kobject: kobject_add_internal failed for hci5:201 with -EEXIST, don't try to register things with the same name in the same directory.
Bluetooth: hci5: failed to register connection device
==================================================================
BUG: KASAN: slab-use-after-free in l2cap_sock_new_connection_cb+0x22a/0x240 net/bluetooth/l2cap_sock.c:1484
Read of size 8 at addr ffff888058653580 by task kworker/u9:2/5845
CPU: 1 UID: 0 PID: 5845 Comm: kworker/u9:2 Not tainted 6.14.0-rc4-syzkaller-00073-g5394eea10651 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: hci5 hci_rx_work
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:408 [inline]
print_report+0xc3/0x670 mm/kasan/report.c:521
kasan_report+0xd9/0x110 mm/kasan/report.c:634
l2cap_sock_new_connection_cb+0x22a/0x240 net/bluetooth/l2cap_sock.c:1484
l2cap_connect_cfm+0x862/0xf10 net/bluetooth/l2cap_core.c:7223
hci_connect_cfm include/net/bluetooth/hci_core.h:2051 [inline]
le_conn_complete_evt+0x1690/0x1da0 net/bluetooth/hci_event.c:5763
hci_le_conn_complete_evt+0x23c/0x370 net/bluetooth/hci_event.c:5789
hci_le_meta_evt+0x2e5/0x5d0 net/bluetooth/hci_event.c:7162
hci_event_func net/bluetooth/hci_event.c:7470 [inline]
hci_event_packet+0x669/0x1180 net/bluetooth/hci_event.c:7525
hci_rx_work+0x2c5/0x16b0 net/bluetooth/hci_core.c:4015
process_one_work+0x9c8/0x1ba0 kernel/workqueue.c:3236
process_scheduled_works kernel/workqueue.c:3317 [inline]
worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398
kthread+0x3b2/0x750 kernel/kthread.c:464
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Allocated by task 5845:
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_noprof+0x21c/0x510 mm/slub.c:4306
kmalloc_noprof include/linux/slab.h:905 [inline]
sk_prot_alloc+0x1a8/0x2a0 net/core/sock.c:2181
sk_alloc+0x36/0xb90 net/core/sock.c:2234
bt_sock_alloc+0x3b/0x3a0 net/bluetooth/af_bluetooth.c:148
l2cap_sock_alloc.constprop.0+0x33/0x1d0 net/bluetooth/l2cap_sock.c:1878
l2cap_sock_new_connection_cb+0x101/0x240 net/bluetooth/l2cap_sock.c:1469
l2cap_connect_cfm+0x862/0xf10 net/bluetooth/l2cap_core.c:7223
hci_connect_cfm include/net/bluetooth/hci_core.h:2051 [inline]
le_conn_complete_evt+0x1690/0x1da0 net/bluetooth/hci_event.c:5763
hci_le_conn_complete_evt+0x23c/0x370 net/bluetooth/hci_event.c:5789
hci_le_meta_evt+0x2e5/0x5d0 net/bluetooth/hci_event.c:7162
hci_event_func net/bluetooth/hci_event.c:7470 [inline]
hci_event_packet+0x669/0x1180 net/bluetooth/hci_event.c:7525
hci_rx_work+0x2c5/0x16b0 net/bluetooth/hci_core.c:4015
process_one_work+0x9c8/0x1ba0 kernel/workqueue.c:3236
process_scheduled_works kernel/workqueue.c:3317 [inline]
worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398
kthread+0x3b2/0x750 kernel/kthread.c:464
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Freed by task 6021:
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
sk_prot_free net/core/sock.c:2217 [inline]
__sk_destruct+0x5eb/0x720 net/core/sock.c:2309
sk_destruct+0xc2/0xf0 net/core/sock.c:2324
__sk_free+0xf4/0x3e0 net/core/sock.c:2335
sk_free+0x6a/0x90 net/core/sock.c:2346
sock_put include/net/sock.h:1913 [inline]
l2cap_sock_kill net/bluetooth/l2cap_sock.c:1252 [inline]
l2cap_sock_kill+0x171/0x2d0 net/bluetooth/l2cap_sock.c:1237
l2cap_sock_cleanup_listen+0x3d/0x2a0 net/bluetooth/l2cap_sock.c:1449
l2cap_sock_release+0x5c/0x210 net/bluetooth/l2cap_sock.c:1412
__sock_release+0xb3/0x270 net/socket.c:647
sock_close+0x1c/0x30 net/socket.c:1398
__fput+0x402/0xb70 fs/file_table.c:464
task_work_run+0x151/0x250 kernel/task_work.c:227
get_signal+0x1d3/0x26c0 kernel/signal.c:2809
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_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888058653000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1408 bytes inside of
