================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x2c57/0x3f20 kernel/locking/lockdep.c:3369 Read of size 8 at addr ffff8880646cd4a0 by task kworker/0:4/9086 CPU: 0 PID: 9086 Comm: kworker/0:4 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 __lock_acquire+0x2c57/0x3f20 kernel/locking/lockdep.c:3369 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __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 11062: 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 include/linux/slab.h:493 [inline] kzalloc include/linux/slab.h:661 [inline] alloc_ts_config include/linux/textsearch.h:167 [inline] bm_init+0x3c/0x840 lib/ts_bm.c:154 textsearch_prepare lib/textsearch.c:287 [inline] textsearch_prepare+0x1c8/0x600 lib/textsearch.c:261 string_mt_check+0x188/0x230 net/netfilter/xt_string.c:58 xt_check_match+0x231/0x4c0 net/netfilter/x_tables.c:503 check_match net/ipv6/netfilter/ip6_tables.c:502 [inline] find_check_match net/ipv6/netfilter/ip6_tables.c:519 [inline] find_check_entry.constprop.0+0x2f1/0x950 net/ipv6/netfilter/ip6_tables.c:571 translate_table+0xb2d/0x14a0 net/ipv6/netfilter/ip6_tables.c:755 do_replace net/ipv6/netfilter/ip6_tables.c:1157 [inline] do_ip6t_set_ctl+0x228/0x3b0 net/ipv6/netfilter/ip6_tables.c:1687 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x5f/0xb0 net/netfilter/nf_sockopt.c:115 ipv6_setsockopt+0xc0/0x120 net/ipv6/ipv6_sockglue.c:937 tcp_setsockopt+0x7b/0xc0 net/ipv4/tcp.c:2828 SYSC_setsockopt net/socket.c:1865 [inline] SyS_setsockopt+0x110/0x1e0 net/socket.c:1844 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 11062: 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 cleanup_match net/ipv6/netfilter/ip6_tables.c:491 [inline] find_check_entry.constprop.0+0x462/0x950 net/ipv6/netfilter/ip6_tables.c:596 translate_table+0xb2d/0x14a0 net/ipv6/netfilter/ip6_tables.c:755 do_replace net/ipv6/netfilter/ip6_tables.c:1157 [inline] do_ip6t_set_ctl+0x228/0x3b0 net/ipv6/netfilter/ip6_tables.c:1687 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x5f/0xb0 net/netfilter/nf_sockopt.c:115 ipv6_setsockopt+0xc0/0x120 net/ipv6/ipv6_sockglue.c:937 tcp_setsockopt+0x7b/0xc0 net/ipv4/tcp.c:2828 SYSC_setsockopt net/socket.c:1865 [inline] SyS_setsockopt+0x110/0x1e0 net/socket.c:1844 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb The buggy address belongs to the object at ffff8880646cd400 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 160 bytes inside of 2048-byte region [ffff8880646cd400, ffff8880646cdc00) The buggy address belongs to the page: page:ffffea000191b300 count:1 mapcount:0 mapping:ffff8880646cc300 index:0xffff8880646ccb80 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffff8880646cc300 ffff8880646ccb80 0000000100000001 raw: ffffea00019000a0 ffffea0002b1e3a0 ffff88813fe80c40 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880646cd380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880646cd400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880646cd480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880646cd500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880646cd580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================