syzbot


KASAN: null-ptr-deref Write in l2cap_sock_suspend_cb

Status: auto-obsoleted due to no activity on 2023/12/23 09:03
Subsystems: bluetooth
[Documentation on labels]
Reported-by: syzbot+df5cbce32ac8cdb9c7fa@syzkaller.appspotmail.com
First crash: 254d, last: 254d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [bluetooth?] KASAN: null-ptr-deref Write in l2cap_sock_suspend_cb 0 (1) 2023/09/20 23:03

Sample crash report:
==================================================================
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+0x43/0x90 net/bluetooth/l2cap_sock.c:1698
Write of size 8 at addr 0000000000000528 by task kworker/3:4/5228

CPU: 3 PID: 5228 Comm: kworker/3:4 Not tainted 6.6.0-rc1-syzkaller-00070-g23f108dc9ed2 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: events l2cap_info_timeout
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 kasan_report+0xda/0x110 mm/kasan/report.c:588
 check_region_inline mm/kasan/generic.c:181 [inline]
 kasan_check_range+0xef/0x190 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+0x43/0x90 net/bluetooth/l2cap_sock.c:1698
 l2cap_chan_ready.part.0+0x1bc/0x230 net/bluetooth/l2cap_core.c:1376
 l2cap_chan_ready net/bluetooth/l2cap_core.c:1365 [inline]
 l2cap_conn_start+0x15c/0xa40 net/bluetooth/l2cap_core.c:1640
 process_one_work+0x887/0x15d0 kernel/workqueue.c:2630
 process_scheduled_works kernel/workqueue.c:2703 [inline]
 worker_thread+0x8bb/0x1290 kernel/workqueue.c:2784
 kthread+0x33a/0x430 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>
==================================================================
Kernel panic - not syncing: KASAN: panic_on_warn set ...
CPU: 3 PID: 5228 Comm: kworker/3:4 Not tainted 6.6.0-rc1-syzkaller-00070-g23f108dc9ed2 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: events l2cap_info_timeout
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 panic+0x6a6/0x750 kernel/panic.c:340
 check_panic_on_warn+0xab/0xb0 kernel/panic.c:236
 end_report+0x108/0x150 mm/kasan/report.c:225
 kasan_report+0xea/0x110 mm/kasan/report.c:590
 check_region_inline mm/kasan/generic.c:181 [inline]
 kasan_check_range+0xef/0x190 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+0x43/0x90 net/bluetooth/l2cap_sock.c:1698
 l2cap_chan_ready.part.0+0x1bc/0x230 net/bluetooth/l2cap_core.c:1376
 l2cap_chan_ready net/bluetooth/l2cap_core.c:1365 [inline]
 l2cap_conn_start+0x15c/0xa40 net/bluetooth/l2cap_core.c:1640
 process_one_work+0x887/0x15d0 kernel/workqueue.c:2630
 process_scheduled_works kernel/workqueue.c:2703 [inline]
 worker_thread+0x8bb/0x1290 kernel/workqueue.c:2784
 kthread+0x33a/0x430 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>
Kernel Offset: disabled

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/09/14 09:02 upstream 23f108dc9ed2 0b6a67ac .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: null-ptr-deref Write in l2cap_sock_suspend_cb
* Struck through repros no longer work on HEAD.