freed 2048-byte region [ffff888058653000, ffff888058653800)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x58650
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b042000 0000000000000000 0000000000000001
raw: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b042000 0000000000000000 0000000000000001
head: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 00fff00000000003 ffffea0001619401 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 0xd28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 12, tgid 12 (kworker/u8:1), ts 90872432833, free_ts 31905529052
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]
__do_kmalloc_node mm/slub.c:4293 [inline]
__kmalloc_node_track_caller_noprof+0x2f1/0x510 mm/slub.c:4313
kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:537
pskb_expand_head+0x243/0x1240 net/core/skbuff.c:2185
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
netdev_state_change net/core/dev.c:1539 [inline]
netdev_state_change+0x12f/0x150 net/core/dev.c:1530
linkwatch_do_dev+0x12b/0x160 net/core/link_watch.c:186
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+0x6db/0xfb0 mm/page_alloc.c:2660
free_contig_range+0x133/0x3f0 mm/page_alloc.c:6678
destroy_args+0x66f/0x830 mm/debug_vm_pgtable.c:1017
debug_vm_pgtable+0x130f/0x2d60 mm/debug_vm_pgtable.c:1397
do_one_initcall+0x12b/0x700 init/main.c:1257
do_initcall_level init/main.c:1319 [inline]
do_initcalls init/main.c:1335 [inline]
do_basic_setup init/main.c:1354 [inline]
kernel_init_freeable+0x5c7/0x900 init/main.c:1568
kernel_init+0x1c/0x2b0 init/main.c:1457
ret_from_fork+0x48/0x80 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:
ffff888058653480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888058653500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888058653580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888058653600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888058653680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
==================================================================
BUG: KASAN: slab-use-after-free in l2cap_connect_cfm+0x884/0xf10 net/bluetooth/l2cap_core.c:7225
Write of size 6 at addr ffff888058652018 by task kworker/u9:2/5845
CPU: 1 UID: 0 PID: 5845 Comm: kworker/u9:2 Tainted: G B 6.14.0-rc4-syzkaller-00073-g5394eea10651 #0
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: hci5 hci_rx_work
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:408 [inline]
print_report+0xc3/0x670 mm/kasan/report.c:521
kasan_report+0xd9/0x110 mm/kasan/report.c:634
check_region_inline mm/kasan/generic.c:183 [inline]
kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189
__asan_memcpy+0x3c/0x60 mm/kasan/shadow.c:106
l2cap_connect_cfm+0x884/0xf10 net/bluetooth/l2cap_core.c:7225
hci_connect_cfm include/net/bluetooth/hci_core.h:2051 [inline]
le_conn_complete_evt+0x1690/0x1da0 net/bluetooth/hci_event.c:5763
hci_le_conn_complete_evt+0x23c/0x370 net/bluetooth/hci_event.c:5789
hci_le_meta_evt+0x2e5/0x5d0 net/bluetooth/hci_event.c:7162
hci_event_func net/bluetooth/hci_event.c:7470 [inline]
hci_event_packet+0x669/0x1180 net/bluetooth/hci_event.c:7525
hci_rx_work+0x2c5/0x16b0 net/bluetooth/hci_core.c:4015
process_one_work+0x9c8/0x1ba0 kernel/workqueue.c:3236
process_scheduled_works kernel/workqueue.c:3317 [inline]
worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398
kthread+0x3b2/0x750 kernel/kthread.c:464
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Allocated by task 5845:
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
kmalloc_noprof include/linux/slab.h:901 [inline]
kzalloc_noprof include/linux/slab.h:1037 [inline]
