================================================================== BUG: KASAN: slab-use-after-free in force_wakeup_write+0x14d/0x170 drivers/bluetooth/hci_vhci.c:188 Read of size 1 at addr ffff88805f5dca31 by task syz.7.2212/14344 CPU: 1 UID: 0 PID: 14344 Comm: syz.7.2212 Not tainted 6.13.0-rc4-syzkaller-00071-gfd0584d220fe #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 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 force_wakeup_write+0x14d/0x170 drivers/bluetooth/hci_vhci.c:188 full_proxy_write+0xfb/0x1b0 fs/debugfs/file.c:356 vfs_write+0x24c/0x1150 fs/read_write.c:677 ksys_write+0x12b/0x250 fs/read_write.c:731 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 RIP: 0033:0x7f1d1fd85d29 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:00007f1d20b09038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f1d1ff75fa0 RCX: 00007f1d1fd85d29 RDX: 0000000000000001 RSI: 0000000020001780 RDI: 0000000000000003 RBP: 00007f1d1fe01b08 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f1d1ff75fa0 R15: 00007fff9bfac9d8 Allocated by task 14237: 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:260 [inline] __do_kmalloc_node mm/slub.c:4298 [inline] __kmalloc_node_track_caller_noprof+0x21d/0x520 mm/slub.c:4317 kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:609 __alloc_skb+0x164/0x380 net/core/skbuff.c:678 alloc_skb include/linux/skbuff.h:1323 [inline] nlmsg_new include/net/netlink.h:1018 [inline] inet6_rt_notify+0xc7/0x260 net/ipv6/route.c:6195 fib6_del_route net/ipv6/ip6_fib.c:2005 [inline] fib6_del+0xf56/0x1760 net/ipv6/ip6_fib.c:2040 fib6_clean_node+0x426/0x5b0 net/ipv6/ip6_fib.c:2202 fib6_walk_continue+0x44f/0x8d0 net/ipv6/ip6_fib.c:2124 fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2172 fib6_clean_tree+0xd7/0x120 net/ipv6/ip6_fib.c:2252 __fib6_clean_all+0x100/0x2d0 net/ipv6/ip6_fib.c:2268 rt6_sync_down_dev net/ipv6/route.c:4908 [inline] rt6_disable_ip+0x2ef/0x940 net/ipv6/route.c:4913 addrconf_ifdown.isra.0+0x126/0x1a20 net/ipv6/addrconf.c:3877 addrconf_notify+0x220/0x19c0 net/ipv6/addrconf.c:3800 notifier_call_chain+0xb7/0x410 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1996 call_netdevice_notifiers_extack net/core/dev.c:2034 [inline] call_netdevice_notifiers net/core/dev.c:2048 [inline] dev_close_many+0x333/0x6a0 net/core/dev.c:1589 unregister_netdevice_many_notify+0x489/0x1e60 net/core/dev.c:11500 rtnl_delete_link net/core/rtnetlink.c:3476 [inline] rtnl_dellink+0x3d7/0xaa0 net/core/rtnetlink.c:3518 rtnetlink_rcv_msg+0x95b/0xea0 net/core/rtnetlink.c:6922 netlink_rcv_skb+0x165/0x410 net/netlink/af_netlink.c:2542 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline] netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1347 netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1891 sock_sendmsg_nosec net/socket.c:711 [inline] __sock_sendmsg net/socket.c:726 [inline] ____sys_sendmsg+0x9ae/0xb40 net/socket.c:2583 ___sys_sendmsg+0x135/0x1e0 net/socket.c:2637 __sys_sendmsg+0x16e/0x220 net/socket.c:2669 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 14237: 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:582 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:2353 [inline] slab_free mm/slub.c:4613 [inline] kfree+0x14f/0x4b0 mm/slub.c:4761 skb_kfree_head net/core/skbuff.c:1086 [inline] skb_free_head+0x108/0x1d0 net/core/skbuff.c:1098 skb_release_data+0x560/0x730 net/core/skbuff.c:1125 skb_release_all net/core/skbuff.c:1190 [inline] __kfree_skb net/core/skbuff.c:1204 [inline] consume_skb net/core/skbuff.c:1436 [inline] consume_skb+0xbf/0x100 net/core/skbuff.c:1430 netlink_broadcast_filtered+0x3d5/0xef0 net/netlink/af_netlink.c:1532 nlmsg_multicast_filtered include/net/netlink.h:1128 [inline] nlmsg_multicast include/net/netlink.h:1147 [inline] nlmsg_notify+0x9e/0x220 net/netlink/af_netlink.c:2585 inet6_rt_notify+0x19b/0x260 net/ipv6/route.c:6207 fib6_del_route net/ipv6/ip6_fib.c:2005 [inline] fib6_del+0xf56/0x1760 net/ipv6/ip6_fib.c:2040 fib6_clean_node+0x426/0x5b0 net/ipv6/ip6_fib.c:2202 fib6_walk_continue+0x44f/0x8d0 net/ipv6/ip6_fib.c:2124 fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2172 fib6_clean_tree+0xd7/0x120 net/ipv6/ip6_fib.c:2252 __fib6_clean_all+0x100/0x2d0 net/ipv6/ip6_fib.c:2268 rt6_sync_down_dev