================================================================== BUG: KASAN: slab-use-after-free in sco_conn_free net/bluetooth/sco.c:87 [inline] BUG: KASAN: slab-use-after-free in kref_put include/linux/kref.h:65 [inline] BUG: KASAN: slab-use-after-free in sco_conn_put+0xad/0x210 net/bluetooth/sco.c:107 Write of size 8 at addr ffff88805d0c85a0 by task syz.2.2152/14174 CPU: 1 UID: 0 PID: 14174 Comm: syz.2.2152 Not tainted 6.14.0-rc3-syzkaller-00703-ge13b6da7045f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 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:408 [inline] print_report+0x16e/0x5b0 mm/kasan/report.c:521 kasan_report+0x143/0x180 mm/kasan/report.c:634 sco_conn_free net/bluetooth/sco.c:87 [inline] kref_put include/linux/kref.h:65 [inline] sco_conn_put+0xad/0x210 net/bluetooth/sco.c:107 hci_disconn_cfm include/net/bluetooth/hci_core.h:2069 [inline] hci_conn_hash_flush+0x1be/0x350 net/bluetooth/hci_conn.c:2698 hci_dev_close_sync+0xa8b/0x1260 net/bluetooth/hci_sync.c:5197 hci_dev_do_close net/bluetooth/hci_core.c:482 [inline] hci_unregister_dev+0x20b/0x510 net/bluetooth/hci_core.c:2677 vhci_release+0x80/0xd0 drivers/bluetooth/hci_vhci.c:664 __fput+0x3e9/0x9f0 fs/file_table.c:464 task_work_run+0x24f/0x310 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xa2a/0x28e0 kernel/exit.c:938 do_group_exit+0x207/0x2c0 kernel/exit.c:1087 get_signal+0x168c/0x1720 kernel/signal.c:3036 arch_do_signal_or_restart+0x96/0x860 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+0xce/0x340 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7efd319b58a0 Code: Unable to access opcode bytes at 0x7efd319b5876. RSP: 002b:00007ffec82ce938 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 00007efd2fff76c0 RCX: 00007efd3198d1a3 RDX: 00007ffec82ce940 RSI: 00007ffec82cea70 RDI: 0000000000000021 RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000 R10: 0000000000020022 R11: 0000000000000246 R12: 00007ffec82cf020 R13: ffffffffffffffc0 R14: 0000000000001000 R15: 0000000000000000 Allocated by task 13635: 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] __do_kmalloc_node mm/slub.c:4294 [inline] __kmalloc_node_track_caller_noprof+0x28b/0x4c0 mm/slub.c:4313 kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:537 pskb_expand_head+0x1ee/0x1440 net/core/skbuff.c:2185 netlink_trim+0x1d6/0x2e0 net/netlink/af_netlink.c:1305 netlink_broadcast_filtered+0x76/0x12a0 net/netlink/af_netlink.c:1511 nlmsg_multicast_filtered include/net/netlink.h:1129 [inline] nlmsg_multicast include/net/netlink.h:1148 [inline] nlmsg_notify+0xfb/0x1c0 net/netlink/af_netlink.c:2587 rtnl_notify net/core/rtnetlink.c:957 [inline] rtmsg_ifinfo_send net/core/rtnetlink.c:4393 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:4409 [inline] rtnetlink_event+0x21d/0x260 net/core/rtnetlink.c:6979 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2251 [inline] call_netdevice_notifiers net/core/dev.c:2265 [inline] dev_set_mac_address+0x3d9/0x510 net/core/dev.c:9532 dev_set_mac_address_user+0x31/0x50 net/core/dev.c:9546 do_setlink+0x784/0x4300 net/core/rtnetlink.c:3078 rtnl_changelink net/core/rtnetlink.c:3738 [inline] __rtnl_newlink net/core/rtnetlink.c:3892 [inline] rtnl_newlink+0x15af/0x1da0 net/core/rtnetlink.c:4029 rtnetlink_rcv_msg+0x791/0xcf0 net/core/rtnetlink.c:6919 netlink_rcv_skb+0x206/0x480 net/netlink/af_netlink.c:2544 netlink_unicast_kernel net/netlink/af_netlink.c:1323 [inline] netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1349 netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1893 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:733 __sys_sendto+0x363/0x4c0 net/socket.c:2187 __do_sys_sendto net/socket.c:2194 [inline] __se_sys_sendto net/socket.c:2190 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2190 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 13635: 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:2353 [inline] slab_free mm/slub.c:4609 [inline] kfree+0x196/0x430 mm/slub.c:4757 skb_kfree_head net/core/skbuff.c:996 [inline] skb_free_head net/core/skbuff.c:1008 [inline] skb_release_data+0x6a0/0x8a0 net/core/skbuff.c:1035 skb_release_all net/core/skbuff.c:1100 [inline] __kfree_skb net/core/skbuff.c:1114 [inline] consume_skb+0x9f/0xf0 