l2cap_chan_create+0x44/0x920 net/bluetooth/l2cap_core.c:445
l2cap_sock_alloc.constprop.0+0xf5/0x1d0 net/bluetooth/l2cap_sock.c:1887
l2cap_sock_new_connection_cb+0x101/0x240 net/bluetooth/l2cap_sock.c:1469
l2cap_connect_cfm+0x862/0xf10 net/bluetooth/l2cap_core.c:7223
hci_connect_cfm include/net/bluetooth/hci_core.h:2051 [inline]
le_conn_complete_evt+0x1690/0x1da0 net/bluetooth/hci_event.c:5763
hci_le_conn_complete_evt+0x23c/0x370 net/bluetooth/hci_event.c:5789
hci_le_meta_evt+0x2e5/0x5d0 net/bluetooth/hci_event.c:7162
hci_event_func net/bluetooth/hci_event.c:7470 [inline]
hci_event_packet+0x669/0x1180 net/bluetooth/hci_event.c:7525
hci_rx_work+0x2c5/0x16b0 net/bluetooth/hci_core.c:4015
process_one_work+0x9c8/0x1ba0 kernel/workqueue.c:3236
process_scheduled_works kernel/workqueue.c:3317 [inline]
worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398
kthread+0x3b2/0x750 kernel/kthread.c:464
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Freed by task 6021:
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
l2cap_chan_destroy net/bluetooth/l2cap_core.c:491 [inline]
kref_put include/linux/kref.h:65 [inline]
l2cap_chan_put+0x216/0x2c0 net/bluetooth/l2cap_core.c:515
l2cap_sock_cleanup_listen+0x4d/0x2a0 net/bluetooth/l2cap_sock.c:1452
l2cap_sock_release+0x5c/0x210 net/bluetooth/l2cap_sock.c:1412
__sock_release+0xb3/0x270 net/socket.c:647
sock_close+0x1c/0x30 net/socket.c:1398
__fput+0x402/0xb70 fs/file_table.c:464
task_work_run+0x151/0x250 kernel/task_work.c:227
get_signal+0x1d3/0x26c0 kernel/signal.c:2809
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_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888058652000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 24 bytes inside of
freed 2048-byte region [ffff888058652000, ffff888058652800)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x58650
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b042000 0000000000000000 0000000000000001
raw: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b042000 0000000000000000 0000000000000001
head: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 00fff00000000003 ffffea0001619401 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 0xd28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 12, tgid 12 (kworker/u8:1), ts 90872432833, free_ts 31905529052
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]
__do_kmalloc_node mm/slub.c:4293 [inline]
__kmalloc_node_track_caller_noprof+0x2f1/0x510 mm/slub.c:4313
kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:537
pskb_expand_head+0x243/0x1240 net/core/skbuff.c:2185
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
netdev_state_change net/core/dev.c:1539 [inline]
netdev_state_change+0x12f/0x150 net/core/dev.c:1530
linkwatch_do_dev+0x12b/0x160 net/core/link_watch.c:186
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+0x6db/0xfb0 mm/page_alloc.c:2660
free_contig_range+0x133/0x3f0 mm/page_alloc.c:6678
destroy_args+0x66f/0x830 mm/debug_vm_pgtable.c:1017
debug_vm_pgtable+0x130f/0x2d60 mm/debug_vm_pgtable.c:1397
do_one_initcall+0x12b/0x700 init/main.c:1257
do_initcall_level init/main.c:1319 [inline]
do_initcalls init/main.c:1335 [inline]
do_basic_setup init/main.c:1354 [inline]
kernel_init_freeable+0x5c7/0x900 init/main.c:1568
kernel_init+0x1c/0x2b0 init/main.c:1457
ret_from_fork+0x48/0x80 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:
ffff888058651f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888058651f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888058652000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888058652080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888058652100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================