==================================================================
BUG: KASAN: slab-use-after-free in l2cap_connect_cfm+0x5a0/0xde4 net/bluetooth/l2cap_core.c:7280
Read of size 8 at addr ffff0000ef44c480 by task kworker/u9:1/5989

CPU: 1 UID: 0 PID: 5989 Comm: kworker/u9:1 Tainted: G        W          6.13.0-rc6-syzkaller-g6251d1776bc5 #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: hci4 hci_rx_work
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C)
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x198/0x538 mm/kasan/report.c:489
 kasan_report+0xd8/0x138 mm/kasan/report.c:602
 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381
 l2cap_connect_cfm+0x5a0/0xde4 net/bluetooth/l2cap_core.c:7280
 hci_connect_cfm+0x120/0x1d4 include/net/bluetooth/hci_core.h:2057
 le_conn_complete_evt+0xa24/0xf14 net/bluetooth/hci_event.c:5763
 hci_le_conn_complete_evt+0x114/0x404 net/bluetooth/hci_event.c:5789
 hci_le_meta_evt+0x2a4/0x478 net/bluetooth/hci_event.c:7162
 hci_event_func net/bluetooth/hci_event.c:7470 [inline]
 hci_event_packet+0x890/0x106c net/bluetooth/hci_event.c:7525
 hci_rx_work+0x31c/0xb04 net/bluetooth/hci_core.c:4035
 process_one_work+0x7a8/0x15cc kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x97c/0xeec kernel/workqueue.c:3391
 kthread+0x288/0x310 kernel/kthread.c:389
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862

Allocated by task 5989:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:68
 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:568
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __kmalloc_cache_noprof+0x2cc/0x428 mm/slub.c:4329
 kmalloc_noprof include/linux/slab.h:901 [inline]
 kzalloc_noprof include/linux/slab.h:1037 [inline]
 l2cap_chan_create+0x58/0x6a0 net/bluetooth/l2cap_core.c:449
 l2cap_sock_alloc net/bluetooth/l2cap_sock.c:1888 [inline]
 l2cap_sock_new_connection_cb+0x164/0x29c net/bluetooth/l2cap_sock.c:1470
 l2cap_connect_cfm+0x2fc/0xde4 net/bluetooth/l2cap_core.c:7263
 hci_connect_cfm+0x120/0x1d4 include/net/bluetooth/hci_core.h:2057
 le_conn_complete_evt+0xa24/0xf14 net/bluetooth/hci_event.c:5763
 hci_le_conn_complete_evt+0x114/0x404 net/bluetooth/hci_event.c:5789
 hci_le_meta_evt+0x2a4/0x478 net/bluetooth/hci_event.c:7162
 hci_event_func net/bluetooth/hci_event.c:7470 [inline]
 hci_event_packet+0x890/0x106c net/bluetooth/hci_event.c:7525
 hci_rx_work+0x31c/0xb04 net/bluetooth/hci_core.c:4035
 process_one_work+0x7a8/0x15cc kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x97c/0xeec kernel/workqueue.c:3391
 kthread+0x288/0x310 kernel/kthread.c:389
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862

Freed by task 7582:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:68
 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:582
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x64/0x8c 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+0x180/0x478 mm/slub.c:4761
 l2cap_chan_destroy net/bluetooth/l2cap_core.c:495 [inline]
 kref_put include/linux/kref.h:65 [inline]
 l2cap_chan_put+0x174/0x254 net/bluetooth/l2cap_core.c:519
 l2cap_sock_cleanup_listen+0x108/0x290 net/bluetooth/l2cap_sock.c:1453
 l2cap_sock_release+0x5c/0x1b4 net/bluetooth/l2cap_sock.c:1413
 __sock_release net/socket.c:640 [inline]
 sock_close+0xa4/0x1e8 net/socket.c:1408
 __fput+0x1bc/0x75c fs/file_table.c:450
 ____fput+0x20/0x30 fs/file_table.c:478
 task_work_run+0x230/0x2e0 kernel/task_work.c:239
 get_signal+0x1358/0x1534 kernel/signal.c:2790
 do_signal+0x22c/0x39e4 arch/arm64/kernel/signal.c:1658
 do_notify_resume+0x74/0x1f4 arch/arm64/kernel/entry-common.c:148
 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline]
 el0_svc+0xac/0x168 arch/arm64/kernel/entry-common.c:745
 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600

