================================================================== BUG: KASAN: use-after-free in debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline] BUG: KASAN: use-after-free in do_raw_spin_lock+0x1c0/0x200 kernel/locking/spinlock_debug.c:112 Read of size 4 at addr ffff8800a133c6f4 by task syz-executor.0/16893 CPU: 1 PID: 16893 Comm: syz-executor.0 Not tainted 4.19.0-rc6+ #1 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+0x109/0x15a 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_load4_noabort+0x14/0x20 mm/kasan/report.c:432 debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline] do_raw_spin_lock+0x1c0/0x200 kernel/locking/spinlock_debug.c:112 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:136 [inline] _raw_spin_lock_bh+0x39/0x40 kernel/locking/spinlock.c:168 spin_lock_bh include/linux/spinlock.h:334 [inline] psock_map_pop.isra.23+0x1f/0x1b0 kernel/bpf/sockmap.c:302 bpf_tcp_remove+0x435/0x960 kernel/bpf/sockmap.c:366 bpf_tcp_close+0xd2/0x280 kernel/bpf/sockmap.c:403 inet_release+0xd9/0x1c0 net/ipv4/af_inet.c:428 inet6_release+0x46/0x60 net/ipv6/af_inet6.c:458 __sock_release+0xc2/0x230 net/socket.c:579 sock_close+0x10/0x20 net/socket.c:1141 __fput+0x249/0x7f0 fs/file_table.c:278 ____fput+0x9/0x10 fs/file_table.c:309 task_work_run+0x108/0x180 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x1a9/0x200 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+0x407/0x4d0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x413501 Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 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:00007ffde70b7450 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000413501 RDX: 0000000000000000 RSI: 0000000000000081 RDI: 0000000000000005 RBP: 0000000000000000 R08: 00000000007613a0 R09: ffffffffffffffff R10: 00007ffde70b7520 R11: 0000000000000293 R12: 000000000075bfc8 R13: 0000000000000005 R14: 00000000007613a8 R15: ffffffffffffffff Allocated by task 16905: 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/0x730 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:1634 [inline] __sock_map_ctx_update_elem.isra.26+0x32c/0xcd0 kernel/bpf/sockmap.c:1938 sock_hash_ctx_update_elem.isra.30+0x63a/0x1040 kernel/bpf/sockmap.c:2409 sock_hash_update_elem+0x1b6/0x390 kernel/bpf/sockmap.c:2493 map_update_elem+0x591/0xb50 kernel/bpf/syscall.c:807 __do_sys_bpf kernel/bpf/syscall.c:2387 [inline] __se_sys_bpf kernel/bpf/syscall.c:2358 [inline] __x64_sys_bpf+0x208/0x380 kernel/bpf/syscall.c:2358 do_syscall_64+0xd0/0x4d0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 8881: 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/0x220 mm/slab.c:3813 smap_gc_work+0x775/0xa90 kernel/bpf/sockmap.c:1627 kobject: 'loop4' (00000000b8120fa7): fill_kobj_path: path = '/devices/virtual/block/loop4' process_one_work+0x830/0x15c0 kernel/workqueue.c:2153 worker_thread+0x85/0xb60 kernel/workqueue.c:2296 kthread+0x324/0x3e0 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:413 The buggy address belongs to the object at ffff8800a133c4c0 which belongs to the cache kmalloc-1024 of size 1024 The buggy address is located 564 bytes inside of 1024-byte region [ffff8800a133c4c0, ffff8800a133c8c0) The buggy address belongs to the page: page:ffffea000284cf00 count:1 mapcount:0 mapping:ffff88012c35cac0 index:0xffff8800a133d240 compound_mapcount: 0 flags: 0x1fffc0000008100(slab|head) raw: 01fffc0000008100 ffffea0002537d88 ffffea000252a988 ffff88012c35cac0 kobject: 'loop2' (00000000cfd0cfa3): kobject_uevent_env raw: ffff8800a133d240 ffff8800a133c040 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8800a133c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8800a133c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8800a133c680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb kobject: 'loop2' (00000000cfd0cfa3): fill_kobj_path: path = '/devices/virtual/block/loop2' ^ ffff8800a133c700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8800a133c780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================