================================================================== BUG: KASAN: use-after-free in trace_event_get_offsets_lock_acquire include/trace/events/lock.h:13 [inline] BUG: KASAN: use-after-free in perf_trace_lock_acquire+0x3f3/0x510 include/trace/events/lock.h:13 Read of size 8 at addr ffff888043b8a378 by task kworker/0:3/8617 CPU: 0 PID: 8617 Comm: kworker/0:3 Not tainted 4.14.232-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events l2cap_chan_timeout Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351 kasan_report mm/kasan/report.c:409 [inline] __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430 trace_event_get_offsets_lock_acquire include/trace/events/lock.h:13 [inline] perf_trace_lock_acquire+0x3f3/0x510 include/trace/events/lock.h:13 trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x2b8/0x3f0 kernel/locking/lockdep.c:3997 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:176 spin_lock_bh include/linux/spinlock.h:322 [inline] lock_sock_nested+0x39/0x100 net/core/sock.c:2788 l2cap_sock_teardown_cb+0x93/0x650 net/bluetooth/l2cap_sock.c:1341 l2cap_chan_del+0xaf/0x950 net/bluetooth/l2cap_core.c:599 l2cap_chan_close+0x103/0x870 net/bluetooth/l2cap_core.c:757 l2cap_chan_timeout+0x143/0x2a0 net/bluetooth/l2cap_core.c:430 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Allocated by task 18764: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 __do_kmalloc mm/slab.c:3720 [inline] __kmalloc+0x15a/0x400 mm/slab.c:3729 kmalloc_array include/linux/slab.h:607 [inline] kcalloc include/linux/slab.h:618 [inline] snd_pcm_hw_rule_add+0x34e/0x600 sound/core/pcm_lib.c:1139 snd_pcm_hw_constraints_init+0x6ac/0xad0 sound/core/pcm_native.c:2262 snd_pcm_open_substream+0x107/0x3b0 sound/core/pcm_native.c:2413 snd_pcm_open_file sound/core/pcm_native.c:2447 [inline] snd_pcm_open.part.0+0x1d8/0x5b0 sound/core/pcm_native.c:2514 snd_pcm_open sound/core/pcm_native.c:2504 [inline] snd_pcm_playback_open sound/core/pcm_native.c:2474 [inline] snd_pcm_playback_open+0xb7/0x120 sound/core/pcm_native.c:2466 snd_open+0x1f7/0x3e0 sound/core/sound.c:175 chrdev_open+0x23c/0x6d0 fs/char_dev.c:423 do_dentry_open+0x44b/0xec0 fs/open.c:777 vfs_open+0x105/0x220 fs/open.c:888 do_last fs/namei.c:3428 [inline] path_openat+0x628/0x2970 fs/namei.c:3569 do_filp_open+0x179/0x3c0 fs/namei.c:3603 do_sys_open+0x296/0x410 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 18759: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xc9/0x250 mm/slab.c:3815 snd_pcm_detach_substream+0x12e/0x370 sound/core/pcm.c:1055 snd_pcm_release_substream sound/core/pcm_native.c:2377 [inline] snd_pcm_release+0xe0/0x1f0 sound/core/pcm_native.c:2563 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb The buggy address belongs to the object at ffff888043b8a2c0 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 184 bytes inside of 2048-byte region [ffff888043b8a2c0, ffff888043b8aac0) The buggy address belongs to the page: page:ffffea00010ee280 count:1 mapcount:0 mapping:ffff888043b8a2c0 index:0x0 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffff888043b8a2c0 0000000000000000 0000000100000003 raw: ffffea00014252a0 ffffea0002b02220 ffff88813fe80c40 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888043b8a200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888043b8a280: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb >ffff888043b8a300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888043b8a380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888043b8a400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================