The buggy address belongs to the object at ffff0000ef44c000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1152 bytes inside of
 freed 2048-byte region [ffff0000ef44c000, ffff0000ef44c800)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12f448
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 05ffc00000000040 ffff0000c0002000 0000000000000000 dead000000000001
raw: 0000000000000000 0000000080080008 00000001f5000000 0000000000000000
head: 05ffc00000000040 ffff0000c0002000 0000000000000000 dead000000000001
head: 0000000000000000 0000000080080008 00000001f5000000 0000000000000000
head: 05ffc00000000003 fffffdffc3bd1201 ffffffffffffffff 0000000000000000
head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000ef44c380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000ef44c400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff0000ef44c480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff0000ef44c500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000ef44c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
Unable to handle kernel paging request at virtual address fbd51fffffffff91
KASAN: maybe wild-memory-access in range [0xdeacfffffffffc88-0xdeacfffffffffc8f]
Mem abort info:
  ESR = 0x0000000096000004
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x04: level 0 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000
  CM = 0, WnR = 0, TnD = 0, TagAccess = 0
  GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[fbd51fffffffff91] address between user and kernel address ranges
Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 UID: 0 PID: 5989 Comm: kworker/u9:1 Tainted: G    B   W          6.13.0-rc6-syzkaller-g6251d1776bc5 #0
Tainted: [B]=BAD_PAGE, [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: hci4 hci_rx_work
pstate: 20400005 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline]
pc : atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline]
pc : l2cap_chan_lock include/net/bluetooth/l2cap.h:827 [inline]
pc : l2cap_conn_ready net/bluetooth/l2cap_core.c:1621 [inline]
pc : l2cap_connect_cfm+0x53c/0xde4 net/bluetooth/l2cap_core.c:7280
lr : instrument_atomic_read include/linux/instrumented.h:68 [inline]
lr : atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
lr : l2cap_chan_lock include/net/bluetooth/l2cap.h:827 [inline]
lr : l2cap_conn_ready net/bluetooth/l2cap_core.c:1621 [inline]
lr : l2cap_connect_cfm+0x538/0xde4 net/bluetooth/l2cap_core.c:7280
sp : ffff8000a4d774e0
x29: ffff8000a4d77580 x28: ffff0000ef44c000 x27: 1fffe0001e0a3e03
x26: dfff800000000000 x25: ffff0000ef44c4b0 x24: ffff0000f051f01a
x23: dead000000000100 x22: ffff0000f051f2c0 x21: 1fffe0001a341807
x20: ffff0000d1a0c03d x19: deacfffffffffc8c x18: 1fffe00036700e7e
x17: ffff80008f99d000 x16: ffff800080bf1528 x15: 0000000000000001
x14: 1ffff000125d76f0 x13: 0000000000000000 x12: 0000000000000000
x11: 0000000000100000 x10: fffffffffffffff8 x9 : ffff800097545400
x8 : 1bd59fffffffff91 x7 : 1fffe00036700e7f x6 : ffff8000803d02d8
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008a88b11c
x2 : 0000000000000000 x1 : 0000000000000004 x0 : 0000000000000001
Call trace:
 raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline] (P)
 atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline] (P)
 l2cap_chan_lock include/net/bluetooth/l2cap.h:827 [inline] (P)
 l2cap_conn_ready net/bluetooth/l2cap_core.c:1621 [inline] (P)
 l2cap_connect_cfm+0x53c/0xde4 net/bluetooth/l2cap_core.c:7280 (P)
 hci_connect_cfm+0x120/0x1d4 include/net/bluetooth/hci_core.h:2057
 le_conn_complete_evt+0xa24/0xf14 net/bluetooth/hci_event.c:5763
 hci_le_conn_complete_evt+0x114/0x404 net/bluetooth/hci_event.c:5789
 hci_le_meta_evt+0x2a4/0x478 net/bluetooth/hci_event.c:7162
 hci_event_func net/bluetooth/hci_event.c:7470 [inline]
 hci_event_packet+0x890/0x106c net/bluetooth/hci_event.c:7525
 hci_rx_work+0x31c/0xb04 net/bluetooth/hci_core.c:4035
 process_one_work+0x7a8/0x15cc kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x97c/0xeec kernel/workqueue.c:3391
 kthread+0x288/0x310 kernel/kthread.c:389
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862
Code: 52800081 aa1303e0 975a6ce4 d343fe68 (38fa6908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	52800081 	mov	w1, #0x4                   	// #4
   4:	aa1303e0 	mov	x0, x19
   8:	975a6ce4 	bl	0xfffffffffd69b398
   c:	d343fe68 	lsr	x8, x19, #3
* 10:	38fa6908 	ldrsb	w8, [x8, x26] <-- trapping instruction