================================================================== BUG: KASAN: slab-use-after-free in mgmt_remove_adv_monitor_sync+0x3a/0xd0 net/bluetooth/mgmt.c:5444 Read of size 8 at addr ffff88807c889818 by task kworker/u9:8/5120 CPU: 1 PID: 5120 Comm: kworker/u9:8 Not tainted 6.10.0-syzkaller-09703-gd7e78951a8b8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Workqueue: hci0 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 mgmt_remove_adv_monitor_sync+0x3a/0xd0 net/bluetooth/mgmt.c:5444 hci_cmd_sync_work+0x22b/0x400 net/bluetooth/hci_sync.c:328 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd40 kernel/workqueue.c:3390 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 7765: 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_cache_noprof+0x19c/0x2c0 mm/slub.c:4180 kmalloc_noprof include/linux/slab.h:681 [inline] kzalloc_noprof include/linux/slab.h:807 [inline] mgmt_pending_new+0x65/0x250 net/bluetooth/mgmt_util.c:269 mgmt_pending_add+0x36/0x120 net/bluetooth/mgmt_util.c:296 remove_adv_monitor+0x102/0x1b0 net/bluetooth/mgmt.c:5469 hci_mgmt_cmd+0xc47/0x11d0 net/bluetooth/hci_sock.c:1712 hci_sock_sendmsg+0x7b8/0x11c0 net/bluetooth/hci_sock.c:1832 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 sock_write_iter+0x2dd/0x400 net/socket.c:1160 new_sync_write fs/read_write.c:497 [inline] vfs_write+0xa72/0xc90 fs/read_write.c:590 ksys_write+0x1a0/0x2c0 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 7027: 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:579 poison_slab_object+0xe0/0x150 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:2235 [inline] slab_free mm/slub.c:4464 [inline] kfree+0x149/0x360 mm/slub.c:4585 mgmt_pending_foreach+0xd1/0x130 net/bluetooth/mgmt_util.c:259 __mgmt_power_off+0x187/0x420 net/bluetooth/mgmt.c:9458 hci_dev_close_sync+0x665/0x11a0 net/bluetooth/hci_sync.c:5118 hci_dev_do_close net/bluetooth/hci_core.c:490 [inline] hci_dev_close+0x112/0x210 net/bluetooth/hci_core.c:515 sock_do_ioctl+0x158/0x460 net/socket.c:1222 sock_ioctl+0x629/0x8e0 net/socket.c:1341 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88807c889800 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 24 bytes inside of freed 96-byte region [ffff88807c889800, ffff88807c889860) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7c889 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffefff(slab) raw: 00fff00000000000 ffff888015041280 ffffea0000b42140 dead000000000004 raw: 0000000000000000 0000000000200020 00000001ffffefff 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 0x352800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL|__GFP_THISNODE), pid 5212, tgid 5212 (syz-executor), ts 82836469277, free_ts 82784625274 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1473 prep_new_page mm/page_alloc.c:1481 [inline] get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3425 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4683 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2304 allocate_slab+0x5a/0x2f0 mm/slub.c:2467 new_slab mm/slub.c:2520 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3706 __slab_alloc+0x58/0xa0 mm/slub.c:3796 __slab_alloc_node mm/slub.c:3849 [inline] slab_alloc_node mm/slub.c:4016 [inline] __do_kmalloc_node mm/slub.c:4148 [inline] __kmalloc_node_noprof+0x286/0x440 mm/slub.c:4155 kmalloc_array_node_noprof include/linux/slab.h:788 [inline] alloc_slab_obj_exts+0x3a/0xa0 mm/slub.c:1959 __memcg_slab_post_alloc_hook+0x31c/0x7e0 mm/memcontrol.c:3773 memcg_slab_post_alloc_hook mm/slub.c:2143 [inline] slab_post_alloc_hook mm/slub.c:3989 [inline] slab_alloc_node mm/slub.c:4028 [inline] kmem_cache_alloc_lru_noprof+0x1e6/0x2b0 mm/slub.c:4047 proc_alloc_inode+0x2a/0xc0 fs/proc/inode.c:57 alloc_inode fs/inode.c:263 [inline] new_inode_pseudo fs/inode.c:1028 [inline] new_inode+0x6e/0x310 fs/inode.c:1047 proc_pid_make_inode+0x1f/0x130 fs/proc/base.c:1892 proc_pid_make_base_inode fs/proc/base.c:1943 [inline] proc_pid_instantiate+0x54/0x2b0 fs/proc/base.c:3427 proc_pid_lookup+0x31f/0x470 fs/proc/base.c:3471 page last free pid 5100 tgid 5100 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1093 [inline] free_unref_page+0xd22/0xea0 mm/page_alloc.c:2588 discard_slab mm/slub.c:2566 [inline] __put_partials+0xeb/0x130 mm/slub.c:3034 put_cpu_partial+0x17c/0x250 mm/slub.c:3109 __slab_free+0x2ea/0x3d0 mm/slub.c:4334 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9e/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:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3979 [inline] slab_alloc_node mm/slub.c:4028 [inline] __do_kmalloc_node mm/slub.c:4148 [inline] __kmalloc_noprof+0x1a6/0x400 mm/slub.c:4161 kmalloc_noprof include/linux/slab.h:685 [inline] tomoyo_realpath_from_path+0xcf/0x5e0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path2_perm+0x3eb/0xbb0 security/tomoyo/file.c:923 security_sb_pivotroot+0x6d/0xa0 security/security.c:1489 __do_sys_pivot_root fs/namespace.c:4322 [inline] __se_sys_pivot_root+0x205/0x1650 fs/namespace.c:4301 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88807c889700: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ffff88807c889780: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff88807c889800: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff88807c889880: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffff88807c889900: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================