net/core/skbuff.c:1346 netlink_broadcast_filtered+0x116d/0x12a0 net/netlink/af_netlink.c:1534 nlmsg_multicast_filtered include/net/netlink.h:1129 [inline] nlmsg_multicast include/net/netlink.h:1148 [inline] nlmsg_notify+0xfb/0x1c0 net/netlink/af_netlink.c:2587 rtnl_notify net/core/rtnetlink.c:957 [inline] rtmsg_ifinfo_send net/core/rtnetlink.c:4393 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:4409 [inline] rtnetlink_event+0x21d/0x260 net/core/rtnetlink.c:6979 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2251 [inline] call_netdevice_notifiers net/core/dev.c:2265 [inline] dev_set_mac_address+0x3d9/0x510 net/core/dev.c:9532 dev_set_mac_address_user+0x31/0x50 net/core/dev.c:9546 do_setlink+0x784/0x4300 net/core/rtnetlink.c:3078 rtnl_changelink net/core/rtnetlink.c:3738 [inline] __rtnl_newlink net/core/rtnetlink.c:3892 [inline] rtnl_newlink+0x15af/0x1da0 net/core/rtnetlink.c:4029 rtnetlink_rcv_msg+0x791/0xcf0 net/core/rtnetlink.c:6919 netlink_rcv_skb+0x206/0x480 net/netlink/af_netlink.c:2544 netlink_unicast_kernel net/netlink/af_netlink.c:1323 [inline] netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1349 netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1893 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:733 __sys_sendto+0x363/0x4c0 net/socket.c:2187 __do_sys_sendto net/socket.c:2194 [inline] __se_sys_sendto net/socket.c:2190 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2190 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 ffff88805d0c8000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1440 bytes inside of freed 2048-byte region [ffff88805d0c8000, ffff88805d0c8800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88805d0ca000 pfn:0x5d0c8 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 ffff88801b042000 ffffea000198e010 ffffea0000966c10 raw: ffff88805d0ca000 0000000000080001 00000000f5000000 0000000000000000 head: 00fff00000000240 ffff88801b042000 ffffea000198e010 ffffea0000966c10 head: ffff88805d0ca000 0000000000080001 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea0001743201 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 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5846, tgid 5846 (syz-executor), ts 59440908427, free_ts 17359426292 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4739 alloc_pages_mpol+0x311/0x660 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:2423 [inline] allocate_slab+0x8f/0x3a0 mm/slub.c:2587 new_slab mm/slub.c:2640 [inline] ___slab_alloc+0xc27/0x14a0 mm/slub.c:3826 __slab_alloc+0x58/0xa0 mm/slub.c:3916 __slab_alloc_node mm/slub.c:3991 [inline] slab_alloc_node mm/slub.c:4152 [inline] __do_kmalloc_node mm/slub.c:4293 [inline] __kmalloc_node_track_caller_noprof+0x2e9/0x4c0 mm/slub.c:4313 kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:537 pskb_expand_head+0x1ee/0x1440 net/core/skbuff.c:2185 netlink_trim+0x1d6/0x2e0 net/netlink/af_netlink.c:1305 netlink_broadcast_filtered+0x76/0x12a0 net/netlink/af_netlink.c:1511 nlmsg_multicast_filtered include/net/netlink.h:1129 [inline] nlmsg_multicast include/net/netlink.h:1148 [inline] nlmsg_notify+0xfb/0x1c0 net/netlink/af_netlink.c:2587 __dev_notify_flags+0xf7/0x400 net/core/dev.c:9304 rtnl_newlink_create+0x601/0xb30 net/core/rtnetlink.c:3810 __rtnl_newlink net/core/rtnetlink.c:3914 [inline] rtnl_newlink+0x1683/0x1da0 net/core/rtnetlink.c:4029 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_frozen_pages+0xe0d/0x10e0 mm/page_alloc.c:2660 free_contig_range+0x14c/0x430 mm/page_alloc.c:6678 destroy_args+0x94/0x4b0 mm/debug_vm_pgtable.c:1017 debug_vm_pgtable+0x551/0x590 mm/debug_vm_pgtable.c:1397 do_one_initcall+0x248/0x930 init/main.c:1257 do_initcall_level+0x157/0x210 init/main.c:1319 do_initcalls+0x71/0xd0 init/main.c:1335 kernel_init_freeable+0x435/0x5d0 init/main.c:1568 kernel_init+0x1d/0x2b0 init/main.c:1457 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff88805d0c8480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805d0c8500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805d0c8580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805d0c8600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805d0c8680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================