==================================================================
BUG: KASAN: slab-use-after-free in __list_del_entry_valid_or_report+0x1d4/0x200 lib/list_debug.c:62
Read of size 8 at addr ffff88806973c550 by task syz.9.5885/32396
CPU: 1 UID: 0 PID: 32396 Comm: syz.9.5885 Not tainted 6.14.0-rc2-syzkaller-00228-g04f41cbf03ec #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
<TASK>
__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
__list_del_entry_valid_or_report+0x1d4/0x200 lib/list_debug.c:62
__list_del_entry_valid include/linux/list.h:124 [inline]
__list_del_entry include/linux/list.h:215 [inline]
list_del_init include/linux/list.h:287 [inline]
bt_accept_unlink+0x34/0x2e0 net/bluetooth/af_bluetooth.c:256
l2cap_sock_teardown_cb+0x1a3/0x3c0 net/bluetooth/l2cap_sock.c:1600
l2cap_chan_del+0xba/0x8f0 net/bluetooth/l2cap_core.c:654
l2cap_conn_del+0x37f/0x730 net/bluetooth/l2cap_core.c:1785
hci_disconn_cfm include/net/bluetooth/hci_core.h:2069 [inline]
hci_conn_hash_flush+0x44a/0x790 net/bluetooth/hci_conn.c:2698
hci_dev_close_sync+0x603/0x11a0 net/bluetooth/hci_sync.c:5197
hci_dev_do_close+0x2e/0x90 net/bluetooth/hci_core.c:482
hci_unregister_dev+0x213/0x620 net/bluetooth/hci_core.c:2677
vhci_release+0x79/0xf0 drivers/bluetooth/hci_vhci.c:664
__fput+0x3ff/0xb70 fs/file_table.c:464
task_work_run+0x14e/0x250 kernel/task_work.c:227
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0xad8/0x2d70 kernel/exit.c:938
do_group_exit+0xd3/0x2a0 kernel/exit.c:1087
get_signal+0x24ed/0x26c0 kernel/signal.c:3036
arch_do_signal_or_restart+0x90/0x7e0 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+0x150/0x2a0 kernel/entry/common.c:218
__do_fast_syscall_32+0x80/0x120 arch/x86/entry/common.c:389
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7f63579
Code: Unable to access opcode bytes at 0xf7f6354f.
RSP: 002b:00000000f508655c EFLAGS: 00000296 ORIG_RAX: 0000000000000003
RAX: 0000000000018ff8 RBX: 0000000000000003 RCX: 0000000080019680
RDX: 0000000000018ff8 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Allocated by task 32572:
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:4294 [inline]
__kmalloc_node_track_caller_noprof+0x222/0x510 mm/slub.c:4313
kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:609
pskb_expand_head+0x243/0x1240 net/core/skbuff.c:2275
netlink_trim+0x22d/0x310 net/netlink/af_netlink.c:1304
netlink_broadcast_filtered+0xc7/0xef0 net/netlink/af_netlink.c:1510
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:2586
rtnl_notify net/core/rtnetlink.c:952 [inline]
rtmsg_ifinfo_send net/core/rtnetlink.c:4386 [inline]
rtmsg_ifinfo_event net/core/rtnetlink.c:4402 [inline]
rtmsg_ifinfo_event net/core/rtnetlink.c:4389 [inline]
rtmsg_ifinfo+0x174/0x1a0 net/core/rtnetlink.c:4408
__dev_notify_flags+0x24e/0x2e0 net/core/dev.c:9207
rtnl_configure_link+0x1b7/0x260 net/core/rtnetlink.c:3562
rtnl_newlink_create net/core/rtnetlink.c:3804 [inline]
__rtnl_newlink net/core/rtnetlink.c:3907 [inline]
rtnl_newlink+0xbc9/0x1d60 net/core/rtnetlink.c:4022
rtnetlink_rcv_msg+0x95b/0xea0 net/core/rtnetlink.c:6912
netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2543
netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]
netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1348
netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1892
sock_sendmsg_nosec net/socket.c:718 [inline]
__sock_sendmsg net/socket.c:733 [inline]
__sys_sendto+0x488/0x4f0 net/socket.c:2187
__do_compat_sys_socketcall+0x5e2/0x700 net/compat.c:475
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 32572:
