==================================================================
BUG: KASAN: use-after-free in __list_del_entry_valid+0x34/0x150 lib/list_debug.c:46
Read of size 8 at addr ffff0000ca486008 by task syz.6.414/6229
CPU: 0 PID: 6229 Comm: syz.6.414 Not tainted 5.15.185-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call trace:
dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
__dump_stack+0x30/0x40 lib/dump_stack.c:88
dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
print_address_description+0x78/0x30c mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0xec/0x15c mm/kasan/report.c:451
__asan_report_load8_noabort+0x44/0x50 mm/kasan/report_generic.c:309
__list_del_entry_valid+0x34/0x150 lib/list_debug.c:46
__list_del_entry include/linux/list.h:132 [inline]
list_del include/linux/list.h:146 [inline]
settings_rsp+0x10c/0x338 net/bluetooth/mgmt.c:1284
mgmt_pending_foreach+0xd4/0x148 net/bluetooth/mgmt_util.c:226
__mgmt_power_off+0xc4/0x2a8 net/bluetooth/mgmt.c:8624
hci_dev_do_close+0x4a0/0x105c net/bluetooth/hci_core.c:1791
hci_dev_close+0xc8/0x1b8 net/bluetooth/hci_core.c:1877
hci_sock_ioctl+0x474/0x94c net/bluetooth/hci_sock.c:1067
sock_do_ioctl+0xf8/0x240 net/socket.c:1140
sock_ioctl+0x5c8/0x87c net/socket.c:1257
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]
__arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Allocated by task 6134:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc mm/kasan/common.c:513 [inline]
__kasan_kmalloc+0xb0/0xf0 mm/kasan/common.c:522
kasan_kmalloc include/linux/kasan.h:264 [inline]
kmem_cache_alloc_trace+0x274/0x3fc mm/slub.c:3247
kmalloc include/linux/slab.h:604 [inline]
kzalloc include/linux/slab.h:735 [inline]
mgmt_pending_add+0x70/0x2fc net/bluetooth/mgmt_util.c:236
set_powered+0x244/0x628 net/bluetooth/mgmt.c:1230
hci_mgmt_cmd+0x718/0xa98 net/bluetooth/hci_sock.c:1652
hci_sock_sendmsg+0x2e8/0x864 net/bluetooth/hci_sock.c:1787
sock_sendmsg_nosec net/socket.c:704 [inline]
__sock_sendmsg net/socket.c:716 [inline]
sock_write_iter+0x23c/0x31c net/socket.c:1079
call_write_iter include/linux/fs.h:2172 [inline]
new_sync_write fs/read_write.c:507 [inline]
vfs_write+0x7c8/0xa2c fs/read_write.c:594
ksys_write+0x120/0x210 fs/read_write.c:647
__do_sys_write fs/read_write.c:659 [inline]
__se_sys_write fs/read_write.c:656 [inline]
__arm64_sys_write+0x7c/0x90 fs/read_write.c:656
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Freed by task 6230:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4c/0x84 mm/kasan/common.c:46
kasan_set_free_info+0x28/0x4c mm/kasan/generic.c:360
____kasan_slab_free+0x118/0x164 mm/kasan/common.c:366
__kasan_slab_free+0x18/0x28 mm/kasan/common.c:374
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1705 [inline]
slab_free_freelist_hook+0x128/0x1e8 mm/slub.c:1731
slab_free mm/slub.c:3499 [inline]
kfree+0x170/0x40c mm/slub.c:4559
mgmt_pending_free+0xd0/0x12c net/bluetooth/mgmt_util.c:263
mgmt_pending_remove+0xec/0x104 net/bluetooth/mgmt_util.c:269
cmd_complete_rsp+0xcc/0x17c net/bluetooth/mgmt.c:-1
mgmt_pending_foreach+0xd4/0x148 net/bluetooth/mgmt_util.c:226
mgmt_index_removed+0x108/0x240 net/bluetooth/mgmt.c:8546
hci_sock_bind+0x844/0xc24 net/bluetooth/hci_sock.c:1246
__sys_bind+0x1dc/0x27c net/socket.c:1720
__do_sys_bind net/socket.c:1731 [inline]
__se_sys_bind net/socket.c:1729 [inline]
__arm64_sys_bind+0x7c/0x94 net/socket.c:1729
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
The buggy address belongs to the object at ffff0000ca486000
which belongs to the cache kmalloc-128 of size 128
The buggy address is located 8 bytes inside of
128-byte region [ffff0000ca486000, ffff0000ca486080)
The buggy address belongs to the page:
page:00000000ddec87b5 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10a486
flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000200 0000000000000000 0000000300000001 ffff0000c0002300
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff0000ca485f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff0000ca485f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000ca486000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff0000ca486080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff0000ca486100: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
Unable to handle kernel paging request at virtual address fb9380908000030a
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
CM = 0, WnR = 0
[fb9380908000030a] address between user and kernel address ranges
Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 6229 Comm: syz.6.414 Tainted: G B 5.15.185-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __list_del_entry_valid+0x78/0x150 lib/list_debug.c:59
lr : __list_del_entry_valid+0x4c/0x150 lib/list_debug.c:47
sp : ffff8000201177b0
x29: ffff8000201177b0 x28: ffff8000201177e0 x27: 1fffe00019490c05
x26: 1ffff00004022efc x25: dfff800000000000 x24: ffff0000e5e740b0
x23: 0000000000000005 x22: ffff0000e8347000 x21: dfff800000000000
x20: dca0048400001856 x19: ffff0000ca486000 x18: 0000000000000002
x17: 0000000040000000 x16: ffff8000082d4c48 x15: 0000000000000002
x14: 00000000ffff8000 x13: 683f609d583bbf00 x12: 0000000000080000
x11: 000000000007ffff x10: ffff800027e0c000 x9 : ffff80001ae153d0
x8 : 1b9400908000030a x7 : 0000000000000000 x6 : ffff80000824419c
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff80000a77f5b4
x2 : dead000000000122 x1 : 0000000000000008 x0 : 0000000000000000
Call trace:
__list_del_entry_valid+0x78/0x150 lib/list_debug.c:59
__list_del_entry include/linux/list.h:132 [inline]
list_del include/linux/list.h:146 [inline]
settings_rsp+0x10c/0x338 net/bluetooth/mgmt.c:1284
mgmt_pending_foreach+0xd4/0x148 net/bluetooth/mgmt_util.c:226
__mgmt_power_off+0xc4/0x2a8 net/bluetooth/mgmt.c:8624
hci_dev_do_close+0x4a0/0x105c net/bluetooth/hci_core.c:1791
hci_dev_close+0xc8/0x1b8 net/bluetooth/hci_core.c:1877
hci_sock_ioctl+0x474/0x94c net/bluetooth/hci_sock.c:1067
sock_do_ioctl+0xf8/0x240 net/socket.c:1140
sock_ioctl+0x5c8/0x87c net/socket.c:1257
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]
__arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Code: 91008902 eb02029f 54000520 d343fe88 (38756908)
---[ end trace 6399ff2ab69d1ad5 ]---
----------------
Code disassembly (best guess):
0: 91008902 add x2, x8, #0x22
4: eb02029f cmp x20, x2
8: 54000520 b.eq 0xac // b.none
c: d343fe88 lsr x8, x20, #3
* 10: 38756908 ldrb w8, [x8, x21] <-- trapping instruction