================================================================== BUG: KASAN: slab-use-after-free in hci_chan_del+0x3b/0x1b0 net/bluetooth/hci_conn.c:2853 Read of size 8 at addr ffff88805fa77218 by task khidpd_15be5886/10246 CPU: 1 UID: 0 PID: 10246 Comm: khidpd_15be5886 Not tainted 6.14.0-rc1-next-20250206-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+0x241/0x360 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+0x3b/0x1b0 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+0x70/0xe0 net/bluetooth/l2cap_core.c:1830 session_free net/bluetooth/hidp/core.c:989 [inline] kref_put include/linux/kref.h:65 [inline] hidp_session_put+0x1e7/0x220 net/bluetooth/hidp/core.c:996 hidp_session_thread+0x458/0x490 net/bluetooth/hidp/core.c:1305 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 54: 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+0x243/0x390 mm/slub.c:4339 kmalloc_noprof include/linux/slab.h:902 [inline] kzalloc_noprof include/linux/slab.h:1038 [inline] hci_chan_create+0xc8/0x310 net/bluetooth/hci_conn.c:2838 l2cap_conn_add+0x69/0x8e0 net/bluetooth/l2cap_core.c:6864 l2cap_connect_cfm+0x115/0x1090 net/bluetooth/l2cap_core.c:7247 hci_connect_cfm include/net/bluetooth/hci_core.h:2051 [inline] hci_remote_features_evt+0x68e/0xac0 net/bluetooth/hci_event.c:3726 hci_event_func net/bluetooth/hci_event.c:7473 [inline] hci_event_packet+0xac2/0x1540 net/bluetooth/hci_event.c:7525 hci_rx_work+0x3f3/0xdb0 net/bluetooth/hci_core.c:4015 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317 worker_thread+0x870/0xd30 kernel/workqueue.c:3398 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Freed by task 10274: 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:576 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:2367 [inline] slab_free mm/slub.c:4623 [inline] kfree+0x196/0x430 mm/slub.c:4816 hci_chan_list_flush net/bluetooth/hci_conn.c:2878 [inline] hci_conn_cleanup net/bluetooth/hci_conn.c:149 [inline] hci_conn_del+0x4b5/0xc40 net/bluetooth/hci_conn.c:1164 hci_conn_failed+0x319/0x400 net/bluetooth/hci_conn.c:1267 hci_abort_conn_sync+0x56c/0x11f0 net/bluetooth/hci_sync.c:5588 hci_disconnect_all_sync+0x264/0x460 net/bluetooth/hci_sync.c:5611 hci_suspend_sync+0x41a/0xca0 net/bluetooth/hci_sync.c:6088 hci_suspend_dev+0x203/0x3e0 net/bluetooth/hci_core.c:2811 hci_suspend_notifier+0xf2/0x2b0 net/bluetooth/hci_core.c:2391 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85 notifier_call_chain_robust kernel/notifier.c:120 [inline] blocking_notifier_call_chain_robust+0xe8/0x1e0 kernel/notifier.c:345 pm_notifier_call_chain_robust+0x2c/0x60 kernel/power/main.c:102 snapshot_open+0x19b/0x280 kernel/power/user.c:77 misc_open+0x2cc/0x340 drivers/char/misc.c:179 chrdev_open+0x521/0x600 fs/char_dev.c:414 do_dentry_open+0xdec/0x1960 fs/open.c:956 vfs_open+0x3b/0x370 fs/open.c:1086 do_open fs/namei.c:3830 [inline] path_openat+0x2c81/0x3590 fs/namei.c:3989 do_filp_open+0x27f/0x4e0 fs/namei.c:4016 do_sys_openat2+0x13d/0x1c0 fs/open.c:1428 do_sys_open fs/open.c:1443 [inline] __do_sys_openat fs/open.c:1459 [inline] __se_sys_openat fs/open.c:1454 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1454 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 ffff88805fa77200 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 24 bytes inside of freed 128-byte region [ffff88805fa77200, ffff88805fa77280) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5fa77 anon flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801ac41a00 ffffea0001806b40 dead000000000005 raw: 0000000000000000 0000000000100010 00000000f5000000 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 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 5841, tgid 5841 (syz-executor), ts 250919085331, free_ts 250918971085 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1629 prep_new_page mm/page_alloc.c:1637 [inline] get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3555 __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4817 alloc_slab_page mm/slub.c:2439 [inline] allocate_slab+0x66/0x3a0 mm/slub.c:2601 new_slab mm/slub.c:2654 [inline] ___slab_alloc+0xc27/0x14a0 mm/slub.c:3840 __slab_alloc+0x58/0xa0 mm/slub.c:3930 __slab_alloc_node mm/slub.c:4005 [inline] slab_alloc_node mm/slub.c:4166 [inline] __do_kmalloc_node mm/slub.c:4307 [inline] __kmalloc_node_noprof+0x2ee/0x4d0 mm/slub.c:4314 kmalloc_array_node_noprof include/linux/slab.h:1019 [inline] alloc_slab_obj_exts+0x3a/0xa0 mm/slub.c:1965 __memcg_slab_post_alloc_hook+0x319/0x7e0 mm/memcontrol.c:3016 memcg_slab_post_alloc_hook mm/slub.c:2166 [inline] slab_post_alloc_hook mm/slub.c:4139 [inline] slab_alloc_node mm/slub.c:4178 [inline] __do_kmalloc_node mm/slub.c:4307 [inline] __kmalloc_node_noprof+0x30d/0x4d0 mm/slub.c:4314 __kvmalloc_node_noprof+0x72/0x190 mm/util.c:662 xt_alloc_table_info+0x3d/0xa0 net/netfilter/x_tables.c:1193 do_replace net/ipv6/netfilter/ip6_tables.c:1143 [inline] do_ip6t_set_ctl+0xba0/0x1270 net/ipv6/netfilter/ip6_tables.c:1644 nf_setsockopt+0x295/0x2c0 net/netfilter/nf_sockopt.c:101 do_sock_setsockopt+0x3af/0x720 net/socket.c:2303 __sys_setsockopt net/socket.c:2328 [inline] __do_sys_setsockopt net/socket.c:2334 [inline] __se_sys_setsockopt net/socket.c:2331 [inline] __x64_sys_setsockopt+0x1ee/0x280 net/socket.c:2331 page last free pid 5841 tgid 5841 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1205 [inline] free_frozen_pages+0xe0d/0x10e0 mm/page_alloc.c:2738 vfree+0x1c3/0x360 mm/vmalloc.c:3383 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:882 [inline] get_entries net/ipv6/netfilter/ip6_tables.c:1039 [inline] do_ip6t_get_ctl+0x11eb/0x1820 net/ipv6/netfilter/ip6_tables.c:1677 nf_getsockopt+0x299/0x2c0 net/netfilter/nf_sockopt.c:116 ipv6_getsockopt+0x23e/0x360 net/ipv6/ipv6_sockglue.c:1493 tcp_getsockopt+0x163/0x1c0 net/ipv4/tcp.c:4690 do_sock_getsockopt+0x3c4/0x7e0 net/socket.c:2364 __sys_getsockopt net/socket.c:2393 [inline] __do_sys_getsockopt net/socket.c:2400 [inline] __se_sys_getsockopt net/socket.c:2397 [inline] __x64_sys_getsockopt+0x2a1/0x370 net/socket.c:2397 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: ffff88805fa77100: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc ffff88805fa77180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88805fa77200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805fa77280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805fa77300: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc ==================================================================