================================================================== BUG: KASAN: use-after-free in __list_del_entry_valid+0xcc/0xf0 lib/list_debug.c:42 Read of size 8 at addr ffff88809f969588 by task syz-executor.2/14077 CPU: 1 PID: 14077 Comm: syz-executor.2 Not tainted 4.19.211-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+0x1fc/0x2ef lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433 __list_del_entry_valid+0xcc/0xf0 lib/list_debug.c:42 __list_del_entry include/linux/list.h:117 [inline] list_del_rcu include/linux/rculist.h:130 [inline] __nf_tables_abort+0x1fde/0x2ca0 net/netfilter/nf_tables_api.c:6660 nf_tables_abort+0x13/0x30 net/netfilter/nf_tables_api.c:6770 nfnetlink_rcv_batch+0xb66/0x1df0 net/netfilter/nfnetlink.c:496 nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:545 [inline] nfnetlink_rcv+0x3b5/0x420 net/netfilter/nfnetlink.c:563 netlink_unicast_kernel net/netlink/af_netlink.c:1325 [inline] netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1351 netlink_sendmsg+0x6c3/0xc50 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:661 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2227 __sys_sendmsg net/socket.c:2265 [inline] __do_sys_sendmsg net/socket.c:2274 [inline] __se_sys_sendmsg net/socket.c:2272 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2272 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f303fbd3049 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f303e548168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f303fce5f60 RCX: 00007f303fbd3049 RDX: 0000000000000000 RSI: 0000000020000280 RDI: 0000000000000004 RBP: 00007f303fc2d08d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffca53b133f R14: 00007f303e548300 R15: 0000000000022000 Allocated by task 14077: kmem_cache_alloc_trace+0x12f/0x380 mm/slab.c:3625 kmalloc include/linux/slab.h:515 [inline] kzalloc include/linux/slab.h:709 [inline] nf_tables_newtable+0xad9/0x1620 net/netfilter/nf_tables_api.c:883 nfnetlink_rcv_batch+0x10d5/0x1df0 net/netfilter/nfnetlink.c:435 nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:545 [inline] nfnetlink_rcv+0x3b5/0x420 net/netfilter/nfnetlink.c:563 netlink_unicast_kernel net/netlink/af_netlink.c:1325 [inline] netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1351 netlink_sendmsg+0x6c3/0xc50 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:661 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2227 __sys_sendmsg net/socket.c:2265 [inline] __do_sys_sendmsg net/socket.c:2274 [inline] __se_sys_sendmsg net/socket.c:2272 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2272 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 14093: __cache_free mm/slab.c:3503 [inline] kfree+0xcc/0x210 mm/slab.c:3822 nf_tables_table_destroy+0xee/0x130 net/netfilter/nf_tables_api.c:1062 nft_commit_release net/netfilter/nf_tables_api.c:6277 [inline] nf_tables_commit_release net/netfilter/nf_tables_api.c:6317 [inline] nf_tables_commit+0x2aba/0x57f0 net/netfilter/nf_tables_api.c:6607 nfnetlink_rcv_batch+0xe22/0x1df0 net/netfilter/nfnetlink.c:487 nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:545 [inline] nfnetlink_rcv+0x3b5/0x420 net/netfilter/nfnetlink.c:563 netlink_unicast_kernel net/netlink/af_netlink.c:1325 [inline] netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1351 netlink_sendmsg+0x6c3/0xc50 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:661 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2227 __sys_sendmsg net/socket.c:2265 [inline] __do_sys_sendmsg net/socket.c:2274 [inline] __se_sys_sendmsg net/socket.c:2272 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2272 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88809f969580 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of 512-byte region [ffff88809f969580, ffff88809f969780) The buggy address belongs to the page: page:ffffea00027e5a40 count:1 mapcount:0 mapping:ffff88813bff0940 index:0x0 flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffffea00028bbbc8 ffffea0002bc58c8 ffff88813bff0940 raw: 0000000000000000 ffff88809f969080 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809f969480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809f969500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88809f969580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809f969600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809f969680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== IPVS: set_ctl: invalid protocol: 60 10.1.1.2:20000