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:576
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:4609 [inline]
kfree+0x2c4/0x4d0 mm/slub.c:4757
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:1533
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:2586
rtnl_notify net/core/rtnetlink.c:952 [inline]
rtmsg_ifinfo_send net/core/rtnetlink.c:4386 [inline]
rtmsg_ifinfo_event net/core/rtnetlink.c:4402 [inline]
rtmsg_ifinfo_event net/core/rtnetlink.c:4389 [inline]
rtmsg_ifinfo+0x174/0x1a0 net/core/rtnetlink.c:4408
__dev_notify_flags+0x24e/0x2e0 net/core/dev.c:9207
rtnl_configure_link+0x1b7/0x260 net/core/rtnetlink.c:3562
rtnl_newlink_create net/core/rtnetlink.c:3804 [inline]
__rtnl_newlink net/core/rtnetlink.c:3907 [inline]
rtnl_newlink+0xbc9/0x1d60 net/core/rtnetlink.c:4022
rtnetlink_rcv_msg+0x95b/0xea0 net/core/rtnetlink.c:6912
netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2543
netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]
netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1348
netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1892
sock_sendmsg_nosec net/socket.c:718 [inline]
__sock_sendmsg net/socket.c:733 [inline]
__sys_sendto+0x488/0x4f0 net/socket.c:2187
__do_compat_sys_socketcall+0x5e2/0x700 net/compat.c:475
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
The buggy address belongs to the object at ffff88806973c000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1360 bytes inside of
freed 2048-byte region [ffff88806973c000, ffff88806973c800)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888069739000 pfn:0x69738
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x4fff00000000240(workingset|head|node=1|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 04fff00000000240 ffff88801b042f00 ffffea00019db010 ffffea0001a5ac10
raw: ffff888069739000 0000000000080007 00000000f5000000 0000000000000000
head: 04fff00000000240 ffff88801b042f00 ffffea00019db010 ffffea0001a5ac10
head: ffff888069739000 0000000000080007 00000000f5000000 0000000000000000
head: 04fff00000000003 ffffea0001a5ce01 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 5350, tgid 5350 (klogd), ts 47192635592, free_ts 0
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1551
prep_new_page mm/page_alloc.c:1559 [inline]
get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3477
__alloc_frozen_pages_noprof+0x221/0x2470 mm/page_alloc.c:4739
alloc_pages_mpol+0x1fc/0x540 mm/mempolicy.c:2270
alloc_slab_page mm/slub.c:2423 [inline]
allocate_slab mm/slub.c:2587 [inline]
new_slab+0x23d/0x330 mm/slub.c:2640
___slab_alloc+0xc5d/0x1720 mm/slub.c:3826
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3916
__slab_alloc_node mm/slub.c:3991 [inline]
slab_alloc_node mm/slub.c:4152 [inline]
__kmalloc_cache_noprof+0xfa/0x410 mm/slub.c:4320
kmalloc_noprof include/linux/slab.h:901 [inline]
syslog_print+0xf9/0x5d0 kernel/printk/printk.c:1607
do_syslog+0x3e1/0x6c0 kernel/printk/printk.c:1785
__do_sys_syslog kernel/printk/printk.c:1877 [inline]
__se_sys_syslog kernel/printk/printk.c:1875 [inline]
__x64_sys_syslog+0x74/0xb0 kernel/printk/printk.c:1875
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
page_owner free stack trace missing
Memory state around the buggy address:
ffff88806973c400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88806973c480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88806973c500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88806973c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88806973c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================