net/ipv6/route.c:4908 [inline] rt6_disable_ip+0x2ef/0x940 net/ipv6/route.c:4913 addrconf_ifdown.isra.0+0x126/0x1a20 net/ipv6/addrconf.c:3877 addrconf_notify+0x220/0x19c0 net/ipv6/addrconf.c:3800 notifier_call_chain+0xb7/0x410 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1996 call_netdevice_notifiers_extack net/core/dev.c:2034 [inline] call_netdevice_notifiers net/core/dev.c:2048 [inline] dev_close_many+0x333/0x6a0 net/core/dev.c:1589 unregister_netdevice_many_notify+0x489/0x1e60 net/core/dev.c:11500 rtnl_delete_link net/core/rtnetlink.c:3476 [inline] rtnl_dellink+0x3d7/0xaa0 net/core/rtnetlink.c:3518 rtnetlink_rcv_msg+0x95b/0xea0 net/core/rtnetlink.c:6922 netlink_rcv_skb+0x165/0x410 net/netlink/af_netlink.c:2542 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline] netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1347 netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1891 sock_sendmsg_nosec net/socket.c:711 [inline] __sock_sendmsg net/socket.c:726 [inline] ____sys_sendmsg+0x9ae/0xb40 net/socket.c:2583 ___sys_sendmsg+0x135/0x1e0 net/socket.c:2637 __sys_sendmsg+0x16e/0x220 net/socket.c:2669 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 The buggy address belongs to the object at ffff88805f5dc800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 561 bytes inside of freed 1024-byte region [ffff88805f5dc800, ffff88805f5dcc00) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88805f5dd800 pfn:0x5f5d8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff88801ac41dc0 ffffea00013f7c10 ffffea00009e2a10 raw: ffff88805f5dd800 000000000010000f 00000001f5000000 0000000000000000 head: 00fff00000000240 ffff88801ac41dc0 ffffea00013f7c10 ffffea00009e2a10 head: ffff88805f5dd800 000000000010000f 00000001f5000000 0000000000000000 head: 00fff00000000003 ffffea00017d7601 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 5838, tgid 5838 (syz-executor), ts 93752641614, free_ts 33027031679 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1558 prep_new_page mm/page_alloc.c:1566 [inline] get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3476 __alloc_pages_noprof+0x223/0x25b0 mm/page_alloc.c:4753 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2269 alloc_slab_page mm/slub.c:2423 [inline] allocate_slab mm/slub.c:2589 [inline] new_slab+0x2c9/0x410 mm/slub.c:2642 ___slab_alloc+0xce2/0x1650 mm/slub.c:3830 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3920 __slab_alloc_node mm/slub.c:3995 [inline] slab_alloc_node mm/slub.c:4156 [inline] __do_kmalloc_node mm/slub.c:4297 [inline] __kmalloc_node_noprof+0x2f0/0x520 mm/slub.c:4304 kmalloc_node_noprof include/linux/slab.h:928 [inline] qdisc_alloc+0xbb/0xc50 net/sched/sch_generic.c:952 qdisc_create_dflt+0x73/0x430 net/sched/sch_generic.c:1014 attach_one_default_qdisc net/sched/sch_generic.c:1180 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2562 [inline] attach_default_qdiscs net/sched/sch_generic.c:1198 [inline] dev_activate+0x63a/0x12b0 net/sched/sch_generic.c:1257 __dev_open+0x396/0x4e0 net/core/dev.c:1485 __dev_change_flags+0x561/0x720 net/core/dev.c:8949 dev_change_flags+0x8f/0x160 net/core/dev.c:9021 do_setlink.constprop.0+0x17b9/0x3f20 net/core/rtnetlink.c:3109 rtnl_changelink net/core/rtnetlink.c:3723 [inline] __rtnl_newlink net/core/rtnetlink.c:3875 [inline] rtnl_newlink+0x131c/0x1d70 net/core/rtnetlink.c:4012 page last free pid 1 tgid 1 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:2659 free_contig_range+0x133/0x3f0 mm/page_alloc.c:6632 destroy_args+0x802/0xa50 mm/debug_vm_pgtable.c:1017 debug_vm_pgtable+0x16d8/0x3230 mm/debug_vm_pgtable.c:1397 do_one_initcall+0x128/0x630 init/main.c:1266 do_initcall_level init/main.c:1328 [inline] do_initcalls init/main.c:1344 [inline] do_basic_setup init/main.c:1363 [inline] kernel_init_freeable+0x58f/0x8b0 init/main.c:1577 kernel_init+0x1c/0x2b0 init/main.c:1466 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff88805f5dc900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805f5dc980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805f5dca00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805f5dca80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805f5dcb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================