================================================================== BUG: KASAN: use-after-free in perf_trace_lock_acquire+0x400/0x550 include/trace/events/lock.h:13 Read of size 8 at addr ffff88801d77a138 by task kworker/1:4/8309 CPU: 1 PID: 8309 Comm: kworker/1:4 Not tainted 5.15.0-rc6-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:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x6c/0x2d6 mm/kasan/report.c:256 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 perf_trace_lock_acquire+0x400/0x550 include/trace/events/lock.h:13 trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x416/0x510 kernel/locking/lockdep.c:5596 lock_sock_nested+0x2f/0xf0 net/core/sock.c:3203 l2cap_sock_teardown_cb+0xa1/0x660 net/bluetooth/l2cap_sock.c:1528 l2cap_chan_del+0xbc/0xa80 net/bluetooth/l2cap_core.c:622 l2cap_chan_close+0x1b9/0xaf0 net/bluetooth/l2cap_core.c:825 l2cap_chan_timeout+0x17e/0x2f0 net/bluetooth/l2cap_core.c:436 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 18449: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 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 mm/kasan/common.c:472 [inline] __kasan_kmalloc+0xa1/0xd0 mm/kasan/common.c:522 kasan_kmalloc include/linux/kasan.h:264 [inline] __do_kmalloc mm/slab.c:3702 [inline] __kmalloc+0x214/0x4d0 mm/slab.c:3711 kmalloc include/linux/slab.h:596 [inline] sk_prot_alloc+0x110/0x290 net/core/sock.c:1839 sk_alloc+0x30/0xa60 net/core/sock.c:1892 __netlink_create+0x63/0x2f0 net/netlink/af_netlink.c:643 netlink_create+0x3ad/0x5e0 net/netlink/af_netlink.c:706 __sock_create+0x353/0x790 net/socket.c:1464 sock_create net/socket.c:1515 [inline] __sys_socket+0xef/0x200 net/socket.c:1557 __do_sys_socket net/socket.c:1566 [inline] __se_sys_socket net/socket.c:1564 [inline] __x64_sys_socket+0x6f/0xb0 net/socket.c:1564 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xa7/0xd0 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:2987 [inline] call_rcu+0xb1/0x750 kernel/rcu/tree.c:3067 netlink_release+0xdd4/0x1dd0 net/netlink/af_netlink.c:815 __sock_release+0xcd/0x280 net/socket.c:649 sock_close+0x18/0x20 net/socket.c:1314 __fput+0x288/0x9f0 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 get_signal+0x1b84/0x21d0 kernel/signal.c:2628 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff88801d77a000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 312 bytes inside of 2048-byte region [ffff88801d77a000, ffff88801d77a800) The buggy address belongs to the page: page:ffffea000075de80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1d77a flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0002392048 ffffea000237e348 ffff888010c40800 raw: 0000000000000000 ffff88801d77a000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2c20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_THISNODE), pid 17382, ts 580286223893, free_ts 577252078210 prep_new_page mm/page_alloc.c:2424 [inline] get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4153 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5375 __alloc_pages_node include/linux/gfp.h:570 [inline] kmem_getpages mm/slab.c:1377 [inline] cache_grow_begin+0x75/0x460 mm/slab.c:2593 cache_alloc_refill+0x27f/0x380 mm/slab.c:2965 ____cache_alloc mm/slab.c:3048 [inline] ____cache_alloc mm/slab.c:3031 [inline] slab_alloc_node mm/slab.c:3249 [inline] kmem_cache_alloc_node_trace+0x4ca/0x5d0 mm/slab.c:3617 __do_kmalloc_node mm/slab.c:3639 [inline] __kmalloc_node_track_caller+0x38/0x60 mm/slab.c:3654 kmalloc_reserve net/core/skbuff.c:355 [inline] __alloc_skb+0xde/0x340 net/core/skbuff.c:426 alloc_skb include/linux/skbuff.h:1116 [inline] alloc_skb_with_frags+0x93/0x620 net/core/skbuff.c:6073 sock_alloc_send_pskb+0x783/0x910 net/core/sock.c:2493 mld_newpack+0x1df/0x770 net/ipv6/mcast.c:1754 add_grhead+0x265/0x330 net/ipv6/mcast.c:1857 add_grec+0x1053/0x14e0 net/ipv6/mcast.c:1995 mld_send_cr net/ipv6/mcast.c:2121 [inline] mld_ifc_work+0x452/0xdc0 net/ipv6/mcast.c:2659 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1338 [inline] free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1389 free_unref_page_prepare mm/page_alloc.c:3315 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3394 __vunmap+0x783/0xb70 mm/vmalloc.c:2621 __vfree+0x3c/0xd0 mm/vmalloc.c:2669 vfree+0x5a/0x90 mm/vmalloc.c:2700 snd_dma_free_pages+0xb6/0x110 sound/core/memalloc.c:121 do_free_pages.part.0+0xc4/0x190 sound/core/pcm_memory.c:60 do_free_pages sound/core/pcm_memory.c:446 [inline] snd_pcm_lib_free_pages+0x139/0x300 sound/core/pcm_memory.c:456 do_hw_free sound/core/pcm_native.c:831 [inline] snd_pcm_release_substream.part.0+0x2c6/0x360 sound/core/pcm_native.c:2641 snd_pcm_release_substream+0x57/0x70 sound/core/pcm_native.c:2635 snd_pcm_oss_release_file sound/core/oss/pcm_oss.c:2394 [inline] snd_pcm_oss_release_file sound/core/oss/pcm_oss.c:2386 [inline] snd_pcm_oss_release+0x171/0x300 sound/core/oss/pcm_oss.c:2573 __fput+0x288/0x9f0 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 Memory state around the buggy address: ffff88801d77a000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801d77a080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801d77a100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801d77a180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801d77a200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================