================================================================== BUG: KASAN: use-after-free in sk_psock_unlink+0x321/0x410 net/core/sock_map.c:997 Read of size 4 at addr ffff8880891fdd58 by task syz-executor.3/1038 CPU: 0 PID: 1038 Comm: syz-executor.3 Not tainted 5.3.0-rc6-syzkaller #0 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+0x113/0x167 lib/dump_stack.c:113 print_address_description.cold.8+0x9/0x318 mm/kasan/report.c:351 __kasan_report.cold.9+0x1b/0x3f mm/kasan/report.c:482 kasan_report+0x12/0x17 mm/kasan/common.c:618 __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:131 sk_psock_unlink+0x321/0x410 net/core/sock_map.c:997 tcp_bpf_remove+0x1c/0x40 net/ipv4/tcp_bpf.c:539 tcp_bpf_close+0xd2/0x280 net/ipv4/tcp_bpf.c:579 inet_release+0xc1/0x1c0 net/ipv4/af_inet.c:427 inet6_release+0x46/0x60 net/ipv6/af_inet6.c:470 __sock_release+0xc2/0x270 net/socket.c:590 sock_close+0x13/0x20 net/socket.c:1268 __fput+0x25a/0x770 fs/file_table.c:280 ____fput+0x9/0x10 fs/file_table.c:313 task_work_run+0x108/0x180 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x24e/0x2e0 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] syscall_return_slowpath arch/x86/entry/common.c:274 [inline] do_syscall_64+0x462/0x540 arch/x86/entry/common.c:299 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x415fe1 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:00007ffcc59c4700 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000415fe1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000001 R08: 00ffffffffffffff R09: 00ffffffffffffff R10: 00007ffcc59c47e0 R11: 0000000000000293 R12: 000000000076bf20 R13: 0000000000771120 R14: 00000000000671b6 R15: 000000000076bf2c Allocated by task 1040: save_stack+0x21/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc.constprop.13+0xc7/0xd0 mm/kasan/common.c:493 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:507 kmem_cache_alloc_trace+0x15b/0x780 mm/slab.c:3550 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:748 [inline] sock_hash_alloc+0x170/0x4e0 net/core/sock_map.c:806 find_and_alloc_map kernel/bpf/syscall.c:121 [inline] map_create kernel/bpf/syscall.c:569 [inline] __do_sys_bpf+0x337/0x33c0 kernel/bpf/syscall.c:2831 __se_sys_bpf kernel/bpf/syscall.c:2808 [inline] __x64_sys_bpf+0x6e/0xb0 kernel/bpf/syscall.c:2808 do_syscall_64+0xd0/0x540 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 8289: save_stack+0x21/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:455 kasan_slab_free+0xe/0x10 mm/kasan/common.c:463 __cache_free mm/slab.c:3425 [inline] kfree+0x108/0x2c0 mm/slab.c:3756 sock_hash_free+0x2f1/0x4e0 net/core/sock_map.c:869 bpf_map_free_deferred+0xaf/0x100 kernel/bpf/syscall.c:307 process_one_work+0x856/0x1630 kernel/workqueue.c:2269 worker_thread+0x85/0xb60 kernel/workqueue.c:2415 kthread+0x331/0x3f0 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff8880891fdd40 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 24 bytes inside of 512-byte region [ffff8880891fdd40, ffff8880891fdf40) The buggy address belongs to the page: page:ffffea0002247f40 refcount:1 mapcount:0 mapping:ffff8880aa400a80 index:0xffff8880891fd840 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea00024d5248 ffffea0002924a08 ffff8880aa400a80 raw: ffff8880891fd840 ffff8880891fd0c0 0000000100000005 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880891fdc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880891fdc80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8880891fdd00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff8880891fdd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880891fde00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================