc_buffers+0x2bd/0x830 fs/buffer.c:924 create_empty_buffers+0x36/0x480 fs/buffer.c:1662 folio_create_buffers+0x109/0x150 fs/buffer.c:1773 __block_write_begin_int+0x321/0x16e0 fs/buffer.c:2097 block_page_mkwrite+0x3d9/0x4c0 fs/buffer.c:2629 ext4_page_mkwrite+0x8e2/0x1760 fs/ext4/inode.c:6180 do_page_mkwrite+0x177/0x380 mm/memory.c:3176 do_shared_fault mm/memory.c:5398 [inline] do_fault mm/memory.c:5460 [inline] do_pte_missing+0x29e/0x3e00 mm/memory.c:3979 handle_pte_fault mm/memory.c:5801 [inline] __handle_mm_fault+0x103c/0x2a40 mm/memory.c:5944 handle_mm_fault+0x3fa/0xaa0 mm/memory.c:6112 Memory state around the buggy address: ffff88802ab7fc00: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ffff88802ab7fc80: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc >ffff88802ab7fd00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff88802ab7fd80: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ffff88802ab7fe00: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ==================================================================