KASAN: null-ptr-deref Write in l2cap_sock_suspend

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KASAN: null-ptr-deref Write in l2cap_sock_suspend_cb bluetooth	12				1	674d	667d	0/29	auto-obsoleted due to no activity on 2023/12/23 09:03

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BUG: KASAN: null-ptr-deref in instrument_atomic_write include/linux/instrumented.h:82 [inline]
BUG: KASAN: null-ptr-deref in set_bit include/asm-generic/bitops/instrumented-atomic.h:28 [inline]
BUG: KASAN: null-ptr-deref in l2cap_sock_suspend_cb+0x4c/0x80 net/bluetooth/l2cap_sock.c:1726
Write of size 8 at addr 0000000000000528 by task kworker/u5:3/15776

CPU: 1 PID: 15776 Comm: kworker/u5:3 Not tainted 6.6.95-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: hci2 hci_rx_work
Call Trace:
 <TASK>
 dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
 kasan_report+0x117/0x150 mm/kasan/report.c:588
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x288/0x290 mm/kasan/generic.c:187
 instrument_atomic_write include/linux/instrumented.h:82 [inline]
 set_bit include/asm-generic/bitops/instrumented-atomic.h:28 [inline]
 l2cap_sock_suspend_cb+0x4c/0x80 net/bluetooth/l2cap_sock.c:1726
 l2cap_chan_ready net/bluetooth/l2cap_core.c:1257 [inline]
 l2cap_le_start+0xa9d/0x1370 net/bluetooth/l2cap_core.c:1375
 l2cap_conn_ready net/bluetooth/l2cap_core.c:1628 [inline]
 l2cap_connect_cfm+0x6b9/0x1030 net/bluetooth/l2cap_core.c:7252
 hci_connect_cfm+0x8f/0x130 include/net/bluetooth/hci_core.h:1968
 le_conn_complete_evt+0xcd0/0x1220 net/bluetooth/hci_event.c:5772
 hci_le_conn_complete_evt+0x187/0x440 net/bluetooth/hci_event.c:5798
 hci_event_func net/bluetooth/hci_event.c:7433 [inline]
 hci_event_packet+0x795/0x1210 net/bluetooth/hci_event.c:7488
 hci_rx_work+0x43a/0xd80 net/bluetooth/hci_core.c:3992
 process_one_work kernel/workqueue.c:2634 [inline]
 process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
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