================================================================== BUG: KASAN: use-after-free in sk_psock_unlink+0x3dd/0x4b0 net/core/sock_map.c:993 Read of size 4 at addr ffff88808f9dc0d8 by task syz-executor.1/28125 CPU: 1 PID: 28125 Comm: syz-executor.1 Not tainted 5.2.0-rc4+ #33 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+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:188 __kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 kasan_report+0x12/0x20 mm/kasan/common.c:614 __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:131 sk_psock_unlink+0x3dd/0x4b0 net/core/sock_map.c:993 tcp_bpf_remove+0x21/0x50 net/ipv4/tcp_bpf.c:535 tcp_bpf_close+0x130/0x390 net/ipv4/tcp_bpf.c:575 tls_sk_proto_close+0x18a/0x770 net/tls/tls_main.c:313 inet_release+0xe0/0x1f0 net/ipv4/af_inet.c:427 inet6_release+0x53/0x80 net/ipv6/af_inet6.c:470 __sock_release+0xce/0x2a0 net/socket.c:601 sock_close+0x1b/0x30 net/socket.c:1273 __fput+0x2ff/0x890 fs/file_table.c:280 ____fput+0x16/0x20 fs/file_table.c:313 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:185 [inline] exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:168 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x58e/0x680 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x412f90 Code: 01 f0 ff ff 0f 83 30 1b 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d fd 32 66 00 00 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 RSP: 002b:00007ffe334d6818 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000412f90 RDX: 0000001b2da20000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffffffffffff R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000761178 R13: 0000000000000005 R14: 0000000000000000 R15: 000000000075bf2c Allocated by task 28125: save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_kmalloc mm/kasan/common.c:489 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:462 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:503 kmem_cache_alloc_trace+0x151/0x750 mm/slab.c:3555 kmalloc include/linux/slab.h:547 [inline] kzalloc include/linux/slab.h:742 [inline] sock_map_alloc net/core/sock_map.c:38 [inline] sock_map_alloc+0x1b9/0x3f0 net/core/sock_map.c:24 find_and_alloc_map kernel/bpf/syscall.c:121 [inline] map_create kernel/bpf/syscall.c:562 [inline] __do_sys_bpf+0x730/0x43d0 kernel/bpf/syscall.c:2787 __se_sys_bpf kernel/bpf/syscall.c:2764 [inline] __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:2764 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 9140: save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:451 kasan_slab_free+0xe/0x10 mm/kasan/common.c:459 __cache_free mm/slab.c:3432 [inline] kfree+0xcf/0x220 mm/slab.c:3755 sock_map_free+0x22a/0x310 net/core/sock_map.c:256 bpf_map_free_deferred+0xb4/0xe0 kernel/bpf/syscall.c:302 process_one_work+0x989/0x1790 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x354/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff88808f9dc0c0 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 24 bytes inside of 512-byte region [ffff88808f9dc0c0, ffff88808f9dc2c0) The buggy address belongs to the page: page:ffffea00023e7700 refcount:1 mapcount:0 mapping:ffff8880aa400940 index:0xffff88808f9dcd40 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea0002798188 ffffea00022bc548 ffff8880aa400940 raw: ffff88808f9dcd40 ffff88808f9dc0c0 0000000100000004 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808f9dbf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88808f9dc000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88808f9dc080: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff88808f9dc100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808f9dc180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================