================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x37c2/0x4ec0 kernel/locking/lockdep.c:3291 Read of size 8 at addr ffff8801b8acf008 by task syz-executor2/8707 CPU: 1 PID: 8707 Comm: syz-executor2 Not tainted 4.19.0-rc2+ #100 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c4/0x2b4 lib/dump_stack.c:113 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 __lock_acquire+0x37c2/0x4ec0 kernel/locking/lockdep.c:3291 lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3901 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:168 spin_lock_bh include/linux/spinlock.h:334 [inline] psock_map_pop.isra.22+0x93/0x3b0 kernel/bpf/sockmap.c:298 bpf_tcp_close+0x6ca/0x10c0 kernel/bpf/sockmap.c:380 inet_release+0x104/0x1f0 net/ipv4/af_inet.c:428 inet6_release+0x50/0x70 net/ipv6/af_inet6.c:457 __sock_release+0xd7/0x250 net/socket.c:579 sock_close+0x19/0x20 net/socket.c:1139 __fput+0x385/0xa30 fs/file_table.c:278 ____fput+0x15/0x20 fs/file_table.c:309 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x411151 Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 19 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffd4f0d03b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000411151 RDX: 0000000000000000 RSI: 00000000007309b0 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffffffffffff R10: 000000000072bf00 R11: 0000000000000293 R12: 0000000000000006 R13: 000000000002118c R14: 0000000000000038 R15: badc0ffeebadface Allocated by task 8710: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 kmem_cache_alloc_node_trace+0x14c/0x740 mm/slab.c:3663 kmalloc_node include/linux/slab.h:551 [inline] kzalloc_node include/linux/slab.h:718 [inline] smap_init_psock kernel/bpf/sockmap.c:1612 [inline] __sock_map_ctx_update_elem.isra.23+0x7a9/0x12f0 kernel/bpf/sockmap.c:1916 sock_map_ctx_update_elem.isra.24+0x1a3/0xbe0 kernel/bpf/sockmap.c:1981 sock_map_update_elem+0x22a/0x5a0 kernel/bpf/sockmap.c:2107 map_update_elem+0x753/0xd50 kernel/bpf/syscall.c:798 __do_sys_bpf kernel/bpf/syscall.c:2370 [inline] __se_sys_bpf kernel/bpf/syscall.c:2341 [inline] __x64_sys_bpf+0x32d/0x510 kernel/bpf/syscall.c:2341 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 5740: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3813 smap_gc_work+0x910/0xc70 kernel/bpf/sockmap.c:1605 process_one_work+0xc90/0x1b90 kernel/workqueue.c:2153 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296 kthread+0x35a/0x420 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413 The buggy address belongs to the object at ffff8801b8acedc0 which belongs to the cache kmalloc-1024 of size 1024 The buggy address is located 584 bytes inside of 1024-byte region [ffff8801b8acedc0, ffff8801b8acf1c0) The buggy address belongs to the page: page:ffffea0006e2b380 count:1 mapcount:0 mapping:ffff8801da800ac0 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffffea00073a3f08 ffffea00072ea408 ffff8801da800ac0 raw: 0000000000000000 ffff8801b8ace040 0000000100000007 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801b8acef00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801b8acef80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801b8acf000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801b8acf080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801b8acf100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================